Glossary Term: Half Hourly Generation by Fuel Type
National Grid measure system generation connected to the high voltage transmission system in real-time from operational metering. This is used in control timescales to assist with balancing the system and confirming that generators are operating at their expected levels. To provide market participants with information relating to the levels of generation, this metering is aggregated into fuel type categories. The data is provided as half hourly averages in MW.