Quarterly report pursuant to Section 13 or 15(d)

Cover Page

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Cover Page - shares
9 Months Ended
Sep. 30, 2021
Nov. 08, 2021
Document Information [Line Items]    
Document Type 10-Q/A  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2021  
Document Transition Report false  
Entity File Number 001-39644  
Entity Registrant Name Archaea Energy Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 85-2867266  
Entity Address, Address Line One 4444 Westheimer Road  
Entity Address, Address Line Two Suite G450  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77027  
City Area Code 346  
Local Phone Number 708-8272  
Entity Information, Former Legal or Registered Name Rice Acquisition Corp.  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Amendment Flag true  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001823766  
Amendment Description References throughout this Amendment No. 1 to the Quarterly Report on Form 10-Q/A to “we,” “us,” "our," or the “Company” are to Archaea Energy Inc., formerly known as Rice Acquisition Corp., unless the context otherwise indicates. This Amendment No. 1 (“Amendment No. 1”) to the Quarterly Report on Form 10-Q/A amends and restates the Quarterly Report on Form 10-Q of Archaea Energy Inc. (the “Company”) as of and for the period ended September 30, 2021, as filed with the Securities and Exchange Commission (“SEC”) on November 15, 2021.  RESTATEMENT BACKGROUND On November 15, 2021, the Company filed its Form 10-Q for the quarterly period ending September 30, 2021 (the “Original Filing”). Subsequent to filing, the Company identified an accounting error related to a duplicate entry recorded for the reverse recapitalization transaction. Specifically, an entry was recorded to both the subledger and general ledger as part of the movement of activity from Archaea Energy LLC to the newly formed Archaea Energy II LLC for the reverse recapitalization resulting in a duplicate entry error. The error caused an understatement of accounts payable - trade and general and administrative expenses of $2.8 million in our successor financial statements. On December 28, 2021, the Company’s management and the audit committee of the Company’s board of directors concluded that the Company’s previously issued unaudited condensed financial statements included in our Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2021 should no longer be relied upon to due to the impact on accounts payable - trade, general and administrative expenses, and our consolidated net loss. Accordingly, we have restated our unaudited consolidated condensed financial statements as of and for the three and nine months ended September 30, 2021 to reflect the correct amount of general and administrative expenses and accounts payable - trade. See Note 2 - Basis of Presentation and Summary of Significant Accounting Policies for further discussion. INTERNAL CONTROL CONSIDERATIONS After re-evaluation, the Company’s management has concluded that in light of the errors described above, a material weakness existed in the Company’s internal control over financial reporting during the nine-month period ended September 30, 2021 and that the Company’s controls and procedures were not effective. The Company’s remediation plan with respect to such material weakness is described in more detail in Item 4 to Part 1 of this Form 10-Q/A.ITEMS AMENDED IN THIS AMENDMENT NO. 1For the convenience of the reader, this Amendment No. 1 amends and restates the Q3 Form 10-Q in its entirety. As a result, this Amendment No. 1 includes both items that have been changed as a result of the restatement described above as well as items that are unchanged from the Q3 Form 10-Q. The following items have been amended in this Amendment No. 1 to reflect the restatement described above:•Part I, Item 1. Consolidated Condensed Financial Statements•Part I, Item 2. Management's Discussion and Analysis of Financial Condition And Results of Operations•Part I, Item 4. Controls and Procedures•Part II, Item 6. ExhibitsIn addition, in accordance with applicable SEC rules, this Amendment No. 1 includes new certifications required by Sections 302 and 906 of the Sarbanes-Oxley Act from our Chief Executive Officer (as principal executive officer) and our Chief Financial Officer (as principal financial officer) dated as of the filing date of this Amendment No. 1.Except as described above, this Amendment No. 1 does not amend, update or change any other items or disclosures in the Q3 Form 10-Q. This Amendment No. 1 does not purport to reflect any information or events subsequent to the filing date of the Q3 Form 10-Q. As such, this Amendment No. 1 speaks only as of the date the Q3 Form 10-Q was filed, and we have not undertaken herein to amend, supplement or update any information contained in the Q3 Form 10-Q to give effect to any subsequent events. Accordingly, this Amendment No. 1 should be read in conjunction with our filings made with the SEC subsequent to the filing of the Q3 Form 10-Q.  
Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Class A Common Stock, par value $0.0001 per share  
Trading Symbol LFG  
Security Exchange Name NYSE  
Class A Units    
Document Information [Line Items]    
Title of 12(b) Security Warrants, each exercisable for one share of Class A Common Stock at a price of $11.50 per share  
Trading Symbol LFG WS  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   53,590,976
Class B Units    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   62,281,735
Former Address    
Document Information [Line Items]    
Entity Address, Address Line One 102 East Main Street  
Entity Address, Address Line Two Second Story  
Entity Address, City or Town Carnegie  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 15106