Home – Energy – What could become England’s largest solar farm has landed on the energy secretary’s desk, though approval is far from certain
The decision over one of England’s largest proposed solar developments has landed on a new desk. The Planning Inspectorate sent its recommendation on the 500-megawatt Green Hill Solar Farm to the government on July 8, 2026, but Miatta Fahnbulleh replaced Ed Miliband as energy secretary on July 20 and now inherits the anticipated October 8 decision.
Green Hill could generate enough electricity, based on the developer’s annual comparison, for roughly 115,000 homes and pair that output with up to 500 megawatts of battery storage.
But the proposal also reaches across a wide stretch of Northamptonshire and Milton Keynes, making it an early test of how Fahnbulleh balances national clean-power targets against concerns over farmland, rural views, construction traffic and a 60-year industrial footprint.
This is not one neat block of panels tucked behind a hedge. The scheme combines eight solar areas, a separate battery site, substations and underground cables, with the main sites covering about 2,965 acres and the full development order boundary reaching roughly 3,562 acres once the cable corridor and related land are counted.
About 1,359 acres are currently being considered for solar infrastructure, while a cable route of approximately 19.3 miles would connect the sites to the existing Grendon substation. Some tracking panels could reach about 14.8 feet at their highest point, a scale that helps explain why neighboring residents see more than a distant row of glass.
Green Hill was submitted as a Nationally Significant Infrastructure Project and, at 500 megawatts, remains far above England’s current 100-megawatt threshold for large solar developments. Local councils can submit evidence, question the developer and seek conditions, but the secretary of state makes the final decision on the Development Consent Order.
The examination opened on October 21, 2025, and closed on April 10, 2026, after months of hearings and written submissions. More than 1,200 people and businesses reportedly filed comments, along with three local authorities and 14 parish councils.
The inspectors’ recommendation is not yet public because such reports are normally released alongside the government’s final decision. That means the change of energy secretary should not be read as a clue about whether Green Hill will be approved or rejected.
Green Hill Solar says the development would bring Britain “clean, secure, low-cost energy.” Its battery system would store surplus renewable electricity and release it to the national grid when required, including during the busy evening hours when people get home, switch on the lights and start dinner.
The national math is also pressing. The government’s clean-power plan says solar capacity may need to rise from 16.6 gigawatts to between 45 and 47 gigawatts by 2030, with around 60 to 65 percent of projected deployment coming from large commercial projects. In practical terms, Green Hill is exactly the kind of utility-scale development ministers expect to carry much of that load.
Still, the “115,000 homes” figure is an energy-equivalent estimate. It does not mean those households would receive a dedicated supply or a guaranteed reduction in their electric bills, since the project’s output would enter the wider national grid.
Campaigners do not present the dispute as solar power versus fossil fuels. Stop Green Hill Solar says it supports renewable energy but argues that productive farmland, rural views, footpaths and village life would pay too high a price, with one representative warning that the scheme would “devastate our countryside” for decades.
Construction is expected to run from 2027 to 2029 if approval is granted, bringing truck movements, road delays, noise and exhaust before any electricity reaches the grid. Temporary disruption can feel permanent when it passes the front gate every morning. By the examination’s close, however, the applicant said it had agreed traffic assessments and mitigation measures with all three councils and National Highways.
The farmland question is not entirely black and white. The applicant says sheep grazing could continue across most of the sites, but North and West Northamptonshire councils have disputed how the 60-year term is characterized and argued that the loss of higher-quality agricultural land may be understated. That disagreement goes to the heart of the decision.
Green Hill has sometimes been described as a possible record-breaker, but that label is now out of date when measured by generation capacity. The government approved the 800-megawatt Springwell Solar Farm in April 2026 and called it the United Kingdom’s largest power-producing solar farm, while Green Hill would be capped at 500 megawatts.
That does not make Green Hill modest. Its significance comes from the combination of power output, battery storage, scattered sites and a long cable corridor cutting through several rural communities. Size on a planning map can matter as much to neighbors as the number printed in megawatts.
Fahnbulleh must now weigh the inspectors’ report against national energy policy, environmental evidence, local testimony and the legal tests governing major infrastructure. A decision is anticipated by October 8, 2026.
If the order is granted, Green Hill Solar expects construction to begin in 2027 and the development to start supplying the grid in 2029. For the government, the scheme is another piece of the clean-power buildout. For communities around Wellingborough, Northampton and Lavendon, it is the landscape outside the kitchen window.
That is the balance now sitting on Fahnbulleh’s desk.
The official project update was published on Green Hill Solar Farm.
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