Quarterly report pursuant to Section 13 or 15(d)


6 Months Ended
Jun. 30, 2023
Document and Entity Information [Abstract]  
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Jun. 30, 2023
Document Transition Report false
Entity File Number 001-36103
Entity Registrant Name TECOGEN INC.
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 04-3536131
Entity Address, Address Line One 45 First Avenue
Entity Address, City or Town Waltham
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02451
City Area Code 781
Local Phone Number 466-6402
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 24,850,261
Entity Central Index Key 0001537435
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2023
Document Fiscal Period Focus Q2
Amendment Flag false