How much energy is there in biogas?

Each cubic meter of biogas contains the equivalent of 6 kWh of heat energy.

The same volume of biogas converted to electrical power yields 2 kWh; the rest of the energy is dispersed as heat that can be reclaimed and applied to other uses. The 2kWh generated by a cubic meter of biogas can light a 100W bulb for 20 hours, or run a 2000W hair dryer for one hour.