Stockholm biofuel CHP set for debut as final tests being completed

A biofuel combined heat and power (CHP) Plant, dubbed KVV8, located in downtown Stockholm, Sweden is in the process of completing its final testing phase three years after initial construction.

The Värteverken cogeneration plant is being developed by Fortum Värtan, a 50:50 joint venture between Fortum and the City of Stockholm. It is part of Fortum's Roadmap 2020, which is aimed at producing heat and electricity in Stockholm using 100% renewable resources by 2030.
Värteverken cogeneration plant
With an installed capacity of 280 MW heat and 130 MW electricity, it is touted to be the biggest facility of its kind in Sweden. The annual output capacity from the facility is rated at 750GWh electricity and 1,700GWh heat.

The electricity produced from the facility will be conveyed to the existing Stockholm Southern-central district heating network, whereas the electricity will be conveyed to the public grid.

The heat produced from the biofuel CHP facility will be capable of heating approximately 190,000 average size apartments and the facility is expected to offset 126,000t of carbon dioxide emissions a year.

The main process building is equipped with a PowerFluid fluidised bed boiler, a flue gas cleaning plant, a steam turbine, a generator, turbo-set control system, regeneration system, heaters for hot water heating, and electrical and control systems.

Other ancillary facilities include a feedstock sift and crushing building, a 50,000m³ underground fuel storage facility, underground tunnels integrating a transportation belt to convey the feedstock to the process plant, an ash silo, and biofuel storage facilities.

The project also involved the construction of a 200m-long fuel loading pier and upgrade of infrastructure at Värtan Energy Port, with the inclusion of fuel storage and handling facilities.

The CHP plant will utilise feedstock including chips, bark, branches, tops and twigs sourced from Scandinavia, the Baltic countries and Russia. It has a feedstock processing capacity of approximately 12,000m³ a day and therefore requires delivery using three to four ships and five trains a week.

The feedstock transportation by trains will be handled by Hector Rail, as part of a five-year agreement, whereas the transportation of the feedstock by ships will be performed by ASPO Group's ESL Shipping.

The overall investment in the project is estimated to reach $517m. The European Investment Bank (EIB) is providing a €260m (4287m approximately) loan, whereas the Nordic Investment Bank (NIB) is providing a €155m ($177m approximately) loan.

The steam turbine, generator, turbo-set control system, regeneration system and heaters were supplied and installed by Doosan Škoda Power, who is also responsible for the commissioning. It further subcontracted ORAB Construction to assemble the turbine's pipe components.

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