<informationTable xmlns="http://www.sec.gov/edgar/document/thirteenf/informationtable">		<infoTable>
			<nameOfIssuer>8POINT3 ENERGY PARTNERS LP</nameOfIssuer>
			<titleOfClass>CL A RPT LTDPT</titleOfClass>
			<cusip>282539105</cusip>
			<value>4</value>
			<shrsOrPrnAmt>
				<sshPrnamt>274</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>274</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ACUITY BRANDS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>00508Y102</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>8</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>8</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ALPS ETF TR</nameOfIssuer>
			<titleOfClass>C&amp;S GLOBL ETF</titleOfClass>
			<cusip>00162Q866</cusip>
			<value>11668</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1204835</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>968268</Sole>
				<Shared>0</Shared>
				<None>236567</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>AMERICAN WTR WKS CO INC NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>030420103</cusip>
			<value>6</value>
			<shrsOrPrnAmt>
				<sshPrnamt>98</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>98</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ANADARKO PETE CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>032511107</cusip>
			<value>21499</value>
			<shrsOrPrnAmt>
				<sshPrnamt>442549</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>442549</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ANADARKO PETE CORP</nameOfIssuer>
			<titleOfClass>UNIT 99/99/9999</titleOfClass>
			<cusip>032511404</cusip>
			<value>23531</value>
			<shrsOrPrnAmt>
				<sshPrnamt>693100</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>693100</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ANTERO MIDSTREAM PARTNERS LP</nameOfIssuer>
			<titleOfClass>UNT LTD PARTN</titleOfClass>
			<cusip>03673L103</cusip>
			<value>210419</value>
			<shrsOrPrnAmt>
				<sshPrnamt>9944451</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>9220806</Sole>
				<Shared>0</Shared>
				<None>723645</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ANTERO RES CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>03674X106</cusip>
			<value>3829</value>
			<shrsOrPrnAmt>
				<sshPrnamt>175644</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>175644</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>APACHE CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>037411105</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>42</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>42</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>AQUA AMERICA INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>03836W103</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>38</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>38</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ARCHROCK INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>03957W106</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>57</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>57</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ASPEN AEROGELS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>04523Y105</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>57</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>57</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ATWOOD OCEANICS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>050095108</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>23</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>23</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BADGER METER INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>056525108</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>18</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>18</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BAKER HUGHES INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>057224107</cusip>
			<value>4</value>
			<shrsOrPrnAmt>
				<sshPrnamt>79</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>79</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BP PLC</nameOfIssuer>
			<titleOfClass>SPONSORED ADR</titleOfClass>
			<cusip>055622104</cusip>
			<value>3013</value>
			<shrsOrPrnAmt>
				<sshPrnamt>96400</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>96400</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>BUCKEYE PARTNERS L P</nameOfIssuer>
			<titleOfClass>UNIT LTD PARTN</titleOfClass>
			<cusip>118230101</cusip>
			<value>755492</value>
			<shrsOrPrnAmt>
				<sshPrnamt>12526705</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>11453787</Sole>
				<Shared>0</Shared>
				<None>1072918</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>C&amp;J ENERGY SVCS LTD</nameOfIssuer>
			<titleOfClass>SHS</titleOfClass>
			<cusip>G3164Q101</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>89</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>89</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CABOT OIL &amp; GAS CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>127097103</cusip>
			<value>5773</value>
			<shrsOrPrnAmt>
				<sshPrnamt>326329</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>326329</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CALPINE CORP</nameOfIssuer>
			<titleOfClass>COM NEW</titleOfClass>
			<cusip>131347304</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>79</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>79</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CAMERON INTERNATIONAL CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>13342B105</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>21</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>21</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CARRIZO OIL &amp; GAS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>144577103</cusip>
