Methodology: how we measure regional cheapness
Comparing regional Agile prices fairly requires a consistent methodology. The approach used here focuses on average overnight rates for the window between 11pm and 6am, across rolling 12-month periods, to remove seasonal distortion. Summer months see lower generation from wind but higher solar output; winter months bring higher wind and lower solar. Annualising both smooths the variation.
The primary sources for regional Agile historical data are the Octopus Energy public API, which provides downloadable half-hourly price history for each region, and the energy-stats.uk database, which aggregates and presents this data for comparison. Both sources draw from the same underlying Agile product pricing feeds, which Octopus publishes in near real-time.
Overnight rates are used as the primary comparator because they reflect the usable saving window for most households. Peak rates differ more dramatically between regions than overnight rates. But most of the controllable saving, EV charging, dishwasher and washing machine cycles, comes from overnight scheduling. The overnight rate is the rate that most directly determines how much a smart Agile user saves.
The top regions: South Western England and South Scotland
Two regions consistently sit at the cheapest end of the national Agile spectrum over 12-month averages. They are South Western England and South Scotland. The reasons are different in detail but identical in structure: both have abundant local renewable generation relative to local demand.
South Western England covers Cornwall, Devon, and Somerset, the UK's most renewable region by percentage of consumption met from local generation. Offshore wind capacity in the Celtic Sea is expanding rapidly. Existing onshore wind installations across Cornwall and Dartmoor contribute significant overnight generation. Solar capacity in the South West is the highest of any UK region by installed capacity per square kilometre. When multiple generation sources are running simultaneously in periods of low residential demand, the regional overnight price drops sharply.
Average overnight rates in the South West across 2025-2026 have frequently sat in the 2-4p/kWh range. Plunge pricing events, where prices go to zero or below, are more common here than anywhere outside Scotland. An engaged South West household running an EV and flexible appliances overnight can achieve average effective overnight costs well below 3p.
South Scotland is a different kind of renewable powerhouse. Onshore wind generation in the Southern Uplands, across Ayrshire, Argyll, and the Borders, contributes enormous capacity to a region with relatively modest residential demand. South Scotland's generation regularly exceeds its consumption by a factor of two or more on high-wind days. The surplus drives prices down to near-zero or below-zero overnight levels multiple times per week during winter.
For households in South Scotland with EVs or battery storage, the Agile opportunity is extraordinary. Annual savings of £500-600 against the standard price cap are achievable for households that actively shift usage. Overnight effective costs of 1-3p average are realistic across a winter quarter.
Northern England and North Scotland: the wind corridor
Four regions sit just behind the top tier in terms of average overnight cheapness: Yorkshire, North Western England, Northern England, and North Scotland. All four benefit from proximity to large-scale wind generation.
Yorkshire sits directly adjacent to the Hornsea and Dogger Bank wind complexes, currently among the world's largest offshore wind installations. When the North Sea wind blows, Yorkshire regional prices see some of the sharpest overnight drops in England. Average overnight rates in Yorkshire across 2025-2026 have regularly been 2-5p. Plunge events are frequent, particularly in the October to March window when North Sea wind output is highest.
Northern England (the Northern Powergrid region covering Northumberland, Tyne and Wear, County Durham, and Teesside) shares Yorkshire's proximity to North Sea offshore wind and additionally benefits from significant onshore wind capacity in Northumberland. Average overnight rates mirror Yorkshire closely.
North Western England covers Greater Manchester, Lancashire, and Cumbria. Cumbria contributes both onshore wind capacity and hydro generation from the Lake District catchments. Lancashire has substantial onshore wind. The combined effect, on top of the region's relatively modest industrial baseline demand at night, produces consistently competitive overnight rates.
North Scotland deserves specific mention. The Highlands contain some of the highest concentrations of onshore wind capacity anywhere in Europe, plus significant hydro generation from the extensive Highland river systems. Moray Firth offshore wind adds to the surplus. Overnight rates in North Scotland are among the lowest in the UK on an annual average basis, and plunge events here are extremely frequent, sometimes occurring on consecutive nights during stormy winter periods.
