Coal-reliant Poland aims to increase support for biogas and solar generation through the end of the decade while cutting support for investment in wind and other renewable generation, a government official said on Tuesday.

Deputy Economy Minister Mieczyslaw Kasprzak said a new draft bill calls for Poland to increase the share of renewables in Poland's energy mix to 15.5 percent by 2020, up from less than 10 percent in 2010.

"Our goal is to simplify, optimize and improve the support mechanism for renewables," Kasprzak told Reuters in a recent interview.