Metrics Glossary

Definitions of all data points we provide

Understanding what each metric means is essential for using our API effectively. Click on any term for a detailed explanation, formula, and API endpoint.

Prices

System Price

The imbalance cash-out price (SSP/SBP)

Day-Ahead Price

Auction price set the day before delivery

Capture Price

Volume-weighted average for a technology

Shape Factor

Capture Price ÷ Baseload Price ratio

Carbon & Emissions

Carbon Intensity

Grams of CO2 per kWh of electricity

Fuel Mix

Percentage breakdown by generation source

Generation

Wind Generation

Real-time and forecast wind output

Solar Generation

Real-time and forecast solar output

Quick Reference

Metric	Unit	Source	Update Frequency
System Price	£/MWh	Elexon BMRS	Half-hourly
Carbon Intensity	gCO2/kWh	National Grid ESO	Half-hourly
Fuel Mix	%	National Grid ESO	5 minutes
Capture Price	£/MWh	Calculated	Daily
Shape Factor	ratio	Calculated	Daily