Introduction

Wastewater (sewage) is a proven source of energy which can be used for heating and cooling buildings. This technology is being developed for the construction of a heat pump in the waste water treatment plant of Turku.

Objectives and target audience

The main objective is to produce clean energy from renewable sources, in this case treated waste water, to be used for district heating and cooling in the city of Turku.

Financial Resources and Partners involved

Please give an overview of the budget, and an outline of the funders.
Which organisations were involved in shaping and delivering the project.
Total Turku Energy`s investment was 12,5 million euros. The Ministry of work and business also invested in this project–

Process

Turku Energy made cost accounting of heat pump’s best position and this option was selected as the best one.

Results

Once the heat pump will be running it is expected that it will produce18 MW clean energy for district heating and 35 MW for district cooling.
The annual volume of the heat pump will cover:-

• approx 80 % of district cooling volumes in Turku;
• nearly 10 % of district heating volumes in Turku.

As a result:-
The total share of renewable energy sources in heat generation will increase from 22 % to 30 %
It will substitute mainly coal-based base load:-

• Use of coal will decrease by 21 000 tonnes annually;
• SO2 emissions will decrease by 110 tonnes per year;
• NO2 emissions will decrease by 110 tonnes per year;
• Particle emissions will decrease by 6 tonnes per year;
• CO2 emissions will decrease by 46 000 tonnes per year.

Critical Success Factors / Challenges