The German Cal'20 year-ahead baseload contract, the European benchmark, fell 1.8 percent to 46 euros ($51.76) (MWh).
The equivalent French year-ahead contract dipped 1.2 percent to 49.20 euros/MWh, its lowest level since November.
European December 2019-expiry CO2 emissions rights dropped 3.1 percent to 21.70 euros a tonne.
Hard coal for northern European delivery in 2020 was down 0.32 percent at $77 a tonne. The contract touched its lowest level since April on Tuesday.
In the day-ahead market, prices dipped on increased wind output and lower demand in Germany, a trader said.
Germany's over-the-counter baseload contract for Wednesday delivery was down 0.3 percent at 46.35 euros/MWh.
The French next-day spot delivery price fell 4.25 euros to 50.75 euros/MWh.
German power demand will fall by 530 megawatts (MW) to 72.5 gigawatts (GW), according to Refinitiv Eikon data. The average temperature in Germany will rise by 1.3 degrees Celsius.
Electricity generation from German wind turbines will remain stable at 16.8 GW on Wednesday, the data showed.
French electricity demand is expected to increase by 640 MW on Wednesday to 73.3 GW, as average temperature rises by 0.8 degrees Celsius.
French wind power supply will rise by nearly 1 GW on Wednesday to 1.7 GW, while nuclear power availability is stable at 89 percent of installed capacity.
In Eastern Europe, Czech Monday baseload power - which mirrors the German contract - fell 3.8 percent to 46.40 euros/MWh. Year-ahead power was down 1 percent at 48 euros/MWh.