Ofgem Offtaker of Last Resort Levelisation Process Schedule 2026-2027
Summary
Ofgem has published the Offtaker of Last Resort (OLR) supplier levelisation process schedule for the period of April 1, 2026, to March 31, 2027. This guidance outlines the key dates and deadlines for both periodic and annual levelisation processes, contingent on a Backstop Power Purchase Agreement being in effect.
What changed
Ofgem has released the schedule for the Offtaker of Last Resort (OLR) supplier levelisation process for the 2026-2027 regulatory year. This guidance document details the specific dates for data submissions, invoice issuance, and payment deadlines for both periodic (quarterly) and annual levelisation activities. The process is conditional on the activation of a Backstop Power Purchase Agreement (BPPA) during the preceding OLR year (April 2025 - March 2026).
Regulated entities, specifically energy suppliers involved in the OLR scheme, must review and adhere to the outlined timetables. Key deadlines include the submission of BPPA generation data, payment of invoices, and receipt of credit notices. While this document provides the schedule, further details on the levelisation process requirements are available in the OLR Essential Guide for Suppliers. No specific compliance deadline is stated beyond the schedule itself, and no penalties are mentioned in this guidance.
What to do next
- Review the periodic and annual levelisation timetables for the 2026-2027 OLR year.
- Ensure timely submission of BPPA generation data by the specified deadlines.
- Prepare for and execute payments into the levelisation account by the given dates.
Source document (simplified)
Offtaker of Last Resort levelisation process schedule 2026 to 2027
Publication type: Guidance Publication date:
18 March 2026
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- Below are the dates and deadlines for the Offtaker of Last Resort (OLR) supplier levelisation process for the year 1 April 2026 to 31 March 2027.
The levelisation process will only run if a Backstop Power Purchase Agreement (BPPA) is in effect in the OLR year 1 April 2025 - 31 March 2026. If the OLR process is activated, we will carry out levelisation periodically and annually.
The periodic levelisation schedule for the OLR year 1 April 2026 - 31 March 2027 includes the key dates and deadlines for the levelisation process.
Periodic levelisation timetable
| Quarterly Period | Deadline for submission of BPPA generation data to Ofgem | Date on which Ofgem will send out invoices/ credit notices to all relevant suppliers | Deadline for submitting payments into the levelisation account | Date on which Ofgem will make relevant payments from the levelisation account |
| 1 April - 30 June 2026 | 10 July 2026 | 28 July 2026 | 11 August 2026 | 21 August 2026 |
| 1 July - 30 September 2026 | 16 October 2026 | 30 October 2026 | 13 November 2026 | 27 November 2026 |
| 1 October - 31 December 2026 | 15 January 2027 | 29 January 2027 | 12 February 2027 | 23 February 2027 |
| 1 January - 31 March 2027 | 16 April 2027 | 30 April 2027 | 14 May 2027 | 28 May 2027 |
The schedule for the annual levelisation process includes the key dates and deadlines for the yearly reconciliation process for 1 April 2026 - 31 March 2027.
Annual levelisation timetable
| OLR Year | Deadline for submission of BPPA generation data to Ofgem | Date on which Ofgem will send out invoices/ credit notices to all relevant suppliers | Deadline for submitting payments into the levelisation account | Date on which Ofgem will make relevant payments from the levelisation account |
| 1 April 2026 - 31 March 2027 | 03 August 2027 | 07 September 2027 | 20 September 2027 | 30 September 2027 |
Further information on what is required as part of the levelisation process is available on the OLR Essential Guide for Suppliers.
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