Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what estimate his Department has made of the cost of constraint payments and balancing actions in each year since 2020; and what assessment his Department has made of the potential impact of this on domestic energy bills.

The breakdown of curtailment and balancing action costs borne by domestic consumers and other data relating to constraints is provided in the National Energy System Operator (NESO) Annual Balancing Report. The most recent of these reports was published in June 2025 which can be found via this link: neso.energy/document/362561/download. We recognise that actions are needed to reduce system constraints. The current extent of grid constraints reflects years of underinvestment, with new network infrastructure development having lagged the expansion of new generation. We are already taking action to reduce constraints with the biggest upgrade to Great Britain’s electricity network in decades.