Weekly operational planning margin requirement (OPMR)
Summary
NESO publishes weekly operational planning margin requirements (OPMR), which set the generation capacity needed above demand forecast to meet reserve requirements. The data covers 2-52 weeks ahead and forms part of generation adequacy assessments. This is a routine data publication that provides market participants with NESO's operational planning assumptions.
Why it matters
Provides transparency on NESO's operational planning but does not change market rules or costs. As such, this is informational rather than structural — useful for generators and suppliers planning operations but not a policy change.
Key facts
- •OPMR data published weekly
- •Covers 2-52 weeks ahead
- •Shows generation capacity needed above demand forecast
- •Published since 2019
Areas affected
Memo
OPMR is the amount of generation exceeding the demand forecast needed to meet our reserve requirement. When assessing and publishing generation availability information against system requirements, the ESO includes an OPMR above demand forecast for 2-52 weeks ahead.