Implementation of Market-wide Half Hourly Settlement (MHHS) Arrangements
Summary
This Authority Change Proposal was raised by Ofgem pursuant to the Electricity Settlement Reform SCR. It will ensure that the appropriate obligations, processes and provisions for the new MHHS arrangements, which have been developed and consulted on as part of the MHHS Programme, are introduced into the REC.
Latest update and next planned activity
Date of latest update
Latest Update
22/09/25 - This Change Proposal has been implemented as part of the MHHS M8 22 September 2025 REC Release.
Impacts Overview
Priority and rationale
Priority last updated on 29 May 2026
Solution development
Problem Statement
Changes are required to the REC, to ensure that the appropriate obligations, processes and provisions are defined within the REC at MHHS go-live, to enable the successful transition to the enduring governance and operational arrangements developed as part of the MHHS Programme.
No documents available.
Change Plan
Proposal Plan approved
Completed
Start:
05 Sep 2024Due:
17 Sep 2024Completion:
17 Sep 2024Consultation published
Completed
Start:
17 Sep 2024Due:
18 Sep 2024Completion:
18 Sep 2024Consultation closed
In Progress
Start:
18 Sep 2024Due:
09 Oct 2024Completion:
Final Recommendation Vote
Not Started
Start:
09 Oct 2024Due:
05 Nov 2024Completion:
Issued for Authority Determination
Not Started
Start:
05 Nov 2024Due:
07 Nov 2024Completion:
Original submission
Change details
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5 Sep 2024
Change details
Implementation of Market-wide Half Hourly Settlement (MHHS) Arrangements
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Impacts
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Priority & timing
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Activity
Implementation Date has been updated to MHHS Programme Milestone M8 (Code changes delivered).
harriet.truss has been allocated as Lead Analyst.
beth.brown, vaishnsharma have been allocated as SME.