The tenant-owner association Promenaden's roof in central Falun is now covered by both solar cells and solar panels.
In the basement is the energy center, or "piggy bank" as it is called by the board.
In 2002, work began on streamlining energy in the association, which consists of 75 apartments built in 1969.
- The goal was to halve our energy consumption.
We started by looking at solar panels and our entire system, says Jan Berg.
A dramatic change
Today, the association's electricity and heat come mainly from the solar cells and solar panels on the roofs.
The heat from the exhaust air and the wastewater is recovered.
Everything is connected to the "piggy bank", the energy center in the basement with heat pumps.
Ultimately, district heating is used.
The association has also changed windows and made a traditional trunk change that has significantly reduced water consumption.
- Another dramatic change took place when the members had to start paying for their electricity consumption themselves, which was previously included in the fee.
Then consumption decreased by 88,000 kilowatt hours per year, says Jan Berg.
He states that the association, thanks to energy efficiency improvements, has removed approximately SEK 1 million per year from the tax-linked costs.
The goal of halving energy consumption has already been passed.
- We have reduced the consumption of purchased energy from 222 kilowatt hours per square meter to just under 50 kilowatt hours, says Jan Berg.
"It's a lot of work of course"
But it also costs a lot to streamline.
The association itself has invested more than seven million kronor and received just over one million in energy grants, but expects to recoup the costs in the future.
- I would think that we will be ashore in eight, ten years.
Then it's free, says Jan Berg who is proud of the association's work.
- It is a lot of work, of course, but also cool to see that we are now almost self-sufficient.