Glossary
Grid frequency
the AC grid's frequency in hertz; GB targets 50.00 Hz. It rises when generation exceeds demand and falls when demand exceeds it, so it's a live balance signal. Statutory limits 49.5-50.5 Hz; operational target ±0.2. Elexon dataset: FREQ (via /system/frequency, ~15-second cadence).
More terms
- Balancing Mechanism (BM)
- BESS
- BM Unit (BMU)
- BMRS
- Carbon intensity
- CCGT / OCGT
- Curtailment
- DNO region
- Elexon
- Embedded (distributed) generation
- GB vs UK
- Generation mix
- Imbalance / cash-out price
- INDO / NDF
- Interconnector
- ITSDO / TSDF
- Metered / transmission-connected
- MID
- NESO
- NIV (Net Imbalance Volume)
- PN (Physical Notification)
- PS / NPSHYD
- PV Live
- REMIT
- REPD
- Settlement period