Hartpury, Rudford and Highleadon parish councils said if the application was approved, it would mean at least 700 acres of farmland would be dedicated to solar farms within a five to 10-mile (eight to 16km) radius.
The councils added that each of the three solar farms proposed in the Newent area would be among the largest five in England.
Newent Town Council raised concerns about overdevelopment, overshadowing of properties, road safety, and the installation of solar panels on land successfully used to grow crops for more than 25 years.
The committee voted to reject the proposals by eight votes to one with one abstention.