The term ‘supported energy sources' originates from Act No 165/2012 on supported energy sources and amending certain laws. Supported energy sources are understood to include, without limitation, renewable energy sources (i.e. energy of biomass and biogas, solar energy, wind energy, hydro energy etc.), secondary energy sources, high-efficiency combined heat and power generation, biomethane and distributed electricity generation.

The main purpose of the above law is to promote the use of the above energy sources with a view to protecting climate and the environment and increasing the share of renewable energy sources in the consumption of primary energy sources to achieve the set targets.

Under the above law, the Energy Regulatory Office sets out the scope and level of support in its price decisions.