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    <ACCEPTANCE-DATETIME>20240311081929
    ACCESSION NUMBER:		0001842279-24-000003
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		16
    CONFORMED PERIOD OF REPORT:	20240305
    ITEM INFORMATION:		Entry into a Material Definitive Agreement
    ITEM INFORMATION:		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20240311
    DATE AS OF CHANGE:		20240311

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			OPAL Fuels Inc.
    		CENTRAL INDEX KEY:			0001842279
    		STANDARD INDUSTRIAL CLASSIFICATION:	GAS & OTHER SERVICES COMBINED [4932]
    		ORGANIZATION NAME:           	01 Energy & Transportation
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			E9
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-40272
    		FILM NUMBER:		24736629

    	BUSINESS ADDRESS:
    		STREET 1:		200 CLARENDON STREET, 55TH FLOOR
    		CITY:			BOSTON
    		STATE:			MA
    		ZIP:			02116
    		BUSINESS PHONE:		617-531-6300

    	MAIL ADDRESS:
    		STREET 1:		200 CLARENDON STREET, 55TH FLOOR
    		CITY:			BOSTON
    		STATE:			MA
    		ZIP:			02116

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ArcLight Clean Transition Corp. II
    		DATE OF NAME CHANGE:	20210125
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    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>opal-20240305.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: opal-20240305.htm

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    <DOCUMENT>
    <TYPE>EX-10.1
    <SEQUENCE>2
    <FILENAME>a101opal-paragonxfirstamen.htm
    <DESCRIPTION>EX-10.1
    <TEXT>
    Document 2 - file: a101opal-paragonxfirstamen.htm

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    <TYPE>EX-10.2
    <SEQUENCE>3
    <FILENAME>a102opal-paragonxfirstamen.htm
    <DESCRIPTION>EX-10.2
    <TEXT>
    Document 3 - file: a102opal-paragonxfirstamen.htm

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    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>opal-20240305.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
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    <FILENAME>opal-20240305_lab.xml
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    <TEXT>
    Document 5 - file: opal-20240305_lab.xml

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    <SEQUENCE>6
    <FILENAME>opal-20240305_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: opal-20240305_pre.xml

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    <TYPE>XML
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    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <TYPE>EXCEL
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    <FILENAME>Financial_Report.xlsx
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    <TEXT>
    Document 9 - file: Financial_Report.xlsx

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    <SEQUENCE>10
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    <TEXT>
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    <SEQUENCE>11
    <FILENAME>report.css
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    <TEXT>
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    <TYPE>XML
    <SEQUENCE>13
    <FILENAME>FilingSummary.xml
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    <TEXT>
    Document 13 - file: FilingSummary.html

    Document 13 - RAW XML: FilingSummary.xml

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    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>15
    <FILENAME>MetaLinks.json
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    <TEXT>
    Document 15 - file: MetaLinks.json

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    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>16
    <FILENAME>0001842279-24-000003-xbrl.zip
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    <TEXT>
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    <FILENAME>opal-20240305_htm.xml
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