			<value>6602</value>
			<shrsOrPrnAmt>
				<sshPrnamt>223206</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>223206</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CENOVUS ENERGY INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>15135U109</cusip>
			<value>1933</value>
			<shrsOrPrnAmt>
				<sshPrnamt>153200</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>153200</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CENTERPOINT ENERGY INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>15189T107</cusip>
			<value>180</value>
			<shrsOrPrnAmt>
				<sshPrnamt>9828</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>9828</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CHART INDS INC</nameOfIssuer>
			<titleOfClass>COM PAR $0.01</titleOfClass>
			<cusip>16115Q308</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>7</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>7</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CHENIERE ENERGY INC</nameOfIssuer>
			<titleOfClass>COM NEW</titleOfClass>
			<cusip>16411R208</cusip>
			<value>46419</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1246138</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>1246138</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CHEVRON CORP NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>166764100</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>18</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>18</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CIMAREX ENERGY CO</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>171798101</cusip>
			<value>9085</value>
			<shrsOrPrnAmt>
				<sshPrnamt>101646</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>101646</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CMS ENERGY CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>125896100</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>49</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>49</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>COLUMBIA PIPELINE GROUP INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>198280109</cusip>
			<value>85502</value>
			<shrsOrPrnAmt>
				<sshPrnamt>4275109</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>4275109</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>COLUMBIA PIPELINE PARTNERS L</nameOfIssuer>
			<titleOfClass>COM UT REPSTG</titleOfClass>
			<cusip>198281107</cusip>
			<value>144871</value>
			<shrsOrPrnAmt>
				<sshPrnamt>9004055</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>8287794</Sole>
				<Shared>0</Shared>
				<None>716261</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CONCHO RES INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>20605P101</cusip>
			<value>12078</value>
			<shrsOrPrnAmt>
				<sshPrnamt>130063</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>130063</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CONNECTICUT WTR SVC INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>207797101</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>22</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>22</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CONOCOPHILLIPS</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>20825C104</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>28</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>28</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CONTINENTAL RESOURCES INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>212015101</cusip>
			<value>2226</value>
			<shrsOrPrnAmt>
				<sshPrnamt>96871</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>96871</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>CORE LABORATORIES N V</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>N22717107</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>10</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>10</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DANAHER CORP DEL</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>235851102</cusip>
			<value>6</value>
			<shrsOrPrnAmt>
				<sshPrnamt>62</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>62</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DCP MIDSTREAM PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UT LTD PTN</titleOfClass>
			<cusip>23311P100</cusip>
			<value>118379</value>
			<shrsOrPrnAmt>
				<sshPrnamt>5168489</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>4798510</Sole>
				<Shared>0</Shared>
				<None>369979</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DEVON ENERGY CORP NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>25179M103</cusip>
			<value>10328</value>
			<shrsOrPrnAmt>
				<sshPrnamt>322765</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>322765</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DHT HOLDINGS INC</nameOfIssuer>
			<titleOfClass>SHS NEW</titleOfClass>
			<cusip>Y2065G121</cusip>
			<value>248</value>
			<shrsOrPrnAmt>
				<sshPrnamt>30688</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>30688</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DIAMONDBACK ENERGY INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>25278X109</cusip>
			<value>5978</value>
			<shrsOrPrnAmt>
				<sshPrnamt>89360</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>89360</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DOMINION MIDSTREAM PARTNERS</nameOfIssuer>
			<titleOfClass>COM UT REP LTD</titleOfClass>
			<cusip>257454108</cusip>
			<value>79761</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2788028</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>2601477</Sole>
				<Shared>0</Shared>
