When will Market-wide Half-Hourly Settlement (MHHS) be introduced?

MHHS is being introduced in phases across the UK:

• 2025 – Central industry systems go live and migration begins
• 2026 – Most customers move to MHHS
• 2027 – Industry-wide migration is completed

Corona Energy will begin migrating customers from 16 September 2026, with migrations continuing through to May 2027.

You do not need to take any action at this stage. We’ll manage the migration process and keep you informed throughout.

We’ll contact you before your migration date and let you know if any action is required.