The proposals are currently being examined by the Planning Inspectorate, with a final decision expected from the Secretary of State for Energy Security and Net Zero, Ed Miliband, later this year.
Campaigners argue that solar panels up to 4.5 metres high could “devastate the Northamptonshire countryside”.
Sarah Bool said: “This development will cover swathes of prime agricultural land in solar panels at a time when we should be prioritising food security as a key tenet of national security.
“The reasons to oppose this development are extensive and the voices of residents loud.”
Stuart Andrew added that the “sheer size and scale” would have a major impact on the countryside and warned of losing agricultural land at a time of global uncertainty.
Green Hill Solar said the farm would “benefit Britain with clean, secure, low-cost energy.”
According to its website, if the solar farm is approved, construction would begin in 2027 with the aim of providing electricity to homes by 2029.