US AI-driven clean energy-focused software firm Stem Inc (<a href="https://www.nyse.com/quote/XNYS:STEM" target="_blank">NYSE:STEM</a>) and SoftBank (<a href="https://quote.jpx.co.jp/jpx/template/quote.cgi?F=tmp/e_stock_detail&MKTN=T&QCODE=9984" target="_blank">TYO:9984</a>)-backed solar and storage assets developer SB Energy have decided to combine their expertise under a multi-year technology and commercial partnership to deliver AI-enabled energy products.