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Grass-roots efforts to bring more solar energy to Stow will take one step forward Sunday and next weekend with demonstrations of how a power-generating installation works. Residents are invited to the home of Ann Deluty at 51 Birch Hill Road from 10 a.m. to 4 p.m. Sunday to see her solar system. Another gathering is slated for Saturday from 10 a.m. to 4 p.m. at Jack Zettler’s home at 52 Barton Road.