Use this Power Switch with latch circuit to only use nuclear or steam power when accumulators drop below 20% and stop at 40%.
Connect your nuclear or steam power to the top (hazard concrete), the rest of your electric grid to the bottom.
by Unknown Author · updated 9/9/2018 · 13

Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
Use this Power Switch with latch circuit to only use nuclear or steam power when accumulators drop below 20% and stop at 40%.
Connect your nuclear or steam power to the top (hazard concrete), the rest of your electric grid to the bottom.