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Understanding out-of-merit dispatch in GB

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Viewing Stage 5— Exclude volumes inaccessible to ENCC (short-notice thresholds)

Skipedia

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Understanding out-of-merit dispatch in GB

Feedback

Viewing Stage 5— Exclude volumes inaccessible to ENCC (short-notice thresholds)

00:00 - 00:30(SP 1)

00:30 →

Market Context

±6 hours

Prices & Imbalance

£85£101-314 MWh

System

Market Index

Imbalance

Generation & Margin

25.9 GW17.0 GW

Wind

Solar

Gas

Nuclear

Margin

Cost of Skips

£141

#44/48today

#44/4830d

Units Skipped

with skip cost this SP

Battery Share

£0 of £141

Frequency & Acceptances

00:0000:1500:00

mHz σ

Stack

0 1 2 3 4 5

Offers(turn up)

Bids(turn down)

Offers(turn up)

Actual Dispatch

What was actually dispatched vs the merit order above. Shows accepted, skipped, and out-of-merit (favoured) units.

Offers(turn up)

Aggregator

Battery

CCGT

Pumped Storage

Wind

Optimal

Most expensive

Exclude ENCC-Inaccessible

Exclude volumes not accessible to the Control Room

Units with MZT/MNZT/NDZ ≥31 minutes (and not running) and volumes outside SEL-MEL/SIL-MIL ranges. What remains are unexplained skips.

Most Skipped Units

2 units ranked by skip cost per MWh skipped

#	Unit	Technology	Region	Skipped	£/MWh

1	Coryton	CCGT	SE	10 MWh	£1.68
2	West Burton B 2	CCGT	EMids	75 MWh	£1.67