EUROPE POWER-Weak electricity demand weighs on spot prices

* Rise in solar and wind output keeps pressure on prices

* Forward curve gains on higher coal prices

PARIS, July 27 (Reuters) - European electricity prices for next-day delivery were lower on Wednesday on the back of a slight fall in consumption and a rise in power supply from wind, solar and nuclear sources.

Electricity demand is expected to fall by 260 megawatts (MW) in France and by 180 MW in Germany on Thursday, Thomson Reuters (Dusseldorf: TOC.DU - news) data shows.

On the supply side, solar power output in Germany will increase by 860 MW day on day to nearly 6 gigawatts (GW) on Thursday, while wind power availability in France will rise by 310 MW, the data showed.

Available nuclear power capacity in France is forecast to be up by 430 MW.

German baseload power for Thursday delivery fell 0.2 euros, or 0.6 percent, to 32.85 euros ($36.11) per megawatt-hour (MWh), while the equivalent French contract remained unchanged at 35 euros/MWh.

Along the forward power curve prices rose marginally on Wednesday, tracking coal and carbon, while oil fell.

Oil prices dropped close to three-month lows on Wednesday after U.S (Other OTC: UBGXF - news) . industry data showed weekly oil stocks declined by less than expected, feeding into concerns over persistent oversupply dragging down prices.

German baseload power for next year, the Cal '17 contract, was at 27.65 euros a megawatt-hour (MWh), up 0.25 euros. The equivalent French contract rose by the same amount to stand at 33.40 euros/MWh.

European coal prices for 2017 rose $0.45, or 0.75 percent, to $60.20 a tonne. Front-year EU carbon allowances rose 0.02 euros or 0.44 percent, to 4.54 euros a tonne.

European coal futures have posted gains in recent days, hitting a one-year high of $60.35 a tonne on July 18 amid higher demand and tight supply of thermal coal.

In eastern European power, the Czech year-ahead position rose by 0.45 euros, or 1.6 percent, to 28.40 euros. The day three position fell 0.7 percent to 34.25 euros/MWh. ($1 = 0.9107 euros) (Reporting by Bate Felix; Editing by David Goodman)