X0407 4 2023-05-17 0 0001772695 Sunnova Energy International Inc. NOVA 0001228688 SHAPER C PARK 20 EAST GREENWAY PLAZA SUITE 540 HOUSTON TX 77046 1 0 0 0 0 Common Stock 2023-05-18 4 M 0 7255 0.00 A 11560 D Common Stock 1278067 I See Footnote Restricted Stock Units 2023-05-17 4 A 0 7566 0.00 A Common Stock 7566 14821 D Restricted Stock Units 2023-05-18 4 M 0 7255 0.00 D Common Stock 7255 7566 D Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of common stock of Sunnova Energy International Inc. ("Common Stock"). Such shares of Common Stock are owned directly by Seis Holdings LLC. The reporting person serves as the Chief Executive Officer for, and he and his spouse hold membership interests in, Seis Holdings LLC. The reporting person disclaims beneficial ownership of this Common Stock except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such Common Stock for purposes of Section 16 or for any other purpose. The RSUs will vest on the one year anniversary of the date of grant subject to the reporting person's continued service through that date. Common Stock will be delivered to the reporting person no later than 15 days after the RSUs vest. /s/ David Searle by Power of Attorney 2023-05-19