Useful information can be found at:

Ministry of Energy https://www.me.government.bg
Ministry of Regional Development and Public Works https://www.mrrb.bg/
Agency for Sustainable Energy Development https://seea.government.bg
ЕU Energy Poverty Advisory Hub https://energy-poverty.ec.europa.eu
Covenant of Mayors https://eu-mayors.ec.europa.eu
European Association for Renewable Energy https://www.eurosolar.org