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Electric utilities, which designed their system to meet peak demand in sizzling weather, are straining to keep up during the cold.Electric utilities, which designed their system to meet peak demand in sizzling weather, are straining to keep up during the cold.http://www.nytimes.com/namespaces/keywords/desSeasons and Monthshttp://www.nytimes.com/namespaces/keywords/desNatural Gashttp://www.nytimes.com/namespaces/keywords/desGreenhouse Gas Emissionshttp://www.nytimes.com/namespaces/keywords/deshttp://www.nytimes.com/namespaces/keywords/nyt_geoMid-Atlantic States (US)Electric Light and Power