A huge solar farm would interfere with radar at one of the UK's main airbases, the Ministry of Defence (MoD) has warned.
It has objected to plans for the land near RAF Marham in Norfolk, arguing that metal solar panels would cause interference when aircraft approach.
The Droves, which would cover the equivalent of 1,175 football pitches, is one of the largest solar farms planned for the UK.
The firm developing the plan, Island Green Power (IGP), said it was working with the MoD and it was confident the issue could be resolved.
The 2,075-acre development would be built on farmland close to Swaffham and IGP has said it would generate up to 500 megawatts of electricity — enough to power about 115,000 homes annually.
The government – which has the final say on the development – has been inviting comments on the proposals.
They have been controversial, with the likes of sculptor Antony Gormley describing the impact on the countryside as "cruel and destructive".
The nearby RAF Marham is one of the UK's main airbases and in its objection, the MoD warned metal solar arrays would interfere with its radar system.
This would impact "upon its ability to accurately detect and track aircraft during critical stages of their approach", said Christopher Waldren, representing the MoD in a written response.
Waldren added the MoD would need to be consulted over proposed new pylons, while a "management plan" would need to be drawn up because of concerns over glare from solar panels.
IGP's project development manager, Harman Sond, said the firm was working with the MoD on the radar issue "with the aim of identifying an appropriate solution".
"We are confident this matter can be resolved through ongoing discussions," he added.
"We have also assessed potential glint and glare effects and are considering appropriate mitigation measures."
Large solar farms are a major part of the government's plans to transition to green power, with the aim of tackling climate change and making the UK less reliant on foreign energy.
Because of the scale of such projects, it will decide on planning permission for them, rather than local authorities.
The first public hearings into the plan for The Droves are due to take place in King's Lynn next week.
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The applicant says the solar farm could provide enough electricity to power about 16,580 homes.
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The developer says it will analyse the responses and any more to come before the 15 May deadline.
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