EXHIBIT 99.1 Summit Midstream Partners, LP 910 Louisiana Street, Suite 4200 Houston, TX 77002 Summit Midstream Partners, LP Reports Fourth Quarter and Full-Year 2023 Financial and Operating Results, 2024 Guidance and Strategic Alternatives Update Houston, Texas (March 15, 2024) – Summit Midstream Partners, LP (NYSE: SMLP) (“Summit”, “SMLP” or the “Partnership”) announced today its financial and operating results for fourth quarter and full-year 2023, provided full-year 2024 financial guidance and updated it ...