HA Sustainable Infrastructure Capital, Inc. Annual report pursuant to Section 13 and 15(d)

Our Portfolio - Equity Method Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 1,279,651	$ 498,631
Jupiter Equity Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	465,000
Lighthouse Partnerships
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	201,000
University of Iowa Energy Collaborative Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	118,000
Buckeye Wind Energy Class B Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	72,000
Vivint Solar Asset 2 Class B, LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	66,000
Other investees
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 358,000