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AS Tallinna Vesi signed a contract for the construction of a combined heat and power plant on the Wastewater Treatment Plant in Paljassaare

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AS Tallinna Vesi signed a contract with Filter Solutions OÜ on 30.12.2022 for
the construction of a combined heat and power plant (CHP) on the Wastewater
Treatment Plant at Paljassaare, which will help to reduce the cost of heat and
electricity by using biogas generated in the wastewater treatment process.

The cost for the construction of the new CHP complex is approximately EUR 2.4
million and the plant is expected to be launched at the end of 2023. The
contract with the Solutions OÜ also includes maintenance during the warranty
period.

Biogas, which is generated in the Wastewater Treatment Plant during the
stabilisation of sewage sludge, can be used to produce electricity in addition
to the production of heat once the combined heat and power plant is launched.

"This is a very environment friendly way of producing energy that allows to add
value to biogas that we produce ourselves as a by-product," explained Aleksandr
Timofejev, Chief Executive Officer of Tallinn Vesi, adding that the investments
in a combined heat and power plant reduce the Company's cost of purchasing
electricity for operating the Wastewater Treatment Plant, improve the security
of the plant's electricity supply and enable better management of the purchase
of electricity. From the biogas generated from sewage sludge at the Wastewater
Treatment Plant in Paljassaare, electricity can be generated annually in an
amount that would cover the annual electricity needs of approximately 3,800
average households.

The combined heat and power plant consists of biogas purification and two
Jenbacher gas engines. The biogas consumption capacity of the complex is up to
4.6 MW. At this biogas consumption capacity, the electricity generation capacity
is 1.9 MW and the heat generation capacity is up to 2.1 MW. Both electricity and
heat are fully used for the own use of the Wastewater Treatment Plant at
Paljassaare.

The construction of the combined heat and power plant is part of a larger
project which also includes the reconstruction of digesters at the Wastewater
Treatment Plant in Paljassaare which will ensure that the energy potential of
sewage sludge is maximised. After the reconstruction of digesters, approximately
3.2 MWh of biogas can be produced from sewage sludge every hour.

The Wastewater Treatment Plant is equipped with a buffer reservoir where 20 MWh
of biogas can be stored to be used as an energy storage facility. Thus, the
buffer reservoir can be compared to an electric battery with the fastest charge
and discharge cycle of approximately 1 day. The buffer reservoir allows to
generate electricity as needed and according to the electricity prices.

This investment allows to reduce the total annual electricity consumption of the
Wastewater Treatment Plant and the pumping station by nearly 50%. Biogas
produced from sewage sludge covers up to 70% of today's average annual
consumption of electricity of the Wastewater Treatment Plant. Thus, the
Wastewater Treatment Plant at Paljassaare operated by Tallinna Vesi will, by a
wide margin, exceed the proposals to the Urban Wastewater Treatment Directive
published by the European Commission for renewable energy production volumes by
2030.

According to Timofejev, Tallinna Vesi has set the goal of reducing its
environmental impact by starting mapping the CO(2) footprint two years ago. In
order to reduce the footprint, 100% of electricity used at the Company's
facilities and in the treatment process is now generated from renewable sources.


Maria Tiidus
Head of Communications
Tallinna Vesi
Ph: 626 2271
Email: [email protected]