Solar-powered homes around the state are opening their doors to the public Saturday in an effort to spread the word about alternative energy and cool the planet.

It’s part of the 12th annual National Solar Tour sponsored by the American Solar Energy Society. Thousands of people across the country are expected to tour green homes in their own areas to see how neighbors are using clean energy and reducing fuel bills.

There are dozens of homes and buildings to visit around Maine, including at least 12 in the southern Maine communities between Kennebunkport, South Berwick and Freeport. Tours also will be offered at offices and educational buildings in the Portland area.

The Northeast Sustainable Energy Association, Energyworks LLC and the Maine Solar Energy Association are part of the effort and have posted information on open houses around the state.

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