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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 DMfhLtKx0bZst9zWzBB7cO4rihtV8l4T044ULq6EI+kghxi0XcHb4pBdTlSN51GH
 3O0oU7C6ORnnXartxVPBJQ==

<SEC-DOCUMENT>0001127602-10-019052.txt : 20100712
<SEC-HEADER>0001127602-10-019052.hdr.sgml : 20100712
<ACCEPTANCE-DATETIME>20100712115158
ACCESSION NUMBER:		0001127602-10-019052
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100706
FILED AS OF DATE:		20100712
DATE AS OF CHANGE:		20100712

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CLOUD PEAK ENERGY INC.
		CENTRAL INDEX KEY:			0001441849
		STANDARD INDUSTRIAL CLASSIFICATION:	BITUMINOUS COAL & LIGNITE SURFACE MINING [1221]
		IRS NUMBER:				263088162
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		505 SOUTH GILLETTE AVE.
		CITY:			GILLETTE
		STATE:			WY
		ZIP:			82716
		BUSINESS PHONE:		307-687-6000

	MAIL ADDRESS:	
		STREET 1:		505 SOUTH GILLETTE AVE.
		CITY:			GILLETTE
		STATE:			WY
		ZIP:			82716

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MYERS TODD A
		CENTRAL INDEX KEY:			0001169888

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34547
		FILM NUMBER:		10947560

	MAIL ADDRESS:	
		STREET 1:		2 NORTH CASCADE AVENUE
		STREET 2:		C/O WESTMORELAND COAL COMPANY
		CITY:			COLORADO SPRING
		STATE:			CO
		ZIP:			80903
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>form3.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2010-07-06</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001441849</issuerCik>
        <issuerName>CLOUD PEAK ENERGY INC.</issuerName>
        <issuerTradingSymbol>CLD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001169888</rptOwnerCik>
            <rptOwnerName>MYERS TODD A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>505 S. GILLETTE AVE.</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>GILLETTE</rptOwnerCity>
            <rptOwnerState>WY</rptOwnerState>
            <rptOwnerZipCode>82716</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>Sr VP, Business Development</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>/s/ Amy J. Stefonick, attorney-in-fact for Mr. Myers</signatureName>
        <signatureDate>2010-07-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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