‘Of which’ items
Night-time use, production and various types of green power are ‘of which’ items, meaning that the quantity entered for these items should be equal to or smaller than the total quantity of electricity that was purchased. They do not affect the environmental score or the CO2 balance, but are used for calculating the efficiency indicators:
- ‘Of which night-time use’ is used, to calculate the ‘off-peak electricity use’ key indicator.
- ’Of which production’ is used to calculate a number of key indicators.
- ’Of which for heatpumps’ is used to calculate:
- Electricity excl. heatpump per floor area
- Seasonal Performance Factor heatpump
- ’Of which for charging vehicles (grey/green)’ does not affect the environmental score or the CO2 balance. It is used, however to correct the indicator for electricity per floor area and for building related energy.
- ‘Of which green power’ does result in a decreased environmental burden. The decrease depends on the type of green power.
In finetuning you can choose from various types of green power. Green power from old hydropowerplants is (as of january 2015) treated like ‘conventional electricity’ because it does not reduce the environmental burden.
Electricity from diesel engine
If you are using an electricity generator (at festivals, outdoor activities or emergency power facilities) you can enter the amount of diesel used under the item ‘electricity from diesel generator’. You can choose from three efficiencies. If you do not know the efficiency of your generator/generator, assume 30 % efficiency.
If you have a CHP installation, a windmill, solar cells or other sources of self-generated power, activate (via finetuning) the necessary items for ‘self-generated power’, so that you will be able to enter the data in the Envirometer.
Returned green power
Do you return green electricity (from solar or wind energy) to the electricity grid? You can enter that in two ways:
- Enter the net electricity consumption under ‘purchased electricity’ (purchased minus returned).
- Enter the electricity purchased under ‘purchased electricity’ and the returned electricity under ‘returned electricity’.
Do you return green electricity (from solar or wind energy) to the electricity grid?
- Fill in ‘purchased electricity’ and ‘returned electricity’. Entering returned electricity ensures that your key figures for electricity use are correct. As of april 2022 ‘returned electricity’ has no effect on your CO2 footprint and Environmental Score. You can read more about this (in Dutch) on this page: Teruggeleverde stroom levert geen CO2-aftrek.
- You can also enter the net power consumption under ‘purchased electricity’ (= purchased minus returned). This yields the same result for the key figures, but not for the CO2 footprint. You then introduce a CO2 deduction for the returned electricity. Entering net power consumption is therfore not in line with the GreenHouseGas Protocol.
Power from cogeneration or combined heat and power (CHP)
|Generation/use||Theme||Environmental theme||Environmental burden||Key indicators|
|Gas use of CHP||Fuels & heat||Natural gas for CHP|
|Generated heat||Fuels||Self-generated heat|
|Any heat provided to others||Fuels||Heat provided by third parties (negative number)|
|Generated power||Power||Self-generated power|
|Generation CHP > electricity consumed||Fuels & heat||Delived to the grid from CHP1|
(1) This reduced the environmental impact of the theme Fuels & heat in the environmental burden (charts) and CO2-footprint.
- You purchase 10.000 kWh electricity
- You purchase Green electricity
- You produce 10.000 kWh in your CHP
- You return 1.000 kWh to the net
- Enter this:
- Purchased electricity: 10.000 kWh
- Of which green electricity: 9000 kWh (= 10.000 kWh – 1.000 kWh)
- Self generated electricity from CHP: 10.000 kWh
- Electricity delivered to the grid from CHP: 1.000 kWh (this item is located under “Fuel & heat”)
Heat pump and Heat Cold Storage
See the fuel fill-in theme how to fill in the energy consumption of a heat pump installation.