L. David Roper
6 April, 2016
The fits given here involve fitting the hyperbolic-tangent function,
by varying its three parameters to the estimated solar-photovoltaic-energy consumed in Terrawatt-hours each year.
Geothermal energy is in such an early stage of exponential growth that fitting the yearly data does not determined the eventual amount to be produced. Using the 32 TW availability given in Ref. 3 above and assuming that about 25% of it can be developed, the asymptote of 70,000 TWh/year is used in the fit given below.
This shows the fit to the geothermal-energy data for an asymptotic value of 70,000 Terrawatt-hours per year.
This shows the projection of the fit into the future and compares the projection to the energy available from fossil fuels. The crossover year is about 2060.
A rough estimate of the future availability of geothermal energy is given.
World Renewable Energy
L. David Roper Interdisplinary Studies