[SMM PV News] RWE Scraps 99.9 MW Solar-plus-Storage Project in Wales Over Grid Constraints

Published: Apr 16, 2026 13:41

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RWE has withdrawn its 99.9 MW Butterfly (Glöyn Byw) solar-plus-storage project in Wales after determining that grid connection delays made the scheme unviable. Despite exploring alternative routes through 2025, the developer cited severe congestion in the UK's grid queue—where some projects face wait times into the mid-2030s—as the decisive factor. The cancellation underscores how grid bottlenecks are now dictating early-stage project viability across the UK. However, RWE maintained that solar and storage remain central to its strategy, with the group still planning €35 billion in global investments by 2030 to expand its flexible capacity and storage portfolio.

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