The town has scrapped plans to build a 500-kilowatt facility on a gravel pit on town-owned land because the state-issued land-use permit for the property had lapsed, officials said. Town Manager Willis Stearns said the plans for the five-acre property off Route 103 were put on hold indefinitely because the town could not apply for an extension of the Act 250 land-use permit if there were plans to alter the use of the pit with a solar construction project. ‘‘And so to not hold up that Act 250 process, we pulled the whole idea of solar panels because we had no commitments made to be able to say definitively . . . this is the product that will be there,’’ Stearns told the Eagle-Times.