Gas-fired engine power plants provide a new, alternative energy source for data centers. Large internal combustion engines offer highly efficient, sustainable and cost-effective power – and replace back-up diesel generators. Redundant engine capacity can be used to sell electricity to the grid, opening a new business model for data center operators. Thanks to the high efficiency of the gas engines, they provide power to the data center at lower price than grid electricity. In addition, switching to natural gas can significantly reduce the carbon footprint of a data center.