This photo gallery is part of a series about global and local efforts to conserve energy and limit pollution through energy efficiency.
GRAM, Denmark — This town of about 2,500 in southern Denmark has found a highly efficient way to heat its homes while limiting the stress on the nation's electrical grid: by capturing and storing energy from the sun.
Built in 2009 and upgraded since, a more than 482,000-square-foot solar field — connected to a massive water storage pit and a network of underground pipes — can meet 60 percent of the town's heating demands.
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Reporting for this series was funded through a Transatlantic Energy and Climate Network fellowship, a project of the nonprofit Heinrich Böll Foundation in Washington, D.C. A complete list of Tribune donors and sponsors can be viewed here.