Daily operational planning margin requirement (OPMR)
Summary
NESO publishes daily operational planning margin requirement (OPMR) data showing generation capacity needed above demand forecast to meet reserve requirements for 2-13 days ahead. This data release provides operational transparency on system security margins. The publication serves as a market information tool for assessing generation adequacy.
Why it matters
This data release enhances market transparency without changing underlying market mechanisms. As such, it enables better informed commercial decisions but does not address the fundamental issue that operational margins reflect system scarcity that could be priced rather than administered.
Key facts
- •OPMR shows generation needed above demand forecast
- •Published daily for 2-13 days ahead
- •Used for generation availability assessments
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 2-13 days ahead.