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The lower heating value of propane is about 45 megajoules per kilogram (MJ/kg). A "20 pound" portable propane tank holds about 18 pounds, or about 8 kg of propane, so the the heating value is somewhere around 360 MJ. A megawatt-hour is one megawatt for an hour, or 3600 megawatt-seconds, which is the same as saying 3600 MJ. So a tank of propane has a raw energy equivalent of about 0.1 MW-hr, or 100 kW-hr. If you're talking about turning it into electricity, that's a different matter. Internal combustion engines typically have a thermodynamic efficiency of around 30%, so you can't get more than about 30 kW-hr out of that much fuel.

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