Storing renewable energy

Often you hear that renewable energy is OK, but what happens when there is no sun for solar panels or no wind for wind farms?

These are fair comments. Of course, this energy could be stored in chemical batteries, but people are looking for other solutions. One of these might be using old mines for gravitational energy storage. Around the world there are millions of abandoned mines. 

As technology improves, I am sure solutions will be found.

Storing intermittent grid energy - NOT amateur radio

This is the "holy grail" of renewable energy. These days solar and wind energy are cost effective, but they are not always there when you need them. Crack storage and renewables will be the way to go. There just may be an answer. At the moment this is an MIT project.

Steve G1KQH may have to close his eyes!

See https://www.elektormagazine.com/news/molten-silicon-stores-excess-grid-energy?utm_source=Elektor+International+%28English%29&utm_campaign=afd6eb7863-EMAIL_CAMPAIGN_12_13_2018_11_34&utm_medium=email&utm_term=0_23bd160f48-afd6eb7863-234067237&mc_cid=afd6eb7863&mc_eid=b5d6dac1e2