Currently mostly coal (mostly lignite) with a little imported LNG for base load and peaks. Wind and solar if available. Rest is imported nuclear, coal and other power from neighboring countries.

Longer term, a switch to 100% renewables is planned, which is supposed to take 20 years. However, plans are coming along too slowly, especially regarding storage and transmission lines. But also necessary ramp-up of wind and solar installations is extremely lacking. Meanwhile power prices are at an all-time high and no betterment in sight. Meanwhile a switch to mostly-electric transportation, green steel smelting, green concrete production, and mostly electric heating should happen, which will roughly triple electricity consumption overall.

So I guess we'll wait and see, most probably more of the imported whatever-we-can-get at stellar prices.