UTILITAS plans to use both seawater and wastewater to heat Tallinn | Economie

Robert Kit, Utilitas Eesti board member, told ERR that the concept of how to achieve carbon neutrality by 2030 was actually formulated by the company last summer. The events of the past few months have added a new dimension to this concept.

“If green energy and energy security have hitherto been spoken of as mutually exclusive phenomena, and concepts such as green energy and affordability are incompatible, then the simple economic truth today is that domestic renewable energy is not only the most reliable, but also the most economical source of energy.” ‘ said Kate.

He emphasized that it was no longer possible to rely solely on imports of fossil fuels as before.

“Tallinn is a coastal city,” Kate explained. “The sea is known to have constant energy throughout the year. Our plans are to start using this energy to heat and cool the city.”

According to him, the function of central cooling is in demand in office buildings, shopping centers and apartment buildings.

“Using seawater energy to heat and cool places is a common practice. Both Helsinki and Stockholm use this energy source,” he added.

In Sweden, wastewater is used extensively to generate heat.

“Pure water has a constant temperature all year round,” Kate said. “It contains usable energy.”

This does not mean that it is planned to send sewage through central heating pipes, but it will give up part of the heat, and cooler sewage will enter the sea.

“The core of the project in general is to replace fossil fuels as raw materials for heat production with seawater and wastewater,” Kit said.

It is assumed that the main source of heat for Tallinn residents will continue to be household waste and wood chips burned at the Iru, Väo and Mustamäe thermal power plants. Two-thirds of the heat in the capital’s homes comes from these three stations. In addition, natural gas has been used so far during peak periods due to severe frosts, and instead it is planned to use heat pumps.

“Maybe they will only be connected occasionally. But in these moments they will cover most of the peak of pregnancy,” Kate concluded.

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