TABLE FOR CALCULATING
NEGAWATTS
DEFAULT VALUES OF ENERGY CONSUMPTION
The energy saving potential of potential activities and measures along with the replacement of fossil
fuel based energy with renewable energy (and the reduction of negative environmental impact due
to more efficient and environmentally friendly consumption) is expressed as the reduction in energy
consumption related to making daily activities such as the use of living and office spaces, transportation, eating and leisure activities more environmentally friendly. By replacing a more energy-intensive
activity with a more efficient activity, great efficiency can be achieved. By sharing space, devices and
equipment with peers instead of using everything individually, it is possible to increase the efficiency
of their use and reduce resource and energy consumption.
The energy cost of major consumption-related activities (that can be measured in terms of energy
consumption) can be calculated and expressed as kilowatt-hours, either as a unit characterizing an
activity (volume, level) or the annual consumption of an individual activity or the whole complex of
activities (or a project).
For calculating the energy saving potential of a project, we recommend using the indicators and default values listed in the table below. The list of default values for energy saving potentials has been
compiled by SEI Tallinn Centre using public energy consumption figures for products and services and
simplifying and adapting these figures to the Estonian patterns of consumption and the objectives of
this competition.
DEFAULT VALUES OF ENERGY CONSUMPTION
PATTERN OF CONSUMPTION/
ACTIVITY
Unit
Estimated
annual
consumption
per person
Consumed
fossil energy
in kWh
per unit
Consumed
fossil energy
per person
per year
(kWh)
Paper (printed on one side)
(10 page per working day, 240 working days in a year)
pages
2,400
0.111
266
Paper made of 100% recycled materials
(Printed on one side) (10 pages per working day)
pages
2,400
0.065
157
Paper (printed on both sides) (10 pages per working day)
pages
2,400
0.056
135
Paper made of 100% recycled materials
(Printed on both sides) (10 pages per working day)
pages
2,400
0.034
81
Cardboard coffee cup (1 cup per day, 365 days a year)
cup
365
0.34
124
Polystyrene coffee cup (1 cup of tea/coffee per day)
cup
365
0.83
303
Ceramic cup (1 cup of tea/coffee per day)
cup
365
0.03
11
RESOURCES/CONSUMABLES
PATTERN OF CONSUMPTION/
ACTIVITY
Unit
Estimated
annual
consumption
per person
Consumed
fossil energy
in kWh
per unit
Consumed
fossil energy
per person
per year
(kWh)
Lunch containing meat (1 portion per day)
portion
365
8.9
3,248
Lunch containing no meat (1 portion per day)
portion
365
1.52
555
Juice produced in Estonia (0.25 l / 1 glass per day)
glass
365
0.85
310
Imported juice (produced in Europe) (0.25 l per day)
glass
365
1.26
460
Tap water (2 l per day)
litre
730
0.001
0.73
Bottled water (2 l per day)
litre
730
0.606
442
Fridge + freezer / combo fridge
kWh/year
202
438
190
Freezer
kWh/year
216
216
203
Coffee machine (15 minutes per day + 1 h heating)
kWh/year
167
362
159
Dishwasher
kWh/year
255
553
240
Electric cooker
kWh/year
340
737
320
Laser printer
kWh/year
93
202
88
Ink printer
kWh/year
39
84
37
Desktop computer (8 h/day)
kWh/year
336
728
728
Laptop (8 h/day)
kWh/year
57.6
125
125
Washing machine (8 h/day)
kWh/year
190
412
179
LED or LCD TV (4 h/day)
kWh/year
53
115
50
Plasma TV (4 h/day)
kWh/year
136
295
128
Vacuum cleaner
kWh/year
93
202
88
Microwave oven
kWh/year
135
293
127
Home cinema system (4 h/day)
kWh/year
88
191
83
Average consumption of electrical energy
kWh/m²/year
30
65
888
Average consumption of energy
on 100% renewable electricity
kWh/m²/year
6
13
178
Vending machine for drinks
kWh/year
3,500
7,587
7,587/
number of
users
Vending machine for food
kWh/year
3,070
6,655
6,655/
number of
users
Vending machine for coffee
kWh/year
2,200
4,769
4,769/
number of
users
Copy machine
kWh/year
3,420
7,414
7,414/
number of
users
FOOD
ELECTRICAL APPLIANCES AT HOME
ELECTRICAL APPLIANCES AT THE UNIVERSITY
PATTERN OF CONSUMPTION/
ACTIVITY
Unit
Estimated
annual
consumption
