Duke Energy is spending 50 million dollars to install 10 megawatts of solar panels on customers’ rooftops—I work for a hospital--what are ways my company can reduce our carbon footprint while providing value for consumers without spending

Duke Energy is spending 50 million dollars to install 10 megawatts of solar panels on customers’ rooftops—I work for a hospital--what are ways my company can reduce our carbon footprint while providing value for consumers without spending this kind of money?