Comment by rob74

What you call "aid from abroad" is generally called a functioning wide area synchronous grid (https://en.wikipedia.org/wiki/Wide_area_synchronous_grid) which covers most of the EU plus some Balkan states, Moldova, Ukraine, Turkey and the northwestern corner of Africa. So Germany can sell power to others when renewables are generating more than it needs (which is often), and import power, not necessarily because it couldn't produce it, but because importing it can be cheaper than e.g. starting up an additional backup plant. This is nothing special and has been working reliably for decades.