In November 2008, Knyazhye Ozero received a green certificate from the European Economic Chamber of Trade, Commerce, and Industry. The settlement was certified in accordance with the European Quality Standard for Ecological Housing and was presented the status of ECO VILLAGE. Moreover, Knyazhye Ozero received the Quality Mark, given only to products and services that help use renewable energy efficiently to improve quality of life without damaging the environment. Such a mark is bestowed upon products that meet the general legal requirements and are up to the European Quality Standard for Ecological Housing.

Knyazhye Ozero was the first Russian settlement ever granted this certificate directly by the EEIG.