I found that one in the meantime, too. The interesting thing is that for the February event, they do say that some South German reserve gas-fired plants couldn't be relied upon due to a gas supply problem (page 52), so they could have said something about plants in Germany for the December event. Also, the map on page 49 showing the overloaded sections of the grid don't indicate problems hindering the use of the idling plants mentioned by IWR.

An additional interesting tidbit was that the Federal Grid Agency called for the regulation of exports, to avoid the selling of more power than available.

_{*Lunatic*, n.
One whose delusions are out of fashion.}