Electricity Consumption in
Households
Jeffrey Galea
Statistician
Environment & Resources Unit
National Statistics Office
Operational Programme I – Cohesion Policy 2007-2013
Investing in Competitiveness for a Better Quality of Life
Project part-financed by the European Union
European Regional Development Fund (ERDF)
Co-financing rate: 85% EU Funds; 15% National Funds
Investing in your future
Presentation Outline
1. Share of electricity consumption in Malta
2. Survey on quantity and type of appliances in
households
3. Technical survey on electricity consumption in
households
Share of Electrical Energy Consumption in Malta
Malta is almost totally
dependent on electrical
energy.
The households’ sector is
one of the largest users of
energy in Malta with
domestic consumption
accounting for around 35
per cent of total electricity
consumption.
Survey on Electricity Consumption in Households
The Survey on Energy Consumption in Households which was
commissioned by the NSO in 2010 adopted a two-tiered approach:
1.) A survey among 1,500 households using CATI technology. The
information collected was about the dwelling characteristics and the type
and number of electrical appliances currently in use. Additional questions
referred to behavioural patterns, energy efficiency, renewable energy
generation and the use of motor vehicles.
2. A technical survey among 60 households which were chosen according
to dwelling type (apartments, maisonettes, terraced houses, estate villas).
After going through a tendering procedure AIS Ltd. was selected to conduct
the survey which entailed the installation of electrical energy consumption
meters to various appliances within the selected households.
The survey was financed through a grant agreement with Eurostat.
The CATI Survey (1)
The Environment and Resources Unit of the NSO prepared the survey
questionnaire whilst the Survey and Methodology Unit was responsible
for conducting the telephone interviews.
Respondents were asked to provide information about:
1.) The number of appliances present in their main dwelling. The
appliances covered included:
• Cookers (Gas/Electric)
• Hobs (Gas/Electric)
• Microwave Ovens
• Air-conditioning Units
• Central Heating Units
• Heaters (Gas/Electric)
• Electrical Water Heaters
• Television Sets
• Fridges
• Freezers
•Dishwashers
• Computers/Laptops
• Washing Machines
• Tumble Dryers
The information requested for electrical water heaters also
included their size and usage pattern.
The CATI Survey (2)
2.) Which of the following appliances are energy efficient:
• Cooker
• Cooker Hob
• Fridge
• Freezer
• Lighting
• Washing Machine
• Air Conditioner
• Dishwasher
• Microwave
3.) Which of the following renewable energy technologies are present
in their main dwelling:
• Solar Water Heaters
• Photovoltaic Panels
• Micro Turbines
4.) The use of motor vehicles and the associated fuel bill per week.
CATI Survey Results: Kitchen Appliances
Chart 1. Kitchen Appliances: Percentage of Total Households
120
99.93
100
87.15
72.16
56.87
60
37.47
34.43
40
18.18
14.89
13.59
20
Appliance Type
fre
ez
er
al
on
e
St
an
d
ith
ou
tf
re
ez
er
Fr
id
ge
s
w
w
ith
f re
ez
er
Fr
id
ge
s
Fr
id
ge
s
as
he
rs
is
hw
D
M
ic
ro
w
av
e
ov
en
s
rh
ob
s
co
ok
e
ob
s
El
ec
tri
c
G
as
co
ok
er
h
ov
en
s
El
ec
tri
c
as
ov
en
s
0
G
Percent
80
85.43
Heating/Cooling Appliances
Chart 2. Heating/Cooling Appliances : Percentage of Total Households
100
90.50
90
77.35
80
Percent
70
60
58.40
50
40
32.66
30
20
9.28
10
0.87
0
Air conditioning
units
Central heating
units
Electric w ater
heaters
Solar w ater
heaters
Appliance Type
Gas heaters
Electric heaters
Other Appliances
Chart 3. Other Appliances: Percentage of total households
120
100
99.01
Percent
80
96.42
66.45
60
40
21.12
20
0
Televisions
Computers/laptops
Washing machines
Appliance Type
Tumble dryers
Energy Efficient Appliances
Chart 4. Energy Efficient Appliances: Percentage of Total Households
40
35.08
35
25.13
25
20
15
10
6.95
5.74
5
6.92
4.49
3.06
0.87
Appliance Type
Dishwasher
Airconditioner
Washing
machine
Microwave
Oven
Stand alone
freezer
Fridge
Cooker hob
0
Oven
Percent
30
Renewable Energy Generation in Households
Availability of renewable energy in
households (%)
Micro turbines
0.1
Solar panels
1.3
Solar water heaters
9.3
Use of Energy Saving Lamps in Households
Chart 5. Use of energy saving lamps by household size (%)
100
98.32
97.51
4
5+
95.30
Percent
95
90
92.18
86.50
85
80
1
2
3
Household size
The Technical Survey (1)
The technical survey was carried out among 60 households, in the Island of
Malta, whose dwellings were categorised as apartments, maisonettes,
terraced houses and estate villas.
