Here's why the U.S. electric grid isn't running on 100% renewable energy yet

I have two friends who are electrical engineers. According to them the biggest problem with renewable energy is scaling production to demand. “Renewable” energy is variable and unpredictable and lacks scalability to meet demand. Not mentioned in the article is the cost of mining rare earth metals, both from a monetary and ecological stand point it is very costly and involves exploiting third world countries. The fact that China controls 60% of rare earth minerals is another problem! I can’t imagine the battery system required o cover weeks of heavy snow in the Northeast with heightened energy demand! I place the article in the BS file.