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Uncle Joe

(58,366 posts) Thu Jul 30, 2015, 12:30 PM Jul 2015

Renewables briefly covered 78 percent of German electricity

http://energytransition.de/2015/07/renewables-covered-78percent-of-german-electricity/

On July 25, Germany surpassed the old record of 74 percent renewable electricity. But perhaps the most interesting aspect is power trading between France and Germany on that day. Craig Morris explains.

At the end of July, the storm Zeljko passed over northern Europe, causing considerable wind damage and flooding in some areas. Here in southern Germany, however, it was a relatively sunny day. In the north, where it was windy, Germany has most of its wind turbines installed. In the south, it has most of its solar. The combination of sunny weather in the south with strong wind throughout the country is rare – and led to a new record.

(snip)

Though Germany was a net exporter of electricity at the time, the trading situation with France is illustrative. The chart below from French grid operator RTE shows that France was a tremendous net exporter of electricity on Saturday, July 25 – at a time of low power demand. During the early morning, Germany (orange bars on the left) imported a tremendous amount of electricity – not because it needed it, but because French nuclear plants do not like to ramp down any more than the German ones do, so they were selling power to the Germans cheaply. This situation once again disproves the common notion that Germany can “rely” on French nuclear when it needs power. In reality, trading takes place based on price, not dire need to prevent blackouts. The Germans import nuclear power when demand – and hence the spot market price – is low.

A look at the trading prices reveals in fact that the German prices were a bit higher that Saturday. Peak and base prices averaged around 1.5 cents per kilowatt-hour in the Phelix zone (Germany and Austria), whereas French prices were closer to two cents. At those prices, the French should have been importing from Germany – but there simply was no need, and any imports would have forced the country to ramp down its nuclear plants even further. It’s further proof of the fundamental incompatibility of inflexible nuclear power with fluctuating wind and solar.

There is more on the link.