In the midday period when around 70GW of power station capacity was required, up to 36GW of wind and solar delivered more than half of the requirement, noted the Institute of the Renewable Energy industry (IWR).
A net 6.7GW of output went for export that hour, helping to buoy up the wholesale peak price (known as Phelix peak) for that hour at EUR 28.57/MWh.
Under German law, renewables have priority feed-in to the electricity system. Without the export, fossil and nuclear power stations would have had to throttle back production or suffer lower, or potentially even negative prices — effectively paying consumers to use the electricity.
New electricity market rules are expected to be tackled by the government after the federal elections in September. A revision of the Renewable Energy Act is due at the beginning of 2015.