Iberian spot power up on weak winds, cold weather

* Spain day-ahead 35.29 euros ($51.97)/MWh, up 0.63

* Cal-10 up 0.15 to 40.65 euros/MWh

MADRID, Dec 11 (Reuters) - Iberian spot power prices rebounded on Friday from a prior fall, driven by a lack of cheap wind power and forecasts of cold weather in the coming days.

Spot prices usually drop on Friday due to a predictable fall in demand for power over the weekend ahead.

Demand for power is expected to rise in the next few days, however, because daytime temperatures in Madrid, the Peninsula's biggest city, are set to fall to 4 degrees celsius on Monday, from 13 on Friday.

Wind farms in Spain, which on average supply about 14 percent of the country's electricity, were virtually becalmed and generating 554 megawatts, or 1.6 percent of total demand for power.

Spain's grid is still short of 2,000 MW of nuclear power because the Almaraz I plant is refuelling and not due back until next week, and the Asco I reactor is offline for maintenance and not expected back until next week, at the earliest.

The remaining six nuclear plants were producing 5,262 MW, or 15.1 percent of the generating mix, according to data from the national grid operator REE (REE.MC). Benchmark forward contracts were mixed after crude meandered throughout the day.

Baseload calendar-year 2010 was reported settling at 40.65 euros/MWh in over-the-counter dealing, up 0.15 on the day. On the Omip exchange, however, which accounts for 30 percent of forwards volume, the "cal" eased 0.15 to 40.30 euros/MWh.

Spain's power stations were emitting a relatively high 10,651 tonnes per hour of carbon dioxide. (Reporting by Martin Roberts; Editing by Keiron Henderson)