				<None>186551</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DOMINION RES INC VA NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>25746U109</cusip>
			<value>7</value>
			<shrsOrPrnAmt>
				<sshPrnamt>98</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>98</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DORIAN LPG LTD</nameOfIssuer>
			<titleOfClass>SHS USD</titleOfClass>
			<cusip>Y2106R110</cusip>
			<value>1218</value>
			<shrsOrPrnAmt>
				<sshPrnamt>103460</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>103460</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DRIL-QUIP INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>262037104</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>12</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>12</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>DTE ENERGY CO</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>233331107</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>29</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>29</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>EASTMAN CHEM CO</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>277432100</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>17</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>17</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ECOLAB INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>278865100</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>19</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>19</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>EDISON INTL</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>281020107</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>31</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>31</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ENBRIDGE ENERGY MANAGEMENT L</nameOfIssuer>
			<titleOfClass>SHS UNITS LLI</titleOfClass>
			<cusip>29250X103</cusip>
			<value>32692</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1464035</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>1464035</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ENBRIDGE ENERGY PARTNERS L P</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>29250R106</cusip>
			<value>267243</value>
			<shrsOrPrnAmt>
				<sshPrnamt>12520305</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>11584018</Sole>
				<Shared>0</Shared>
				<None>936287</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ENBRIDGE INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>29250N105</cusip>
			<value>100369</value>
			<shrsOrPrnAmt>
				<sshPrnamt>3024070</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>3024070</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ENERGY TRANSFER EQUITY L P</nameOfIssuer>
			<titleOfClass>COM UT LTD PTN</titleOfClass>
			<cusip>29273V100</cusip>
			<value>357340</value>
			<shrsOrPrnAmt>
				<sshPrnamt>29398321</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>26007276</Sole>
				<Shared>0</Shared>
				<None>3391045</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ENERGY TRANSFER PRTNRS L P</nameOfIssuer>
			<titleOfClass>UNIT LTD PARTN</titleOfClass>
			<cusip>29273R109</cusip>
			<value>268603</value>
			<shrsOrPrnAmt>
				<sshPrnamt>7963323</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>7963323</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ENLINK MIDSTREAM LLC</nameOfIssuer>
			<titleOfClass>COM UNIT REP LTD</titleOfClass>
			<cusip>29336T100</cusip>
			<value>74339</value>
			<shrsOrPrnAmt>
				<sshPrnamt>5448330</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>4926374</Sole>
				<Shared>0</Shared>
				<None>521956</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ENLINK MIDSTREAM PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UNIT REP LTD</titleOfClass>
			<cusip>29336U107</cusip>
			<value>109579</value>
			<shrsOrPrnAmt>
				<sshPrnamt>6609082</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>6609082</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ENSCO PLC</nameOfIssuer>
			<titleOfClass>SHS CLASS A</titleOfClass>
			<cusip>G3157S106</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>28</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>28</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ENTERPRISE PRODS PARTNERS L</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>293792107</cusip>
			<value>957199</value>
			<shrsOrPrnAmt>
				<sshPrnamt>41011262</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>37419823</Sole>
				<Shared>0</Shared>
				<None>3591439</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>EOG RES INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>26875P101</cusip>
			<value>32597</value>
			<shrsOrPrnAmt>
				<sshPrnamt>460479</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>460479</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>EP ENERGY CORP</nameOfIssuer>
			<titleOfClass>CL A</titleOfClass>
			<cusip>268785102</cusip>
			<value>659</value>
			<shrsOrPrnAmt>
				<sshPrnamt>150500</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>150500</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>EQT CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>26884L109</cusip>
			<value>17481</value>
			<shrsOrPrnAmt>
				<sshPrnamt>335338</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>335338</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>EQT GP HLDGS LP</nameOfIssuer>
			<titleOfClass>COM UNIT REP</titleOfClass>
			<cusip>26885J103</cusip>
			<value>38273</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2055204</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>1843600</Sole>
				<Shared>0</Shared>
				<None>211604</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>EQT MIDSTREAM PARTNERS LP</nameOfIssuer>
			<titleOfClass>UNIT LTD PARTN</titleOfClass>
			<cusip>26885B100</cusip>
			<value>540309</value>
