Wind and solar, plus the already existing 6gw of pumped storage and increased curtailment gets you to 80 percent. The remaining 20 percent requires more storage

Wind and solar, plus the already existing 6gw of pumped storage and increased curtailment gets you to 80 percent. The remaining 20 percent requires more storage. Batteries can help to some extent for shifting day to day peaks. Seasonal storage is more tricky. Germany has about 3 months worth of natgas stored in underground caverns. One approach would be to use this to store syntheticly produced gases from electrolysis. Note so far everyone here is talking about electricity which only makes up a third of Germany's emissions. Synthetic gases (non-fossil) will be required for high temperature heat, and chemical feedstocks for industry. For example some steel smelters in Germany are transitioning from coal to hydrogen. Nuclear is a poor fit to an electrical grid which is mostly renewable for both economic and technical reasons. However it may be a good fit for running synthetic gas plants which can use both the heat and electricity and require 24/7 energy.