Staff from AIS Ltd. visited the selected households and installed energy
consumption meters to as many appliances as possible. The monitored
appliances included:
• Fridges and freezers
• Washing machines
• Dishwashers
• Electrical water heaters
• Electrical ovens/hobs
• Heaters
• Air conditioning units
• Microwave ovens
• Television sets
• Hi-fi equipment
• Computers
• Washing machines
• Tumble dryers
• Solar heaters
• Others
An energy consumption meter was also connected to the main incomer in
order to calculate the energy consumption from lighting (Total energy
consumption – energy consumption by appliances).
The Technical Survey (2)
The survey duration for each household was 30 days, at the end of which
a representative from AIS Ltd. visited the household and took note of the
final readings displayed on each meter.
Data for the energy consumption from the main incomer and permanentlyconnected appliances was recorded on an hourly basis.
The survey was carried out from October 2010 to April 2011. Due to the
seasonal factor the energy consumption of air conditioning units is under
represented.
Measuring Equipment and Installation
Devices
Measuring equipment
Examples of the equipment installation for
the measurement of the electricity flow
Technical Survey Results:
Average Daily Energy Consumption
Table 1. Average Daily consumption in Units
Apartments
Maisonettes
Terraced Houses
Villas
Main Incomer
9.86
10.76
11.02
12.72
Refrigeration
1.94
2.47
2.51
2.46
Water Heating
2.72
2.52
2.87
2.53
TV, HiFi and Computers
1.47
1.60
1.45
1.10
Lighting and Other
3.21
3.15
3.69
4.27
Minor Appliances
0.53
1.03
0.51
2.36
Usage of Electrical Water Heaters
Chart 6. Water Heater Electrical Consumption Trend by Household Siz e
0.8
0.7
0.5
0.4
0.3
0.2
0.1
0
00
:00
01
:00
02
:00
03
:00
04
:00
05
:00
06
:00
07
:00
08
:00
09
:00
10
:00
11
:00
12
:00
13
:00
14
:00
15
:00
16
:00
17
:00
18
:00
19
:00
20
:00
21
:00
22
:00
23
:00
00
:00
No. of Units
0.6
Time
1 Person Household
2 Person Household
3 Person Household
4 Person Household
Apartments
Refrigeration (Fridges
and Freezers)
19.65%
Kettle
0.61%
Lighting and Other
32.56%
Dishw ashers
0.00%
Electric Ovens and
Hobs
2.57%
Pool Pump
0.00%
Microw ave Ovens
0.28%
Solar Heating
0.00%
Tumble Dryer
0.00%
Washing Machines
1.88%
Computers
2.99%
Water Heating
27.54%
Hi-Fi Equipment
0.00%
Televisions
11.93%
Airconditioning
0.00%
Space Heating (non
A/C)
0.00%
Maisonettes
Refrigeration (Fridges
and Freezers)
22.92%
Lighting and Other
29.26%
Kettle
0.79%
Pool Pump
0.00%
Dishw ashers
0.91%
Solar Heating
0.45%
Electric Ovens and
Hobs
1.83%
Tumble Dryer
0.58%
Washing Machines
2.43%
Microw ave Ovens
0.65%
Computers
5.51%
Hi-Fi Equipment
0.10%
Televisions
9.22%
Airconditioning
0.62%
Space Heating (non
A/C)
1.30%
Water Heating
23.44%
Terraced Houses
Ref rigeration (Fridges
and Freezers)
22.77%
Lighting and Other
33.44%
Kettle
1.27%
Dishwashers
0.00%
Pool Pump
0.00%
Electric Ovens and
Hobs
0.51%
Tumble Dryer
0.00%
Solar Heating
0.00%
Microwave Ovens
0.55%
Washing Machines
2.27%
Computers
4.51%
Water Heating
26.04%
Hi-Fi Equipment
0.01%
Televisions
8.61%
Airconditioning
0.00%
Space Heating (non
A/C)
0.01%
Estate Villas
Refrigeration (Fridges
and Freezers)
19.35%
Lighting and Other
33.57%
Kettle
1.49%
Dishw ashers
0.00%
Electric Ovens and
Hobs
2.83%
Microw ave Ovens
0.54%
Pool Pump
8.04%
Water Heating
19.87%
Tumble Dryer
0.18%
Solar Heating
0.00%
Washing Machines
2.61%
Computers
1.31%
Hi-Fi Equipment
0.18%
Televisions
7.19%
Space Heating (non
A/C)
2.82%
Airconditioning
0.00%
Overall Maltese Households
Refrigeration (Fridges
and Freezers)
21.65%
Lighting and Other
32.08%
Kettle
1.11%
Dishw ashers
0.28%
Electric Ovens and
Hobs
1.70%
Microw ave Ovens
0.55%
Pool Pump
1.97%
Tumble Dryer
0.23%
Solar Heating
0.14%
Water Heating
23.88%
Washing Machines
2.36%
Computers
3.88%
Hi-Fi Equipment
0.08%
Televisions
8.80%
Space Heating (non
A/C)
Airconditioning
1.10%
0.19%
Thank you