We are becoming a separate company

In April 2019, the Electricity System Operator is becoming a separate company within the National Grid Group. Find out more about what this change will mean.

Forecast volumes and costs

On this page we provide a breakdown of operating margin (OPMR), based on forecast volume of reserve, forecast volume of frequency response required, annual weighting factors for STOR contracts, and forecasts of BSUoS charges.

Frequency response requirement documents are now on the System balancing reports page.

You can find out more about the balancing services incentive scheme (BSIS) and balancing services use of system (BSUoS) on their respective pages.

BSUoS

Margin requirements

NRAPM forecast

The purpose of the Negative Reserve Active Power Margin (NRAPM) forecasting report is to indicate to the market a risk of NRAPM situation and therefore risk of Emergency Instructions.