			<shrsOrPrnAmt>
				<sshPrnamt>7793194</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>7160204</Sole>
				<Shared>0</Shared>
				<None>632990</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>EXXON MOBIL CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>30231G102</cusip>
			<value>3</value>
			<shrsOrPrnAmt>
				<sshPrnamt>35</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>35</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>FIRST SOLAR INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>336433107</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>36</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>36</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>FLUOR CORP NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>343412102</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>7</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>7</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>FMC TECHNOLOGIES INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>30249U101</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>31</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>31</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>FORUM ENERGY TECHNOLOGIES IN</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>34984V100</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>41</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>41</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>FRANKS INTL N V</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>N33462107</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>48</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>48</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>GENESIS ENERGY L P</nameOfIssuer>
			<titleOfClass>UNIT LTD PARTN</titleOfClass>
			<cusip>371927104</cusip>
			<value>202636</value>
			<shrsOrPrnAmt>
				<sshPrnamt>6050317</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>5515411</Sole>
				<Shared>0</Shared>
				<None>534906</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>GULFPORT ENERGY CORP</nameOfIssuer>
			<titleOfClass>COM NEW</titleOfClass>
			<cusip>402635304</cusip>
			<value>1066</value>
			<shrsOrPrnAmt>
				<sshPrnamt>43404</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>43404</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>HALLIBURTON CO</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>406216101</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>17</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>17</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>HANNON ARMSTRONG SUST INFR C</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>41068X100</cusip>
			<value>5</value>
			<shrsOrPrnAmt>
				<sshPrnamt>243</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>243</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>HD SUPPLY HLDGS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>40416M105</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>68</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>68</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>HELMERICH &amp; PAYNE INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>423452101</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>20</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>20</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>HESS CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>42809H107</cusip>
			<value>2109</value>
			<shrsOrPrnAmt>
				<sshPrnamt>43493</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>43493</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>HOEGH LNG PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UNIT LTD</titleOfClass>
			<cusip>Y3262R100</cusip>
			<value>443</value>
			<shrsOrPrnAmt>
				<sshPrnamt>23782</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>23782</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>HOLLY ENERGY PARTNERS L P</nameOfIssuer>
			<titleOfClass>COM UT LTD PTN</titleOfClass>
			<cusip>435763107</cusip>
			<value>53230</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1709390</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>1709390</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>HOLLYFRONTIER CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>436106108</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>22</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>22</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>IDEX CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>45167R104</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>29</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>29</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>INFRAREIT INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>45685L100</cusip>
			<value>3418</value>
			<shrsOrPrnAmt>
				<sshPrnamt>184749</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>184749</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ITC HLDGS CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>465685105</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>29</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>29</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ITRON INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>465741106</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>45</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>45</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>JPMORGAN CHASE &amp; CO</nameOfIssuer>
			<titleOfClass>ALERIAN ML ETN</titleOfClass>
			<cusip>46625H365</cusip>
			<value>16888</value>
			<shrsOrPrnAmt>
				<sshPrnamt>633513</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>582935</Sole>
				<Shared>0</Shared>
				<None>50578</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>KINDER MORGAN INC DEL</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>49456B101</cusip>
