Annual report pursuant to Section 13 and 15(d)

Cover

v3.22.1
Cover - USD ($)
 9 Months Ended
Dec. 31, 2021
Mar. 30, 2022
Jun. 30, 2021
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --12-31    
Entity File Number 001-41119    
Entity Registrant Name ST Energy Transition I Ltd.    
Entity Central Index Key 0001858684    
Entity Tax Identification Number 00-0000000    
Entity Incorporation, State or Country Code D0    
Entity Address, Address Line One Par-la-Ville Place    
Entity Address, Address Line Two 4th Floor    
Entity Address, Address Line Three 14 Par-la-Ville Road    
Entity Address, City or Town Hamilton    
Entity Address, Country BM    
Entity Address, Postal Zip Code HM08    
City Area Code (441)    
Local Phone Number 295-6935    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
Elected Not To Use the Extended Transition Period false    
Entity Shell Company true    
Entity Public Float     $ 0
ICFR Auditor Attestation Flag false    
Auditor Firm ID 688    
Auditor Name Marcum LLP    
Auditor Location New York, NY    
Sail S M Securities Each Consisting Of One Class A Share Of 0. 0001 Par Value Per Share And One Half Of One Redeemable Warrant [Member]      
Title of 12(b) Security SAILSM securities, each consisting of one Class A share, of $0.0001 par value per share, and one-half of one redeemable warrant    
Trading Symbol STET.U    
Security Exchange Name NYSE    
Class Shares 0. 0001 Par Value Per Share Included As Part Of Sail S M Securities [Member]      
Title of 12(b) Security Class A shares, $0.0001 par value per share, included as part of the SAILSM securities    
Trading Symbol STET    
Security Exchange Name NYSE    
Redeemable Warrants Each Whole Warrant Exercisable For One Class Share At Exercise Price Of 11. 50 Included As Part Of Sail S M Securities [Member]      
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one Class A share at an exercise price of $11.50, included as part of the SAILSM securities    
Trading Symbol STETWS    
Security Exchange Name NYSE    
Common Class A [Member]      
Entity Common Stock, Shares Outstanding   28,750,000  
Common Class B [Member]      
Entity Common Stock, Shares Outstanding   1,437,500