US-based SMT Energy has sold a portfolio of battery energy storage projects (BESS) with a combined capacity of about 400 MW in Texas to the asset management arm of Swiss bank UBS Group AG (<a href="https://www.six-group.com/en/products-services/the-swiss-stock-exchange/market-data/shares/share-explorer/share-details.CH0244767585CHF4.html#/" target="_blank">SWX:UBSG</a>).