Elexon

Elexon is the central administrator for electricity settlement in Great Britain, operating under the Balancing and Settlement Code (BSC). They're responsible for comparing what generators produced with what was consumed, and settling the financial differences.

Elexon responsibilities:

• Managing the Balancing and Settlement Code (BSC)
• Operating the settlement system that matches supply and demand financially
• Administering the Market-wide Half-Hourly Settlement (MHHS) programme
• Managing meter registration and data flows
• Publishing market data and reports

Settlement explained: Every day, Elexon calculates how much electricity each supplier's customers used and compares this to what was contracted in the wholesale market. Differences are settled at the System Sell Price or System Buy Price.

MHHS programme: Elexon is leading the industry transition to Market-wide Half-Hourly Settlement, the major reform that will see all electricity meters settled on actual half-hourly data rather than estimated profiles. This is rolling out September 2025 to May 2027.

Why Elexon matters: While Elexon doesn't directly set network charges, they manage the settlement data that underlies accurate billing. The D0018 data flows (profile coefficients) that help estimate when non-half-hourly customers use electricity come through Elexon's systems.