> Battery storage is a competitive, commodity business.

No isn't. There is really not that much Li-Ion grid storage being deployed right now and not by that many companies. That market is growing fast.

> Not sure how huge it will be.

The amount of needed grid storage is gigantic.

Edit: Elon just said on the call that they are massively limited on production. Partly because of the chip issue, same chips are used in the cars and the cars have higher margin. But cell supply is also limited. So the demand is growing but they can't increase production as fast.

Battery construction is incredibly intricate and has a huuuuge amount of process tech. There's already a huge moat around it because of the level of knowledge needed and a severe lack of talent. That moat will only grow as more and more in house tech is developed for production and for chemistries. There's a solid chance that all the players of one of our biggest new economic sectors this century are already producing.