			<value>16001</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1072423</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>1072423</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>KINDER MORGAN INC DEL</nameOfIssuer>
			<titleOfClass>PFD SER A</titleOfClass>
			<cusip>49456B200</cusip>
			<value>15446</value>
			<shrsOrPrnAmt>
				<sshPrnamt>383283</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>383283</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>LAREDO PETROLEUM INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>516806106</cusip>
			<value>2374</value>
			<shrsOrPrnAmt>
				<sshPrnamt>297160</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>297160</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>LINDSAY CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>535555106</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>6</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>6</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>LYONDELLBASELL INDUSTRIES N</nameOfIssuer>
			<titleOfClass>SHS - A -</titleOfClass>
			<cusip>N53745100</cusip>
			<value>2640</value>
			<shrsOrPrnAmt>
				<sshPrnamt>30381</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>30381</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>MAGELLAN MIDSTREAM PRTNRS LP</nameOfIssuer>
			<titleOfClass>COM UNIT RP LP</titleOfClass>
			<cusip>559080106</cusip>
			<value>978469</value>
			<shrsOrPrnAmt>
				<sshPrnamt>15836465</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>14406192</Sole>
				<Shared>0</Shared>
				<None>1430273</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>MEMORIAL RESOURCE DEV CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>58605Q109</cusip>
			<value>71</value>
			<shrsOrPrnAmt>
				<sshPrnamt>4390</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>4390</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>MPLX LP</nameOfIssuer>
			<titleOfClass>COM UNIT REP LTD</titleOfClass>
			<cusip>55336V100</cusip>
			<value>677217</value>
			<shrsOrPrnAmt>
				<sshPrnamt>18870094</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>17218848</Sole>
				<Shared>0</Shared>
				<None>1651246</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>MRC GLOBAL INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>55345K103</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>39</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>39</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>MUELLER WTR PRODS INC</nameOfIssuer>
			<titleOfClass>COM SER A</titleOfClass>
			<cusip>624758108</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>137</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>137</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NABORS INDUSTRIES LTD</nameOfIssuer>
			<titleOfClass>SHS</titleOfClass>
			<cusip>G6359F103</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>90</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>90</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NATIONAL FUEL GAS CO N J</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>636180101</cusip>
			<value>21162</value>
			<shrsOrPrnAmt>
				<sshPrnamt>495025</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>495025</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NATIONAL OILWELL VARCO INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>637071101</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>19</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>19</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NEWFIELD EXPL CO</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>651290108</cusip>
			<value>10656</value>
			<shrsOrPrnAmt>
				<sshPrnamt>327280</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>327280</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NEWPARK RES INC</nameOfIssuer>
			<titleOfClass>COM PAR $.01NEW</titleOfClass>
			<cusip>651718504</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>91</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>91</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NEXTERA ENERGY INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>65339F101</cusip>
			<value>7</value>
			<shrsOrPrnAmt>
				<sshPrnamt>67</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>67</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NEXTERA ENERGY PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UNIT PART IN</titleOfClass>
			<cusip>65341B106</cusip>
			<value>837</value>
			<shrsOrPrnAmt>
				<sshPrnamt>28028</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>28028</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NISOURCE INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>65473P105</cusip>
			<value>52276</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2679421</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>2679421</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NOBLE ENERGY INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>655044105</cusip>
			<value>11340</value>
			<shrsOrPrnAmt>
				<sshPrnamt>344374</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>344374</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NORDIC AMERICAN TANKERS LIMI</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>G65773106</cusip>
			<value>761</value>
			<shrsOrPrnAmt>
				<sshPrnamt>49000</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>49000</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NRG ENERGY INC</nameOfIssuer>
			<titleOfClass>COM NEW</titleOfClass>
			<cusip>629377508</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>75</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>75</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NRG YIELD INC</nameOfIssuer>
