However, regardless of the state of nuclear in Europe, the big problem is that Germany does not produce enough energy, which spikes the energy prices in neighbouring countries.

That is only half true. Northern Germany has an energy production surplus and frequently exports energy to Belgium and the Netherlands. However Denmark has even cheaper energy production, which is why northern Germany is importing energy from there despite having an energy production surplus. The real issue lies with southern Germany, mainly Bavaria. The conservative Bavarian government has effectively strangled renewable energy production capacity with obstructive legislation over the past decade, which, coupled with their block on strengthening the energy grid, has led to southern Germany being a net importer of energy.