No.38 of 650 · approved, not built MP: Sir John Whittingdale (Conservative) England

Maldon

Maldon has 139 MW of clean power (all solar) approved and still not built: enough to supply a year's electricity to 50,000 homes. When the wires are too full to carry the power, Britain pays wind farms to switch off instead. No wind farm here is paid that way — almost all of it goes to wind farms in Scotland. That cost is shared across every bill in Britain, so households here pay for it too: about £92 a year per household, £3.8m across the constituency's 41,803 homes. There is also 58 MW of wind running here on the local network. If that gets switched off, no national record shows it. A 100 MW battery was refused planning here in 2022; while discharging it could have supplied about 350,000 homes.

Not visible
here
58 MW of wind is running in this constituency, but it sits on the local network rather than the national grid — so if it is paid to switch off, no national record shows it. That is why this seat has no figure here: not because nothing happens, but because nobody publishes it. The £ figure for this seat is a floor, not a zero.
139 MW
of clean power — all solar — approved and still not built, enough to supply a year's electricity to 50,000 homes — about as many homes as this constituency has. Approved at least two years ago; waiting on the grid, not on planning. That is 2.2× the renewable capacity actually running here.
6 projects · planning database (REPD), July 2026 · how we worked this out
£3.8m
is what the grid gap costs this constituency's 41,803 households in a year between them — £92 each, about 51 days of one home's electricity.
The £92 per household is a national figure — identical in every GB seat. Only the seat total varies, with the number of households · NESO · how we worked this out

The waiting list

4 of 6 waiting projects · years since approval
St Cleres Hall Pit Solar Array 25 MW
4.8 YRS
Hill Farm Solar Park & Battery Storage (Hanningfield Green) 37 MW
4.1 YRS
Canon Barns Road - Solar Photovoltaic Arrays & Battery Storage 50 MW
3.5 YRS
Dengie - Solar PV array 19 MW
2.2 YRS

Every approved, unbuilt project

approved 24+ months ago, still not generating · planning database, July 2026
SiteTechnologyEnough forCapacityApprovedWaiting
Canon Barns Road - Solar Photovoltaic Arrays & Battery StorageSolar Photovoltaics18,000 homes49.9 MW2023-023.5 yrs
Hill Farm Solar Park & Battery Storage (Hanningfield Green)Solar Photovoltaics13,000 homes36.7 MW2022-074.1 yrs
St Cleres Hall Pit Solar ArraySolar Photovoltaics9,100 homes25.0 MW2021-104.8 yrs
Dengie - Solar PV arraySolar Photovoltaics6,900 homes19.0 MW2024-052.2 yrs
Canon Barns Road Solar ParkSolar Photovoltaics2,900 homes8.0 MW2022-014.5 yrs
Sub Zero And Wolf Limited, The Street - Solar PanelsSolar Photovoltaics100 homes0.2 MW2022-103.8 yrs

Plus 3 more approved within the last two years.

Batteries

projects of 10 MW and above · planning database, July 2026 · what batteries do →
SiteSizeStatusWhile discharging
Battlesbridge Bypass, Rettendon - Battery Storage100 MWrefused 2022could supply ≈350,000 homes
Southlands Solar Farm & Battery Storage57 MWapproved, not built 2024could supply ≈200,000 homes
Maldon Hall40 MWapproved, not built 2019could supply ≈140,000 homes

What this page does not show

Smaller wind farms on the local grid are also switched off; national data does not show it, so the £ figure here is a floor, not a zero. Offshore wind is counted nationally, never per seat. The planning database can run a quarter behind reality.

Electricity does not travel from a particular project to particular houses. Everything generated goes into the national grid and everyone draws from that shared pool, so "enough for X homes" is a way of sizing the electricity — not a claim that these homes would be powered by this site. Battery storage is counted separately from generation: it moves power in time rather than making it.

Planning statuses come from the government's planning database (REPD), which records what was decided and when, but not why. Where a project was refused we say so and name the authority; for the reasons, look up the planning reference on that council's own register. How to check any figure on this page →

Read the full method, including everything we cannot see →

What has Sir John Whittingdale said about the grid in Parliament? Search Hansard →

See the full league table Data (JSON)