			<titleOfClass>CL A NEW</titleOfClass>
			<cusip>62942X405</cusip>
			<value>549</value>
			<shrsOrPrnAmt>
				<sshPrnamt>37171</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>37171</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>NUSTAR ENERGY LP</nameOfIssuer>
			<titleOfClass>UNIT COM</titleOfClass>
			<cusip>67058H102</cusip>
			<value>877</value>
			<shrsOrPrnAmt>
				<sshPrnamt>21867</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>21867</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>OCCIDENTAL PETE CORP DEL</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>674599105</cusip>
			<value>16350</value>
			<shrsOrPrnAmt>
				<sshPrnamt>241822</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>241822</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ONEOK INC NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>682680103</cusip>
			<value>175696</value>
			<shrsOrPrnAmt>
				<sshPrnamt>7742212</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>7124725</Sole>
				<Shared>0</Shared>
				<None>617487</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ONEOK PARTNERS LP</nameOfIssuer>
			<titleOfClass>UNIT LTD PARTN</titleOfClass>
			<cusip>68268N103</cusip>
			<value>399938</value>
			<shrsOrPrnAmt>
				<sshPrnamt>14124537</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>13273750</Sole>
				<Shared>0</Shared>
				<None>850787</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PATTERN ENERGY GROUP INC</nameOfIssuer>
			<titleOfClass>CL A</titleOfClass>
			<cusip>70338P100</cusip>
			<value>3</value>
			<shrsOrPrnAmt>
				<sshPrnamt>145</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>145</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PATTERSON UTI ENERGY INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>703481101</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>72</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>72</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PDC ENERGY INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>69327R101</cusip>
			<value>873</value>
			<shrsOrPrnAmt>
				<sshPrnamt>16357</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>16357</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PEMBINA PIPELINE CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>706327103</cusip>
			<value>33356</value>
			<shrsOrPrnAmt>
				<sshPrnamt>1530837</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>1530837</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PENTAIR PLC</nameOfIssuer>
			<titleOfClass>SHS</titleOfClass>
			<cusip>G7S00T104</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>45</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>45</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PHILLIPS 66</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>718546104</cusip>
			<value>1538</value>
			<shrsOrPrnAmt>
				<sshPrnamt>18805</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>18805</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PHILLIPS 66 PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UNIT REP INT</titleOfClass>
			<cusip>718549207</cusip>
			<value>292778</value>
			<shrsOrPrnAmt>
				<sshPrnamt>5305338</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>4768369</Sole>
				<Shared>0</Shared>
				<None>536969</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PINNACLE WEST CAP CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>723484101</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>15</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>15</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PIONEER NAT RES CO</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>723787107</cusip>
			<value>28582</value>
			<shrsOrPrnAmt>
				<sshPrnamt>227965</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>227965</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PLAINS ALL AMERN PIPELINE L</nameOfIssuer>
			<titleOfClass>UNIT LTD PARTN</titleOfClass>
			<cusip>726503105</cusip>
			<value>688052</value>
			<shrsOrPrnAmt>
				<sshPrnamt>32738697</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>29785795</Sole>
				<Shared>0</Shared>
				<None>2952902</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PLAINS GP HLDGS L P</nameOfIssuer>
			<titleOfClass>SHS A REP LTPN</titleOfClass>
			<cusip>72651A108</cusip>
			<value>42057</value>
			<shrsOrPrnAmt>
				<sshPrnamt>4450498</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>4450498</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PPL CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>69351T106</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>70</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>70</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>PRECISION DRILLING CORP</nameOfIssuer>
			<titleOfClass>COM 2010</titleOfClass>
			<cusip>74022D308</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>40</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>40</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>QEP RES INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>74733V100</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>68</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>68</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>RANGE RES CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>75281A109</cusip>
			<value>5964</value>
			<shrsOrPrnAmt>
				<sshPrnamt>242336</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>242336</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>RICE MIDSTREAM PARTNERS LP</nameOfIssuer>
			<titleOfClass>UNIT LTD PARTN</titleOfClass>
			<cusip>762819100</cusip>
			<value>1070</value>
			<shrsOrPrnAmt>
				<sshPrnamt>79328</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>79328</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ROSE ROCK MIDSTREAM L P</nameOfIssuer>
