Agile Rates South West England is GSP group L, covering Cornwall, Devon, Somerset, Dorset's western edge and the Bristol area. It is GSP group L, one of the four areas National Grid Electricity Distribution operates, and it has the gentlest evening peak of the 14.
Agile prices are set per distribution area, not nationally. Every half-hour slot comes from the same day-ahead auction, but the rate you pay is that auction put through values specific to your network area. This page sets out the South West's.
South West England has the second-highest multiplier of the 14 areas, but the smallest peak addition at 11p/kWh.
At a wholesale price of 10p/kWh that gives 23.0p/kWh off-peak and 34.0p/kWh during the peak, before VAT and the levy discount.
The formula above stops two steps short of the rate on your bill, and those steps are the same in every region. VAT is applied, and a green-levy discount is subtracted.
Both are currently at temporary values. The UK government's relief on domestic electricity runs from 1 October 2026 to 31 March 2027 inclusive, and for the whole of that window the VAT multiplier is 1.0 rather than the standard 5%, and the green-levy discount is 3.34p/kWh rather than 3.5p/kWh. Outside the window the standard figures apply, and the two worked examples above are quoted before either step.
Its 0.93 transmission-loss multiplier is the lowest in Great Britain, and its 7.14p export peak addition the second-highest.
The same 10p/kWh wholesale price exports at 10.13p/kWh, or 17.27p/kWh during the peak.
Both formulas were last reviewed on .
Octopus Agile is priced per distribution area, so the same wholesale auction produces a different rate in each of Great Britain's 14 GSP groups. The letter in brackets is the region code the site uses in its URLs - /?region=L for South West England, for example. Each region also has a page of its own, listed below.