I didn’t know that my heading wouldn’t show up. This link discusses research into turning large slabs of concrete such as foundations, roads, etc. into giant batteries. They expect to store the electricity generated at sunny times through the night and through cloudy days–not to mention storing momentary grid oversupply for later. \
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjosL71iqWEAxXnNEQIHQi2BrYQFnoECA0QAQ&url=https%3A%2F%2Fwww.science.org%2Fcontent%2Farticle%2Felectrified-cement-could-turn-houses-and-roads-nearly-limitless-batteries&usg=AOvVaw0SSBHPGGm8EgBQc4S2i3fQ&opi=89978449