FRANKFURT, Aug 8 (Reuters) - Europe's power curve on Monday afternoon was mixed after some quarterly contracts for 2023 had set record highs on a mix of Russian gas and French nuclear concerns combined with bullish short-term weather factors.

German baseload supply for second-quarter 2023 was up 1.9% at 367 euros ($374.49) a megawatt hour (MWh) at 1445 GMT, below an earlier record of 375 euros, while third-quarter 2023 was still at its highest ever at 374.1 euros, up 3.3% .

French second-quarter 2023 and third-quarter 2023 positions were at all-time highs of respectively 349.5 euros, up 7.5% , and 338 euros, up 7.3%.

But annual French delivery for 2023 remained untraded and the equivalent German contract, Cal '23 baseload, lost 0.7% to 407 euros, having hit 415 euros earlier.

Russian gas exports via the Nord Stream 1 pipeline into Germany, and those through Ukrainian pipelines were steady on Monday while the overall prospect of scarcity this winter remains in place after Russia curtailed shipments.

France's regulator extended temporary waivers allowing five power stations to continue discharging hot water into rivers as the country contends with a fourth heatwave of the summer.

Hot and dry weather has also curbed river levels, hampering the transport of coal to power plants as barges cannot sail fully-laden.

The French Gravelines 2 and 5 reactors will end their current outages four and 7 days later respectively, on Aug. 18 and 21, EDF reported.

Spot power prices were below those at the end of last week on forecasts for more German wind power supply.

German Tuesday baseload traded at 356 euros, 7.6% below the price of Monday delivery. French day-ahead baseload, at 361 euros, was down 7.9%.

Germany will likely produce 6.4 gigawatts (GW) of wind power on Tuesday, 2.4 GW more than on Monday, Refinitiv Eikon data showed.

Power usage in Germany is set to rise by 1.4 gigawatts (GW) to 54.8 GW on Tuesday and in France will edge up by 200 MW to 43 GW.

($1 = 0.9800 euros) (Reporting by Vera Eckert and Forrest Crellin, editing by David Evans)