Elexon has officially confirmed that over one million electricity meters have now transitioned into Market-wide Half-Hourly Settlement (MHHS)—a major milestone in the ongoing reform of the GB electricity market.
Key Points
- 80% of all GB meters (approx. 25.9 million) are expected to be settled half-hourly by October 2026, making 2026 a pivotal year in the rollout.
- The shift enables suppliers to use actual half-hourly consumption data, helping them create more flexible, time‑of‑use tariffs.
- These tariffs can support:
- Smart EV charging that automatically charges at optimal times.
- Consumer participation in demand balancing by exporting power at remunerated rates.
- Settlement Accuracy Improvements: More actual data (vs estimates) is already being used, improving billing precision and system efficiency.
- Smart Data Repository:
Launching in autumn 2026, it will publish aggregated half-hourly data, enabling innovators to develop new products and flexibility services accessible to all market participants. - Next Steps for Industry:
More than 100 companies still need to complete qualification to operate in the new MHHS arrangements, and Elexon’s focus is on supporting a smooth transition.
More than one million meters transferred to half-hourly settlement – Elexon