Finally, contracts were in force at the end of the year for the development, implementation and support of the accreditation process for Environmental Management Sys tems according to ISO Arachthos (Thermal Power Plants of Pournari I and Pournari II, and of Aoos), Aliakmonas (Thermal Power Plants of Polyfyton, Sfikia, Asomata and Hydroelectric Power Plant of Agras and Edessaios) and Acheloos (Hydroelectric Power Plants of Kremastra and Stratos I and II).