Energy storage is normally a smaller but growing business for larger companies. We recommend TSLA for a large cap US name with exposure to the theme and PSI for a small cap Canadian name. Energy storage is only a small part of these businesses however. There is a very tiny ETF called IBAT which has an energy storage focus, but it only has $6M in assets so we do not recommend this option now, but it could have potential in the future.
Authors of this answer, directors, partners and/or officers of 5i Research and/or affiliated companies have a financial or other interest in TSLA.