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Modernised Thermal Power Plant Supplies Half of Bonn

What do you get when you cross a waste treatment plant with a modernised gas-fired power plant? The people of Bonn know the answer: because the local municipal utilities have combined old and new facility parts and developed their power plant into a powerful combined gas and steam (COGAS) power plant, which can supply half of the city. Now they save 194,000 tonnes of CO2 each year.

Renovating under their own direction: The Stadtwerke Bonn municipal utilities have coupled their gas-fired power plant to a waste treatment plant, thus converting it into a combined gas and steam power plant, and have done so during ongoing operation. A huge coordination effort, in particular because the contracts for the components were awarded in lots. There was a private contract award procedure for each lot. The big challenge here: putting together the pieces that were supplied by 16 different producers.

SWB Energie und Wasser took the brave decision to carry out the challenging construction work during ongoing operation. There was a private contract award procedure for each construction phase, which the municipal utilities staff supervised. This commitment has paid off: The municipal utilities saved €40 million.

Engine for progress:

  • saving of 194,000 tonnes of CO2 per year
  • halving of the specific emissions for heat and electricity
  • awarding contracts in lots has saved €40 million
  • qualification of the employees in power plant upgrading and operation

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Photo: Stadtwerke Bonn

The local municipal utilities have combined old and new parts and developed their power plant into a powerful combined gas and steam power plant, which can supply half of the city. Now they save 194,000 tonnes of CO2 each year.



More power, fewer emissions

The powerful effort has paid off: The heat and power station has reached an efficiency level of 90 per cent due to the modernisation. Electricity generation has increased by 30 per cent. This way, the people of Bonn have managed to reduce the specific CO2 emissions for electricity by 55 per cent and by 48 per cent for heat. Since the renovation, the power plant produces about 575 million kilowatt hours of electricity and 520 million kilowatt hours of district heat per year – through combined heat and power generation.

The costs are covered even more quickly

From a financial perspective, it is the small-scale procurement procedure that has paid off the most: The municipal utilities were able to save €40 million due to the conversion by lot. So the conversion costs will have been amortised in as little as 20 years. For NRW, the energy state, this is an important signal. And for the employees, an additional qualification in power plant upgrading and operation: through active management of the retrofitting of all plant components, commissioning and testing and the transition to commercial operation.

Heizkraftwerk Nord

SWB



Photo: Martin Magunia, Stadtwerke Bonn

"By combining a high-efficiency gas and steam turbine process in heat and power co-generation with the heat from the adjacent waste treatment plant, we have created optimal conditions for efficient on-site power generation. Unused heat thus becomes additional energy. A clear advantage that we use to the benefit of our customers and our environment."

Peter Weckenbrock, Managing Director of Stadtwerke Bonn



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Partners:
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