			<titleOfClass>COM U REP LTD</titleOfClass>
			<cusip>777149105</cusip>
			<value>489</value>
			<shrsOrPrnAmt>
				<sshPrnamt>32489</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>32489</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>ROYAL DUTCH SHELL PLC</nameOfIssuer>
			<titleOfClass>SPONS ADR A</titleOfClass>
			<cusip>780259206</cusip>
			<value>5243</value>
			<shrsOrPrnAmt>
				<sshPrnamt>114500</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>114500</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>RSP PERMIAN INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>74978Q105</cusip>
			<value>3862</value>
			<shrsOrPrnAmt>
				<sshPrnamt>158328</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>158328</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SCHLUMBERGER LTD</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>806857108</cusip>
			<value>1439</value>
			<shrsOrPrnAmt>
				<sshPrnamt>20637</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>20637</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SEMGROUP CORP</nameOfIssuer>
			<titleOfClass>CL A</titleOfClass>
			<cusip>81663A105</cusip>
			<value>21279</value>
			<shrsOrPrnAmt>
				<sshPrnamt>737308</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>737308</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SEMPRA ENERGY</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>816851109</cusip>
			<value>955</value>
			<shrsOrPrnAmt>
				<sshPrnamt>10163</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>10163</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SHELL MIDSTREAM PARTNERS L P</nameOfIssuer>
			<titleOfClass>UNIT LTD INT</titleOfClass>
			<cusip>822634101</cusip>
			<value>318924</value>
			<shrsOrPrnAmt>
				<sshPrnamt>8391740</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>7681211</Sole>
				<Shared>0</Shared>
				<None>710529</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SOLARCITY CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>83416T100</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>38</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>38</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SPECTRA ENERGY CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>847560109</cusip>
			<value>146343</value>
			<shrsOrPrnAmt>
				<sshPrnamt>6112890</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>6112890</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SPECTRA ENERGY PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>84756N109</cusip>
			<value>718596</value>
			<shrsOrPrnAmt>
				<sshPrnamt>16336332</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>15064900</Sole>
				<Shared>0</Shared>
				<None>1271432</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SUNCOR ENERGY INC NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>867224107</cusip>
			<value>9189</value>
			<shrsOrPrnAmt>
				<sshPrnamt>356182</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>356182</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SUNOCO LOGISTICS PRTNRS L P</nameOfIssuer>
			<titleOfClass>COM UNITS</titleOfClass>
			<cusip>86764L108</cusip>
			<value>592417</value>
			<shrsOrPrnAmt>
				<sshPrnamt>25261521</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>23051245</Sole>
				<Shared>0</Shared>
				<None>2210276</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SUNPOWER CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>867652406</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>77</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>77</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SUNRUN INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>86771W105</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>168</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>168</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>SUPERIOR ENERGY SVCS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>868157108</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>47</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>47</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TALLGRASS ENERGY PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UNIT</titleOfClass>
			<cusip>874697105</cusip>
			<value>26185</value>
			<shrsOrPrnAmt>
				<sshPrnamt>635404</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>635404</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TARGA RES CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>87612G101</cusip>
			<value>98672</value>
			<shrsOrPrnAmt>
				<sshPrnamt>4104080</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>3646399</Sole>
				<Shared>0</Shared>
				<None>457681</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TARGA RESOURCES PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UNIT</titleOfClass>
			<cusip>87611X105</cusip>
			<value>79365</value>
			<shrsOrPrnAmt>
				<sshPrnamt>4801295</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>4801295</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TERRAFORM PWR INC</nameOfIssuer>
			<titleOfClass>CL A COM</titleOfClass>
			<cusip>88104R100</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>31</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>31</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TESLA MTRS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>88160R101</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>8</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>8</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TESORO CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>881609101</cusip>
			<value>2453</value>
			<shrsOrPrnAmt>
				<sshPrnamt>23282</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>23282</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TESORO LOGISTICS LP</nameOfIssuer>
			<titleOfClass>COM UNIT LP</titleOfClass>
			<cusip>88160T107</cusip>
			<value>461866</value>
			<shrsOrPrnAmt>
				<sshPrnamt>10106110</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>9178578</Sole>
				<Shared>0</Shared>
				<None>927532</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TETRA TECH INC NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>88162G103</cusip>
			<value>3</value>
			<shrsOrPrnAmt>
				<sshPrnamt>117</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>117</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TETRA TECHNOLOGIES INC DEL</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>88162F105</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>104</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>104</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>TRANSCANADA CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>89353D107</cusip>
			<value>87807</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2694298</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>2694298</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>U S SILICA HLDGS INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>90346E103</cusip>
			<value>0</value>
			<shrsOrPrnAmt>
				<sshPrnamt>21</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>21</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>UBS AG JERSEY BRH</nameOfIssuer>
			<titleOfClass>ALERIAN INFRST</titleOfClass>
			<cusip>902641646</cusip>
			<value>77</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2950</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>0</Sole>
				<Shared>0</Shared>
				<None>2950</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>VALERO ENERGY CORP NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>91913Y100</cusip>
			<value>2387</value>
			<shrsOrPrnAmt>
				<sshPrnamt>33753</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>33753</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>VALERO ENERGY PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UNT REP LP</titleOfClass>
			<cusip>91914J102</cusip>
			<value>208358</value>
			<shrsOrPrnAmt>
				<sshPrnamt>4413762</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>4037163</Sole>
				<Shared>0</Shared>
				<None>376599</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>VTTI ENERGY PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UNIT RP LT</titleOfClass>
			<cusip>Y9384M101</cusip>
			<value>13919</value>
			<shrsOrPrnAmt>
				<sshPrnamt>671461</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>671461</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>WATTS WATER TECHNOLOGIES INC</nameOfIssuer>
			<titleOfClass>CL A</titleOfClass>
			<cusip>942749102</cusip>
			<value>3</value>
			<shrsOrPrnAmt>
				<sshPrnamt>67</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>67</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>WEATHERFORD INTL PLC</nameOfIssuer>
			<titleOfClass>ORD SHS</titleOfClass>
			<cusip>G48833100</cusip>
			<value>1</value>
			<shrsOrPrnAmt>
				<sshPrnamt>73</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>73</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>WEC ENERGY GROUP INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>92939U106</cusip>
			<value>2</value>
			<shrsOrPrnAmt>
				<sshPrnamt>47</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>47</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>WESTERN GAS EQUITY PARTNERS</nameOfIssuer>
			<titleOfClass>COMUNT LTD PT</titleOfClass>
			<cusip>95825R103</cusip>
			<value>87131</value>
			<shrsOrPrnAmt>
				<sshPrnamt>2757697</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>2400967</Sole>
				<Shared>0</Shared>
				<None>356730</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>WESTERN GAS PARTNERS LP</nameOfIssuer>
			<titleOfClass>COM UNIT LP IN</titleOfClass>
			<cusip>958254104</cusip>
			<value>481499</value>
			<shrsOrPrnAmt>
				<sshPrnamt>11086053</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>10130414</Sole>
				<Shared>0</Shared>
				<None>955639</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>WESTLAKE CHEM CORP</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>960413102</cusip>
			<value>1924</value>
			<shrsOrPrnAmt>
				<sshPrnamt>35424</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>35424</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>WHITING PETE CORP NEW</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>966387102</cusip>
			<value>1387</value>
			<shrsOrPrnAmt>
				<sshPrnamt>146877</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>146877</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>WILLIAMS COS INC DEL</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>969457100</cusip>
			<value>238334</value>
			<shrsOrPrnAmt>
				<sshPrnamt>10027768</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>9273713</Sole>
				<Shared>0</Shared>
				<None>754055</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>WILLIAMS PARTNERS L P NEW</nameOfIssuer>
			<titleOfClass>COM UNIT LTD PAR</titleOfClass>
			<cusip>96949L105</cusip>
			<value>140956</value>
			<shrsOrPrnAmt>
				<sshPrnamt>5061252</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>5061252</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
		<infoTable>
			<nameOfIssuer>XYLEM INC</nameOfIssuer>
			<titleOfClass>COM</titleOfClass>
			<cusip>98419M100</cusip>
			<value>7</value>
			<shrsOrPrnAmt>
				<sshPrnamt>181</sshPrnamt>
				<sshPrnamtType>SH</sshPrnamtType>
			</shrsOrPrnAmt>
			<investmentDiscretion>SOLE</investmentDiscretion>
			<otherManager>N/A</otherManager>
			<votingAuthority>
				<Sole>181</Sole>
				<Shared>0</Shared>
				<None>0</None>
			</votingAuthority>
		</infoTable>
</informationTable>
