CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net income	$ 19,931,000	$ 29,780,000	$ 42,410,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	40,211,000	35,080,000	20,024,000
Amortization of deferred financing costs	3,241,000	4,383,000	3,588,000
Allowance for funds used during construction - equity	(3,048,000)	(1,106,000)	(21,655,000)
Change in fair value of contingent consideration	0	18,357,000	841,000
Reorganization structuring fee	44,897,000
Realized gain on sale of marketable securities	(66,000)
Equity based compensation	678,000	120,000
Changes in assets and liabilities:
Due from affiliates	(3,350,000)	(7,275,000)	(17,436,000)
Inventory	662,000	(816,000)	(4,414,000)
Prepaids and other current assets	(6,000)	(3,370,000)	(1,388,000)
Accounts payable and accrued liabilities	2,644,000	7,347,000	(649,000)
Net cash provided by operating activities	105,794,000	82,500,000	21,321,000
Cash flows from investing activities
Additions to electric plant	(239,157,000)	(210,791,000)	(390,283,000)
Proceeds from sale of assets	41,211,000
Sale of marketable securities	1,065,000
Cash paid to InfraREIT, L.L.C. investors in the merger, net of cash assumed	(172,400,000)
Net cash used in investing activities	(369,281,000)	(210,791,000)	(390,283,000)
Cash flows from financing activities
Net proceeds from issuance of common stock upon initial public offering	493,722,000
Members' contributions			136,886,000
Noncontrolling interest contributions			2,256,000
Proceeds from short-term borrowings	87,000,000	354,000,000	85,000,000
Repayments of short-term borrowings	(253,000,000)	(210,000,000)	(15,000,000)
Proceeds from borrowings of long-term debt	400,000,000	11,000,000	173,000,000
Repayments of long-term debt	(404,867,000)	(13,934,000)	(8,178,000)
Net change in restricted cash		(1,000)
Deferred financing costs	(3,914,000)	(4,908,000)	(1,523,000)
Dividends and distributions paid	(61,595,000)		(12,175,000)
Net cash provided by financing activities	257,346,000	136,157,000	360,266,000
Net (decrease) increase in cash and cash equivalents	(6,141,000)	7,866,000	(8,696,000)
Cash and cash equivalents at beginning of year	15,612,000	7,746,000	16,442,000
Cash and cash equivalents at end of year	$ 9,471,000	$ 15,612,000	$ 7,746,000