Emissions to air

District heating production causes emissions to air. Water, carbon dioxide, nitrogen oxide and sulphur dioxide are all formed in the combustion process. In recent years, researchers have concluded that gradual warming of the global climate (the greenhouse effect) is due to human activity releasing too much CO2 into the atmosphere. The largest emission sources are coal- and oil-fired plants and motor cars.

Countering the greenhouse effect
At Söderenergi, we switched from burning coal to burning mostly biofuels and recovered waste fuels back in the 1990s. This, together with our sophisticated flue gas treatment technology, has enabled us to reduce carbon concentrations by 80 per cent. The same applies to sulphur. Nowadays, these substances are derived not from heating but primarily from car use, leading to eutrophicaton and acidification. During this period, nitrogen oxide levels have been roughly halved.

The new CPH plant at Igelsta, which came on stream in December 2009, is enabling us to reduce our carbon emissions by a further 75 000 tons per year.

Major improvement in local air quality
For the air in Södertälje, construction of the Igelsta plant has meant the most significant environmental improvement for 20 years. We continue to strive for further reductions in our emissions.