v3.19.3
Cover Page - shares
9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2019  
Document Transition Report false  
Entity File Number 001-36542  
Entity Registrant Name TerraForm Power, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 46-4780940  
Entity Address, Address Line One 200 Liberty Street,  
Entity Address, Address Line Two 14th Floor  
Entity Address, City or Town New York,  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10281  
City Area Code 646  
Local Phone Number 992-2400  
Title of 12(b) Security Common Stock, Class A, par value $0.01  
Trading Symbol TERP  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   227,044,072
Entity Central Index Key 0001599947  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false