Hässelby CHP plant
In Sweden you can find Stockholm's first plant for combined heat and power production by the shoreline of Lake Mälaren. The plant started production in 1959 and in the beginning used oil and coal fuels, but since then three out of four boilers have been converted and today nearly 100% of the production is based on wood pellets and bio fuel.
Part of a northwestern district heating grid
Hässelby plant produces 826 GWh heat and 213 GWh electricity yearly. This equals the consumption of approx. 60,000 households.
Since 2004 the plant has been connected to the Brista plant in the Sigtuna municipality through the northwestern district heating grid. The grid has a length of 264 kilometre and a total volume of 34 000 m3. Thanks to the connection it is possible to adapt the production of heat and electricity to the most favourable fuel for the moment. The grid supports the municipalities of Sigtuna, Arlanda, Upplands Väsby, Hässelby, Vällingby, Järvafältet and Sollentuna with district heating.
The Hässelby plant has four boilers. The three boilers P1-P3, built in 1959, are connected to the district heating grid. They have an effect of 100 MW each and have a steam turbine each. The fourth boiler P4, built in 1969, is only for electricity production and is since 1999 put in long term conservation.