Czech Prime Minister Mirek Topolanek, whose country chairs the European Union until June 30, called for a nuclear power revival in the wake of a gas crisis that left thousands of Eastern Europeans without heat in the midst of winter, DPA reported. "Do we want sustainable energy supply with low (CO2) emissions? Then we cannot do without nuclear," Topolanek told an energy security conference in north-eastern Czech Republic. While backing atomic power, Topolanek warned against reliance on "imported" sources of energy. Experts say that the continent's growing gas needs have been chiefly fuelled by emergence of gas-fired power plants. Energy Commissioner Andris Piebalgs reiterated EU's neutral stance to nuclear power, which leaves its use up to the EU's 27 member states.