With lawmakers struggling to rein in national carbon emissions, Capitol Hill's own power plant remains the worst carbon emitter in D.C., experts say. Lawmakers have been trying to switch the plant, which provides energy for Congress, the Supreme Court and other federal buildings, to eco-friendly fuels since the turn of the century, but it's still run chiefly on diesel. While modernizations would cost several million dollars, converting the plant to run on natural gas could halve energy costs, this article says.

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