I am assuming a BTU of fuel will make so many Wh of energy. If perfectly efficient 1M BTU =292.3 kWh That would cost me $35 from the power utility.
A gallon of diesel is abou $3.25 around here. 139000 btu. Diesel then is about $23 per 1M btu. However diesel engines are only 30% efficient so it will cost me $76 in fuel to make that 292.3 kWh If that assumption is approximately correct: I pay about $7.80 per decatherm in the winter for NG. A decatherm is 1 million btu About half that in summer. $7.80/.3= $26/293.3 kWh for NG not considering depreciation and maint of the generator. It seems to me that NG is the hands down fuel cost winner? Anyone see mistakes in this?
