Solar index · GB day-ahead

What a MWh of GB solar earns day-ahead. All solar farms produce in the same midday hours, so prices sag when the sun is out, pulling capture below baseload.

Capture price vs baseload

£/MWh by month · capture rate on the right axis

Today so far

UK day · half-hourly · output at the within-day market price, not the day-ahead index price

Capture rate by year

% of baseload · * part year

The daily shape

Average by UK hour · last 12 months

Cannibalisation

Each dot a month · more output, lower capture rate

Year by year

Calendar years, UK time · * part year

Year	Output	Baseload	Capture	Rate	Neg. hours	Output in neg. hours	Capacity	Load factor	£/MWp/yr

How this index is calculated, every assumption and what is left out: Methodology → Solar, wind and gas indices · data as JSON at /api/v1/indices/solar