Feb 21, 2016 · In general, most electricity is generated from a conventional coal-fired process, whether it be on-site or purchased from a provider. Cost estimates are based on ton-day of refrigeration, where a ton is the heat that needs to be removed to freeze 1 ton per day of water at 32 ⁰F. (via coal boiler) 72% Steam (via gas boiler) 73% Steam
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