Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information Document and Entity Information

v2.4.0.6
Document and Entity Information Document and Entity Information (USD $)
3 Months Ended
Mar. 31, 2013
May 13, 2013
Jun. 29, 2012
Document and Entity Information [Abstract]      
Entity Registrant Name TECOGEN INC.    
Entity Central Index Key 0001537435    
Current Fiscal Year End Date --03-31    
Entity Filer Category Smaller Reporting Company    
Document Type 10-Q    
Document Period End Date Mar. 31, 2013    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   54,447,854  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 0