Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2021
Mar. 29, 2022
Jun. 30, 2021
Document Information Line Items      
Entity Registrant Name CLEANTECH ACQUISITION CORP.    
Trading Symbol CLAQ    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   21,562,500  
Entity Public Float     $ 0
Amendment Flag false    
Entity Central Index Key 0001849820    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Shell Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-40611    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 85-1699753    
Entity Address, Address Line One 207 West 25th Street,    
Entity Address, Address Line Two 9th Floor    
Entity Address, City or Town New York,    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10001    
City Area Code (212)    
Local Phone Number 494-9005    
Title of 12(b) Security Common Stock    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Auditor Name WithumSmith+Brown, PC    
Auditor Location New York, New York    
Auditor Firm ID 100