The transmission capacity is only too small because the nuclear power plants were closed. The Swedish distribution network was designed for hydropower in the north, nuclear power in the south. The hydro plants in the north would feed heavy industry, the nuclear plants in the south would feed the needs of most of the population and industry there with the rest being filled in by the overcapacity from those hydro plants in the north.

Then the nuclear power plants were closed while simultaneously allowing the establishment of several data centres by the likes of Google in the south. Those data centres - which easily saturate the local transmission capacity which has already caused other industry to look elsewhere for expansion due to the lack of electricity - do not pay regular electricity rates, they pay far less than either other industries let alone regular consumers.

Who closed those nuclear power plants? Who called for the establishment of those data centres, knowing what problems this would cause? Who did not upgrade the transmission capacity in the full knowledge of its limits?

So, this is not a natural market, it has been manipulated with disastrous results for the majority of the Swedish population - most of whom live in the regions SE3 and SE4 where electricity prices have risen dramatically in the last years.

As to you defence of the use of those fossil fuel power plants due to the (intentional) failure of the policies of the "green" party I can only shake my head in disbelief. What does it take to get those who claim to support "green" policies to admit they were wrong on the issue of nuclear power? More than the environment and the economy can bear it seems.

Also... drop it with that senseless "right" moniker already. It is a tired old trope and as far from the truth as can be. Looking at Sweden the supposed "right-wing" party Sverigedemokraterna is a centrist party (their program is strongly reminiscent of that of the social democrats in the '60s) and the "right-wing" Moderaterna is in reality centre-right (they, like all other Swedish 'mainstream' parties support the welfare state to a large extent). Sverigedemokraterna actually has an "energy expert" on an electable position for the coming elections - Elsa Widding - who wrote a report [1] on the subject of the Swedish grid, if you read Swedish (or feed it to a translator) it gives some insight in what they have in mind if they were to gain power. Their short-term focus lies on the preservation of existing hydropower (which "the left" wants to wind down to a significant extent, up to 1.5 TWh is to be closed down), an increased focus on achieving 100% fossil-free power (to avoid the situation I described where the oil-fired top load power plant is running in the heart of summer) to be achieved by e.g. restarting some of the nuclear power plants which "the left" closed down, focusing on combined heat-power (which "the left" is in the process of regulating out of existence) and getting rid of those sweetheart deals I mentioned where Google/Facebook/Microsoft (et al) get power nearly for free due to contracts signed by "the left". Their longer-term focus lies on increasing the amount of nuclear power in the mix, focusing on 100% fossil-free instead of 100% "renewable" and re-focusing on "climate" effects of power generation instead of "nuclear-free" power generation.

[edit] I just noticed a new article being published in Dagens Nyheter on the subject of the establishment of new nuclear power plants in Sweden. The conclusion is that this is fully possible but requires the removal of barriers put in place by "the left". The most important changes are the removal of the decision to close all nuclear power plants by 2040, the restriction that nuclear power plants can only be established there where there already is a nuclear power plant and a change which makes it possible to establish small modular reactors [2].

[1] https://via.tt.se/data/attachments/00738/d68a3b7a-ffe4-4cf1-...

[2] https://www.dn.se/ekonomi/karnkraftsbolaget-nya-reaktorer-mo...