per person
Consumed
fossil energy
in kWh
per unit
Consumed
fossil energy
per person
per year
(kWh)
Incandescent lamp, 60W (lit 4 hours per day)
kWh/day
0.24
0.52
190
Fluorescent lamp, 11W
kWh/day
0.044
0.095
36
Halogen lamp, 30W
kWh
0.12
0.26
95
LED lamp, 6W
kWh
0.024
0.052
19
Average household energy use for lighting
kWh/m²/year
30
65
888
Average household energy use for lighting,
100% renewable electricity
kWh/m²/year
6
13
178
Detached home, electric heating
kWh/m²/year
98
212
2,900
Detached home, electric heating,
100% renewable electricity
kWh/m²/year
20
43
592
Detached home, ground-source heat pump
kWh/m²/year
35
76
1,036
Detached home, ground-source heat pump,
100% renewable electricity
kWh/m²/year
7
15
207
Multi-storey apartment building, central heating
kWh/m²/year
148
321
4,380
Office, central heating
kWh/m²/year
167
362
5,430
Office, electric heating
kWh/m²/year
167
362
5,430
Office, electric heating, 100% renewable electricity
kWh/m²/year
34
74
1,106
Average household energy use for heating water
kWh/m²/year
31
67
915
Average household energy use for heating water,
100% renewable electricity
kWh/m²/year
6
13
178
On foot
km/day
14
0
0
Bicycle
km/day
30
0
0
Motorcycle/moped, 1 passenger
km/day
30
3.0
3,000
Car, class A, 1 passenger in the car
km/day
55
4.0
8,000
Car, class B, 1 passenger in the car
km/day
55
4.5
9,000
Car on average, 1 passenger in the car
km/day
55
7.0
14,000
Public transportation (bus/tram/trolleybus),
per passenger
km/day
55
0.17
280
Train, per passenger
km/day
55
0.085
140
Electric car, 1 passenger in the car
km/day
55
18
6,528
Electric car, 100% renewable electricity, 1 passenger
km/day
55
3.6
1,314
LIGHTING
HEATING
WATER HEATING
TRANSPORTATION
PATTERN OF CONSUMPTION/
ACTIVITY
Unit
Estimated
annual
consumption
per person
Consumed
fossil energy
in kWh
per unit
Consumed
fossil energy
per person
per year
(kWh)
Car
kWh/t-km
465
465
*quantity
Car, 100 % biofuel/renewable electricity
kWh/t-km
93
93
*quantity
Train
kWh/t-km
291
291
*quantity
Ship
kWh/t-km
116
116
*quantity
Plane
kWh/t-km
2,210
2,210
*quantity
Energy consumption of educational
institutions per employee
kWh/m²/year
250
542
11,920
Energy consumption of stores per employee
kWh/m²/year
500
1,084
22,760
Energy consumption of a food establishment
or hotel per employee
kWh/m²/year
350
759
28,180
Average energy consumption of an office per employee
kWh/m²/year
280
607
17,340
TRANSPORTATION
OTHER SERVICES/ACTIVITIES
Notes:
If fossil fuel-based electricity is replaced by energy from renewable sources, a coefficient of 0.2 is applied to the calculation of the
energy consumption; the ratio of end-use and consumption of primary energy in Estonia is 2.1678 (Eurostat, data from 2011).
Finding default values for sources used:
● Household indicators http://www.stat.ee/65361
● Indicators for passenger car energy consumption
http://www.simi.ie/consumer+information/environment/co2+emissions+guide.html
● Indicators for energy use in transportation http://lipasto.vtt.fi/yksikkopaastot/henkiloliikennee/tieliikennee/henkilo_tiee.htm
● Indicators for energy consumption of buildings, SEIT calculations based on Finish indicators
● Average energy consumption indicators of the service sector, data from ENERDATA
http://www.odyssee-indicators.org/reports/sectors_services_eu27.php
● Indicators for the energy consumption of paper: Newsletter of the Environmental Paper Network, June 2007
http://environmentalpaper.org/documents/recycled-fiber-fact-sheet.pdf
● Energy consumption indicators for bottled water: http://www.bieroundtable.com/files/bottled%20water%20final%20dep.pdf
● Energy consumption indicators for tap water: http://www.theguardian.com/environment/2007/aug/02/ethicalliving.ethicalliving
● Converting CO2 emission into kWh: http://www.carbonfund.org/how-we-calculate
● Energy consumption indicators for cardboard and polystyrene coffee cups and ceramic cups: Refiller, B. Lifecycle Assessment:
reusable mugs vs. disposable cups. 2013
USEFUL READINGS FOR THE PARTICIPANTS
●
www.odyssee-indicators.org
●
www.energiatark.ee
●
www.energia.ee
●
www.whatsmycarbonfootprint.com
●
www.carbonfund.org