Info:
Open the file Exercice_Generation_Electricity.xlsx
Your boss has given you an assignment. He needs you to prepare a comparison of the efficiency of
fossil-fuel power generation in 4 different countries and to assess what is the potential for energy
and CO2 emissions savings for electricity producers.
To achieve this, he asked you to calculate the average efficiency of fossil-fuel electricity-producing
fossil-fuel plants, calculate their fossil-fuel input needs if they were to operate at the best achieved
efficiency and the best technical efficiency. He has given you the data available from the IEA on input
energy and electricity and heat production.
Fill in the cells that are highlighted in yellow. If you put the correct formula, the cell will be
highlighted in green; if not, the cell will be highlighted in red.
Exercise 1:
Click on the worksheet labelled Efficiency and calculate the efficiency of power and heat generation.
1- Calculate the efficiency of electricity generation for main activity producer electricity. (lines 1
to 26)
a. The efficiency of electricity generation in electricity plants is calculated by dividing
the electricity output by the input fuel
b. The conversion rate from GWh to TJ is 3.6 (1 GWh = 3.6 TJ)
2- Calculate the efficiency of electricity and heat generation for main activity producer CHP
plants. (lines 27 to 54)
a. The efficiency of electricity generation in electricity plants is calculated by dividing
the electricity output by the input fuel
b. The conversion rate from GWh to TJ is 3.6 (1 GWh = 3.6 TJ)
c. Output for CHP plants is electricity and heat
3- Calculate the efficiency of electricity and heat generation in electricity and CHP plants
a. The efficiency of electricity and heat generation in electricity and CHP plants is
calculated by dividing the electricity output (converted from GWh to TJ) and the
"adjusted" heat output of electricity and CHP plants by the input fuel in electricity
and CHP plants.
b. How to adjust the heat output? The heat output is adjusted to take into account the
reduction in electricity production per unit of heat extracted. As public CHP is mainly
used to provide district heating, the appropriate substitution factor lies somewhere
between 0.15 and 0.20. You are requested to use an adjustment factor of 0.175 (in
cell B61)
Exercise 2:
Click on the worksheet labelled Energy & CO2 savings
You will calculate how much energy would be saved if all plants in each country would perform at
higher level of efficiency.
There are two values for the “BEST” efficiency: the “low” value is based on the best observed
efficiency worldwide; the “high” value is based on the technical efficiency of plants.
You need to calculate how much energy would have been required if the plants were performing at
the “best value”; the saving is the difference between this calculated input energy and the actual
energy used.
Remember: efficiency = output/input – so input = output/efficiency!
The emissions savings will be automatically calculated using the emission factor in the worksheet
“CO2 emissions”.