Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Mar. 09, 2015	Jun. 30, 2014
Document and Entity Information:
Entity Registrant Name	PLUG POWER INC
Document Type	10-K
Document Period End Date	Dec. 31, 2014
Amendment Flag	false
Entity Central Index Key	0001093691
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		173,406,363
Entity Public Float			$ 777,048,639
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY