WINSLOW — Plans for a commercial-scale solar farm on Heywood Road are on hold after lease negotiations between a utility developer and local farmer fell through. Ranger Solar, a company registered in Delaware with offices in Yarmouth, earlier this year proposed a 10- to 20-megawatt solar station costing up to $25 million – a project that would have been the biggest solar farm in the state. In October, the Winslow Town Council approved regulations on utility-scale solar projects in a move designed to help the project become a reality. Don Eskelund, who owns The Hayman Farm on Heywood Road, said that in mid-May, representatives from Ranger Solar approached him about leasing 100 acres for the project. ‘A CREDIBILITY GAP’ Eskelund said he is a supporter of solar energy and was initially excited about the project.