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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Feb. 09, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity Registrant Name STEM, INC.    
Entity Incorporation, State or Country Code DE    
Entity File Number 333-251397    
Entity Tax Identification Number 85-1972187    
Entity Address, Address Line One 100 California St., 14th Fl    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94111    
Country Region 1    
City Area Code 877    
Local Phone Number 374-7836    
Title of 12(b) Security Common Stock, par value $0.0001    
Trading Symbol STEM    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 1,026
Entity Common Stock, Shares Outstanding   154,574,741  
Documents Incorporated by Reference Certain information required to be furnished pursuant to Part III of this Form 10-K is set forth in, and is incorporated by reference from, Stem’s definitive proxy statement for its 2023 Annual Meeting of Stockholders, to be filed by Stem with the Securities and Exchange Commission (“SEC”) pursuant to Regulation 14A within 120 days after December 31, 2022 (the “2023 Proxy Statement”).    
Entity Central Index Key 0001758766    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false