The middle pack: most of England and Wales
The majority of English and Welsh regions sit in a reliable middle band. East Midlands, Midlands, Eastern England, East of England, South Wales, and South England all see average overnight rates that are significantly cheaper than the standard tariff cap but somewhat higher than the northern wind corridor.
Typical overnight averages in these regions across 2025-2026 have been in the 4-8p range. That is still a dramatic saving against the 26.11p/kWh standard price cap. A household in the East Midlands running a 60kWh EV overnight at 5p average overnight pays approximately £3 per charge versus £15.66 at the cap rate. The saving is £12.66 per charge, or over £1,300 per year for a household charging twice a week.
South Wales and Eastern England occasionally see cheaper-than-average nights when Welsh and North Sea offshore wind output is high. These regions have enough proximity to generation to benefit from good wind days without sitting in the cheapest tier. Most weeks, they land comfortably in the 4-7p overnight average.
The more expensive regions: London and South East England
London and South East England are the most expensive Agile regions in the UK on rolling average overnight rates. The structural reasons are documented in detail in our companion article on why prices differ by region, but the summary is straightforward: high demand density, minimal local renewable generation, and elevated distribution network maintenance costs.
Average overnight rates in London across 2025-2026 have typically fallen in the 6-12p range. That is higher than the wind corridor regions by 3-8p per unit. It is still dramatically lower than the 26.11p/kWh price cap. A London household with an EV charging overnight at an 8p average pays approximately £4.80 per 60kWh charge versus £15.66 at the cap rate. The saving per charge is still £10.86.
South East England mirrors London closely, with overnight averages typically in the 5-10p range. The South East sees slightly better performance than London on high-wind nights, when South Coast and Eastern Channel wind generation can push local prices down toward the middle band. The structural challenge is the same: high demand, limited local generation, elevated network costs.
An important note for London and South East customers: on exceptional wind days, even these regions see overnight prices fall below 4p. These events are less frequent than in Scotland or the South West, but they do occur. Checking AgileAlert daily for London or South East prices remains worthwhile precisely because exceptional nights do appear, and missing them is leaving money on the table.
Why the gap matters: real pounds per year
The regional price gap is not just an academic comparison. It translates directly into annual bill differences for households at similar engagement levels.
Consider two households with identical usage profiles: a 3,500kWh annual consumption household with an EV, shifting 1,500kWh of flexible load to overnight across the year. One household is in South Scotland. One is in London. Both are fully engaged Agile users checking AgileAlert daily and scheduling all flexible appliances and EV charging to overnight windows.
The South Scotland household, at an average overnight rate of 2-3p for their shifted load, pays approximately £30-45 for those 1,500kWh. Against the 26.11p cap rate, the saving on shifted load alone is approximately £346-362 per year.
The London household, at an average overnight rate of 7-9p for their shifted load, pays approximately £105-135 for those same 1,500kWh. Their saving against the cap is approximately £256-282 per year.
The annual gap between these two engaged households is roughly £80-100. Both are saving significantly. The South Scotland household saves more. But neither household is losing money against the standard tariff. Neither household should be on anything other than Agile.
How wind forecasts affect your region day to day
Regional averages are useful for planning and context. They are not your daily guide. On any given night, the regional hierarchy can shift dramatically depending on wind output, national demand, and grid conditions.
A period of high pressure settled over the UK, bringing warm calm weather, suppresses wind generation nationally. During these periods, even Scotland's overnight prices climb. South Western tidal and solar generation continues, but without the wind contribution, prices across all regions converge upward. The cheapest regions are less cheap. The expensive regions are relatively less disadvantaged.
Conversely, a deep Atlantic storm tracking across Scotland and northern England can push North Scotland, South Scotland, Yorkshire, and Northern England overnight prices to zero or below while London prices remain positive. The regional hierarchy snaps back into its typical form with the arrival of high wind.
This day-to-day variation is why checking AgileAlert every morning matters regardless of your region. If you live in a consistently cheap region, some nights will still be less cheap. If you live in London, some nights will deliver exceptional prices. The habit of checking creates the opportunity regardless of your region's average character.