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, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 498,631	$ 471,044
2007 Vento I, LLC
Schedule of Equity Method Investments [Line Items]
Carrying Value	79,000
Buckeye Wind Energy Class B Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Carrying Value	73,000
Vivint Solar Asset 1 Class B, LLC
Schedule of Equity Method Investments [Line Items]
Carrying Value	60,000
2019 K102 Investor LLC
Schedule of Equity Method Investments [Line Items]
Carrying Value	48,000
Invenergy Gunsight Mountain Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Carrying Value	35,000
3D Energie, LLC
Schedule of Equity Method Investments [Line Items]
Carrying Value	34,000
Vivint Solar Asset 2 Class B, LLC
Schedule of Equity Method Investments [Line Items]
Carrying Value	32,000
Helix Fund I, LLC
Schedule of Equity Method Investments [Line Items]
Carrying Value	26,000
Other transactions
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 112,000