Tswaing Wetlands - The Fallen One
This old tree counts among the fallen ones It is amazing how much energy is stored in wood form durin the growth period of these trees.
Wikipedia has the following to say:
Energy content
A common hardwood, red oak, has an energy content (Heat value) of 14.9 megajoules per kilogram, and 10.4 megajoules recoverable if burned at 70% efficiency.
The Sustainable Energy Development Office (SEDO), part of the Government of Western Australia states that the energy content of wood is 16.2 megajoules per kilogram (4.5 kWh/kg).
According to The Bioenergy Knowledge Centre, the energy content of wood is more closely related to its moisture content than its species. The energy content improves as moisture content decreases.
In 2008, wood for fuel cost $15.15 per 1 million BTUs (0.041 EUR per kWh).