v3.26.1
Cover
Jun. 15, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 15, 2026
Entity File Number 001-35877
Entity Registrant Name HA SUSTAINABLE INFRASTRUCTURE CAPITAL, INC.
Entity Central Index Key 0001561894
Entity Tax Identification Number 46-1347456
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One One Park Place
Entity Address, Address Line Two Suite 200
Entity Address, City or Town Annapolis
Entity Address, State or Province MD
Entity Address, Postal Zip Code 21401
City Area Code 410
Local Phone Number 571-9860
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.01 par value per share
Trading Symbol HASI
Security Exchange Name NYSE
Entity Emerging Growth Company false