Entering data on electricity
On the page enter data you will find general information about filling in an Envirometer and how to operate the entry screen. Below, you will find specific information about entering data on electricity. In finetuning you can select which items are shown in your Envirometer.
‘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 calculat:
- 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.
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 Sun or Wind) to the electricity grid? You can enter that in two ways, it has the same effect:
- 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'.
Note: if you purchase green electricity, only the net electricity (purchased minus returned) is green.
Note: if you supply more power than you buy, you are an electricity supplier. In this case, you will get a negative CO2 emission for electricity in your CO2 footprint. It may be argued that this electricity production is outside the scope you want tot include in your footprint. Do you want to prevent this? Enter exactly the amount of purchased electricity as returned electricity.
Power from cogeneration or combined heat and power (CHP)
- Enter the gas use of the WKK at ‘Fuels, natural gas for CHP’. This will count towards the environmental burden (charts) and key indicators.
- Enter the generated heat at ‘fuels, self-generated heat’. This will NOT add to the environmental burden (charts), but it WILL count towards the key indicators.
- Enter any heat provided to others at ‘fuels, heat provided by third parties’ as a NEGATIVE number. This will count towards the environmental burden (charts) and key indicators.
- Enter the generated power at ‘power, self-generated power’. This will NOT add to the environmental burden (charts), but it WILL count for the key indicators.
- If the CHP produces more electricity than is consumed, power will be sold back. Include this in the envirometer by activating the item Electricity delivered to the grid from CHP. You find this under fuel & heat. This reduces the environmental impact of the theme fuel & heat in the charts and CO2-footprint.
- For example:
- You purchase Green electricity
- You purchase 10.000 kWh 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")