Elexon has been commissioned to undertake several programmes of work on behalf of the UK government and Ofgem. These include implementing complex, far-reaching industry changes such as Market-wide Half-Hourly Settlement and developing the Smart Data Repository open data platform, as well as administering short‑term schemes like the Energy Price Guarantee
Ongoing programmes
Market-wide Half-Hourly Settlement
Programme status: Central Systems now live; Suppliers transitioning meters from 22 October 2025
Half-Hourly Settlement (HHS) involves measuring and settling electricity consumption at half-hour intervals, and is used for businesses and consumers that have smart meters to record energy usage in more granular time frames, typically every 30 minutes.
The Market-wide Half-Hourly Settlement (MHHS) programme is being run by Elexon to deliver Half-Hourly Settlement and is one of the biggest changes to energy markets since retail competition was introduced in the late 1990s.
Smart Data Repository
Programme status: In development – due to be complete end 2026
The Smart Data Repository will provide open, privacy‑protected access to aggregated smart meter data to support innovation, flexibility and decarbonisation across the energy system.
Find out how this new platform will make high‑quality half‑hourly consumption data available, helping suppliers, innovators and researchers develop smarter products and services for consumers.
Completed programmes
Energy Price Guarantee scheme administration
Programme status: Administered EPG scheme from October 2022 until March 2024.
The Energy Price Guarantee (EPG) was a temporary government program that capped the price of gas and electricity for domestic customers in the UK to help reduce the impact of the energy crisis.
Elexon managed the Scheme Administrator for the Energy Price Guarantee covering domestic electricity consumers in Great Britain. As the Scheme Administrator Elexon managed the estimation of domestic consumption and associated payment arrangements to and from Suppliers that take part in the scheme.