RWE Commissions Cartwheel 150 MW / 300 MWh BESS Project
- Energy Storage News On-Site Generation & Microgrids Utility-Scale BESS
Marin Holt
- 0
- 5 minutes read
- Two-hour duration: 300 MWh of energy across 150 MW of power
- Sited in Sulphur Springs, Texas, developed and owned by RWE
- One of 15 U.S. projects, roughly 2 GW, RWE commissioned during 2025 and announced March 5, 2026
- Three of those 15 were batteries: Cartwheel, the identically sized Crowned Heron, and Ventasso in California
- RWE has not disclosed an offtake structure or contracted revenue for Cartwheel
RWE has commissioned Cartwheel, a 150 MW / 300 MWh battery in Sulphur Springs, Texas. The project was one of 15 that RWE brought online across the United States during 2025, a portfolio the company put at roughly 2 GW when it announced the total on March 5, 2026.
Cartwheel Project Details
Cartwheel is a two-hour system: 300 MWh of energy across 150 MW of power. RWE commissioned an identically sized twin in Texas the same year, Crowned Heron, alongside a 100 MW / 200 MWh battery paired with the 200 MW Stoneridge Solar project and a 50 MW / 220 MWh battery at Ventasso in California. RWE has not published an offtake structure, a market, or a contracted revenue figure for Cartwheel, so how the project earns in ERCOT is not public.
Critical Perspective
RWE commissioned roughly 2 GW of new U.S. capacity during 2025 and announced the total in March 2026. This 150 MW battery is a small fraction of that, and three of the 15 projects were batteries. Will this project deliver its promised grid stability at the projected cost?
Why It Matters
The commissioning of Cartwheel by RWE aligns with broader trends in the U.S. energy sector. According to RWE’s press release of March 5, 2026, the company commissioned roughly 2 GW of new energy projects in the U.S. over the course of 2025. This expansion is part of a significant growth in renewable energy capacity across the nation. For instance, the U.S. added 26.5 GW of solar power in 2025 alone, as reported by pv magazine USA. Energy storage projects like Cartwheel are crucial for integrating these intermittent renewable sources into the grid, ensuring power availability when solar or wind generation is low.
Market Context
The increasing deployment of large-scale energy storage systems is a direct response to the growing penetration of renewables. Projects such as Cartwheel play a vital role in grid modernization by providing essential services like frequency regulation, peak shaving, and backup power. RWE’s continued investment in the U.S. market, as evidenced by their 2 GW of commissioned projects, underscores the strategic importance of energy storage in achieving a more robust and sustainable energy future. The development of on-site generation and microgrid-capable assets is becoming increasingly important for industrial and commercial entities seeking greater energy independence and reliability.
