SOFIA WWTP: GOLD STANDARD VOLUNTARY EMISSIONS REDUCTIONS

Methane capture and co-generation at WWTP Kubratovo.

The challenge

The wastewater treatment plant of Sofia used to be a large consumer of electricity with annual intake of 18 500 – 24 000 MWh.

After the successful implementation of a co-generation system, the plant has gradually increased its energy self-sufficiency to reach a status of net exporter of electricity in 2015. In 2023 the WWTP of Sofiyska voda, part of Veolia managed to produce more than 12% of excess green electricity on top of its own consumption.

After the Kyoto protocol mechanism, Sofiyska voda, part of Veolia looked for other options to monetise emission reduction from the co-generation project and to boost its image as an environmental company.

Veolia’s solution

Sofiyska voda, part of Veolia decided to explorer the potential of voluntary emission reductions market.
In 2014 the company embarked on a journey to certify the emission reduction reached as a result of the project through Gold Standard - the most stringent mechanism for voluntary emission reduction.

After a lengthy procedure for registration, the entity is able to certify emissions reductions for up to 21 years with an annual volume of > 70 KtCO2e.