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District heating
is a safe and environmentally good way of heating houses and industries. In Göteborg district heating started in the Kortedala suburb the 24th of August, 1953. Today a 700 kilometre long pipe connects about 90 percent of
all apartment blocks in Göteborg and industries and
workplaces. For one-family homes only 4000 are connected but the goal is to
have 16000 by 2010.
- 2/3
of all district heating is produces from waste
water, industry and waste incineration.
- In
1970 90 percent of the heating was produced by oil. Today almost no oil is
used.
- The
emission of nitrogen dioxide has halved in 20 years even though the energy
used has doubled.
- During
the same period the emissions of sulphur and nitrogen oxide has been
reduced by 98 and 85 percent respectively.
The whole district heating
system contains 20 heating facilities of which 3 are large. Some small ones at
the end of the system are only used for supporting the system during winter. A
couple are only used in reserve. About 20% of the
energy supplied in Göteborg is renewable. It comes
from the waste incineration at Sävenäs, bio fuels and
from electricity from hydroelectric power and eleven wind turbines. The rest of
the district heating is produced by Göteborg Energi's
power and heating plant at Rosen Lund, and at the high-temperature water
stations. Natural gas, bio fuel and oil are used for this. In the summer the
district heating energy is used to cool the buildings.
Hot water from the refinery and hot water from the waste-water treatment
also contributes to district heating during the whole year. Waste heat from the refineries and the incineration
plant at Sävenäs accounts for almost three-quarters
of the district heating, together with heat from heat pumps at the Rya sewage treatment works. The use of waste heat entails reusing energy, which has made Göteborg’s use of energy more efficient and thereby reduced
the consumption of energy. The amount of energy supplied is about 10% less than
the energy used. We use in other words more energy than that which is supplied.
This is possible through the reuse of energy.
The total amounts of production of central heating
were 3900 GWh for 2002.
More
information: www.renova.se |