UK regulator says that repeated selling and curtailment of hydropower output by stations and batteries has added £99 million to consumer bills.

The investigation points to market design flaws that let operators resell electricity at short‑term peaks, inflating prices for households and businesses.

Energy analysts say the practice erodes trust in the grid and signals that the current pricing framework rewards instant supply over long‑term stability.

Regulators plan to tighten rules to curb resale, aiming to protect consumers and ensure fair market dynamics.