Organiser:WWF in Bulgaria
WWF first officially coordinated Earth Hour in Bulgaria in 2009. WWF has continued to run the Earth Hour event each year and In 2011 a record number of 47 Bulgarian towns and cities took part. Bulgarian tennis stars Tsvetana Pironkova and Grigor Dimitrov and actor Yulian Vergov were among the Earth Hour ambassadors in Bulgaria, together with the EU commissioner for International Cooperation, Humanitarian Aid and Crisis Response Kristalina Georgieva. Kalin Velyov and D2 band were among the musicians who played at free concerts in downtown Sofia.