By the time Hammarby Sjöstad is fully built the residents will produce half the amount of energy they need. This will be accomplished by e.g. reusing the heat from the purified waste water, and by utilising the energy from the combustible household waste which has been separated at source.
In the area examples of development projects aiming at producing renewable energy locally can be found. The most clearly visible is the integrated technology for utilising solar energy in larger residential buildings.
The energy supplies in Hammarby Sjöstad
The main source of heating in Hammarby Sjöstad, is
district heating. 34% of this heat comes from purified waste water, 47% from
combustible household waste and 16% from bio fuel. (Numbers refer to 2002.)
When the heat has been extracted from the warm, purified waste water, the
remaining cold water can be used for district cooling. This is used in e.g.
the cold storage in grocery stores, and also for office buildings as a
replacement for energy guzzling A/C-systems.
New technology and interesting development projects
Different solutions for supplying energy is tried out in Hammarby
Sjöstad. For example, two buildings with solar cells can be found on Sickla
Kanalgata. The solar cells contribute by supplying electricity for the
public areas in the building.
One large residential building has been fitted with solar panels. These help
supply the residents with 50% of the hot tap water they annually use.
Another interesting development project is the fuel cell which has been
placed in GlashusEtt - the area's Environmental Information Centre. The fuel
cell could be described as a battery which, instead of being charged, runs
off of fuel (e.g. hydrogen gas). The fuel cell generates electricity and
heat.
Approximately 900 flats in
Hammarby Sjöstad has biogas cookers. The biogas comes from the residents
themselves. It is formed when sludge from the waste water treatment is
digested. Amazingly, the biogas "produced" by the average family is close to
equal to the amount of biogas they use for cooking. By replacing the
electricity for the cookers with biogas, the electricity consumption has
been lowered by 20% in the buildings in question.
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Environmental goals The goals relate to the sum of all the energy bought to heat the buildings and operate them each year. Household electricity is not included. District heating connection with exhaust air systems: 100, of which 20 kWh electricity/m² UFA District heating connection with heat extraction systems: 80, of which 25 kWh electricity/m² UFA The entire heating supply shall be based on waste energy or renewable energy sources. Electricity shall be “Good Environmental Choice”-labelled, or equivalent. |
