Exhibit 99.1

The expenses to be incurred by CMS Energy Corporation relating to the offering of $1,000,000,000 principal amount of its 6.800% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2057, under CMS Energy Corporation’s Registration Statement on Form S-3 (Registration No. 333-293382) and a related prospectus supplement filed with the Securities and Exchange Commission and dated October 29, 2026 are estimated to be as follows:

Estimated Fees