Heard lots of grumbling from an acquaintance in Germany that a big issue is, I quote, "Bavarians not wanting either overground nor underground power lines that would bring power from north to south, so at best we sell wind power from north to west and the south of germany buys nuclear from france" ;)
It's a huge issue, see the depressing web page on Südlink. Massively delayed, much more expensive, and less efficient because it has to be underground. https://de.wikipedia.org/wiki/Suedlink
Germany, like the UK, has dynamic national electricity pricing, which makes no sense when the interconnections are not powerful enough to actually make it a single electricity market.
It's not a real free market, though, if you ignore transmission. Since transmission is a scarce resource it needs to be part of the market to send the signal to build more of it (or more battery storage, or better located production). The national auctions obscure the actual resource shortage and therefore the market can't work.
