X0609 4 2026-06-03 0 0001561894 HA Sustainable Infrastructure Capital, Inc. HASI 0001283890 ARDISANA LIZABETH A false ONE PARK PLACE SUITE 200 ANNAPOLIS MD 21401 1 0 0 0 0 Common stock, par value $0.01 per share 1862 D LTIP Units 2026-06-03 4 A 0 5574 0 A Common stock, par value $0.01 per share 5574 21988 D Includes 317 shares of Common stock which were acquired through a dividend reinvestment program since the Reporting Owner's last Section 16 filing. 21,988 units of limited partner interest ("OP Units") in Hannon Armstrong Sustainable Infrastructure, LP (the "Partnership") are issuable upon the vesting and conversion of 21,988 long-term incentive plan units ("LTIP Units") in the Partnership. Vested LTIP Units, after achieving parity with OP Units (as described in the Partnership's Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement")), are eligible to be converted into OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership Agreement. Upon conversion of LTIP Units into OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's OP Units for cash in an amount equal to the market value (as defined in the Partnership Agreement) of an equivalent number of shares of common stock, par value $0.01 per share, of HA Sustainable Infrastructure Capital, Inc. (the "Issuer"), or at the Issuer's option, shares of the Issuer's common stock on a one-for-one basis, subject to certain adjustments. N/A Exhibit No. 24.1 Power of Attorney dated April 30, 2026. /s/ Michael Stephan, Attorney-in-Fact 2026-06-05