Exhibit 16.1

August 31, 2023

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549-7561

Dear Sirs/Madams:

We have read Item 4.01 of Altus Power, Inc.’s Form 8-K dated August 31, 2023, and have the following comments:

1.We agree with the statements made in paragraphs 2, 3, 4, 5, 6 and 7 therein.

2.We have no basis on which to agree or disagree with the statements made in paragraph 1 therein.

Yours truly,

/s/ Deloitte & Touche LLP

Stamford, CT