PDA Pillar 02 · Curtailment & Congestion

Probabilistic Dispatch Assessment.

Half-hour security-constrained dispatch — across the full year, with the grid as a first-class constraint.

An SCED solver that minimises system cost under thermal, voltage and N-1 security limits. PTDF sensitivities trigger redispatch the moment a circuit binds — batteries, electrolysers and interconnectors all co-optimised in the same envelope.

SCED · 30-min resolutionPTDF-driven redispatchSector coupling · H₂ + BESSInterconnector co-optimisation
17,520Settlement periods / yr
£48System cost · /MWh
14.2 TWhRedispatch volume / yr
+21 TWhNet interconnector import
The signature output

The generation stack, resolved every half hour.

A representative week of security-constrained dispatch. When a monitored circuit binds, SCED chooses the cheapest redispatch over involuntary load-shed — every time.

Generation mix · representative week · half-hour SCED · Net-Zero scenario
Pillar-2 read · SCED chooses redispatch over load-shedding every time. Slack signals show where new transmission, flex or interconnection pays back fastest.
Inside the engine

Four stages, one optimisation envelope.

01

SCED solver

Linearised optimal generation mix at half-hour resolution — thermal, voltage and N-1 limits enforced.

02

PTDF redispatch

Auto-triggered on overload: the cheapest re-shuffle of injections, with no involuntary load-shed.

03

Sector coupling

BESS, hydrogen electrolysers and demand-side response co-dispatched in the same solve.

04

Interconnector co-opt

Cross-border flows optimised alongside domestic generation across all scenarios.

The read

SCED chooses redispatch over load-shedding every time — and the slack variables emit precise signals on where new transmission, flex or interconnection pays back fastest.