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.

System Operability Framework (SOF)

The System Operability Framework (SOF) takes a holistic view of the changing energy landscape to assess the future operation of Britain's electricity networks. The SOF combines insight from the Future Energy Scenarios with a programme of technical assessments to identify medium-term and long-term requirements for operability.

Evolving year-on-year 

Through extensive industry interaction, the SOF evolves year‑on‑year to meet changing operational and stakeholder needs.

Growth of low carbon and renewable generation, closures of conventional thermal power stations and changing interactions across the whole of the power system are just a few of the areas considered in the context of a rapidly changing power system.

Regional Trends and Insights

Changes in the generation and demand are effecting how the power system is operated on a regional basis.

Find out about our latest analysis by downloading the report.

Download the regional trends and insights document

Voltage and Frequency Dependency 

Traditionally, voltage and frequency have been treated independently when considering operability. In the future, they will interact more.

Find out about our latest analysis by downloading the report.

Download the voltage and frequency document

Past SOF documents