How to use the Calculators - Here is an example

You are living in a village with 1000 households. Use the 'Household Energy Demand' calculator to estimate the approximate annual use of electricity and heat. It shows that each year 1000 MWh electricity is needed and 12000 MWh heat for hot water and heating is needed. Thus a total of 13000 MWh/year.

Calculators

How to use the calculators

Household Energy Demand

Conversion of Energy 

Conversion of Renewable Energy Sources 

Optimize Size of Biofuel Boiler 

You can then use the calculator 'Conversion of Energy' to see how these 13000 MWh can be produced. We could estimate that the energy is now produced from Mazut - this needs 1161 ton of Mazut. Alternatively, as the table shows, 5000 ton wood chips may produce the same amount of energy. Or 3250 ton straw.

Alternatively, you can look at the calculator: 'Conversion of Renewable Energy Sources'. It shows that 13000 ha of forest or 1100 ha of straw is needed to produce 13000 MWh of energy.
With 24000 m2 of solar panels (24 m2 per household) and one 1MW windmill this village's need for heat and electricity could also be covered.

Finally, we can estimate the cost and effect for a district heating plant, which wants to convert from a boiler fired by mazut, oil and gas to a wood fired boiler using the 'Optimize size of wood boiler' calculator.
Once you enter the demand - 12000 MWh of heat - you see that with a guess of a 1 MW boiler, the efficiency will not be optimal. The graph shows that the old boiler would still have to be used over the entire year.
The calculator provides you with the optimal size of the boiler: 2 MW. This will allow for a restricted use of the old boiler to the peak demand period. The payback period will be only 2 years.
Furthermore, you also notice, that CO2 emission is reduced with 99%.