Exhibit 99.1 CMS Energy Announces Strong Third Quarter Results, Raises 2025 Adjusted EPS, Initiates 2026 Guidance JACKSON, Mich., Oct. 30, 2025 – CMS Energy announced today reported earnings per share of $0.92 for the third quarter of 2025, compared to$0.84 per share for 2024. The company's adjusted earnings per share for the third quarter were $0.93, compared to$0.84 per share for the same quarter in 2024. For the first nine months of the year, the company reported $2.59 per share compared to$2.45 per s ...