New energy facilities in Stavanger save 372 tons of CO2 emissions per year

Stavanger municipality has installed a new renewable energy plant for three municipal office buildings. The energy central heats and cools the buildings using energy from the city’s waste water, reducing the CO2 emission by 85 %.

In Norway, there are great natural renewable resources in hydropower. In the Triangulum project, however, Stavanger thrives to find solutions that can be replicated in most cities around the world.


The new energy facility harvests energy from every toilet flush and all the water that goes down the drain, rain water, water from dishwashers and washing machines. The water flows in a gigantic tunnel underground. For this demonstration, the municipality uses 100 meters of the tunnel where 108 drain heat exchangers are placed, absorbing heat from the waste water that flows in the tunnel.

With this solution, Stavanger has created a renewable energy source that can be replicated all over Europe. The new concept is calculated to meet the target of usage of 75% renewable energy sources, achieve the best possible performance on reduction of CO2 emissions, and provide the best value for money.

The new energy facilities answer to the obligations the city of Stavanger has committed to regarding the Paris agreement, the Covenant of Mayors and national and local climate and environmental requirements.

Watch the video about the project: https://www.youtube.com/watch?v=Gj3ADgagkZk