(1) Pfossil, which captures the price of fossile fuels or, more
correctly, the system costs of the best alternative fuel, in
most cases energy systems using oil, coal or natural gas.
The higher Pfos~il, the more competitive is biomass energy
and the higher Dbi o.
(2) TAXfossi ~, which captures the difference in taxation
between fossil and biomass energy. In many countries
fossil energy is already taxed at a higher rate than biomass
energy. The higher TAXfossil, the higher Dbi o.