Shares of Eos Energy Enterprises rose 18.75% to $3.61 after the company announced a collaboration with Google and MN8 Energy for the Mammoth Solar facility in Kanawha County, West Virginia. The project, being built on formerly mined coal land, will supply renewable electricity to Google’s regional data centers. Eos will provide its Z3 zinc-based long-duration storage system, while MN8 will own and manage the renewable facility. Commercial operations are targeted for 2028, with Eos battery installations scheduled for 2029 and 2030. The announcement followed EOSE’s reported 52-week low of $3.10 the previous day. Eos also reported an adjusted second-quarter loss of $1.20 per share, compared with analysts’ expected loss of 16 cents, while revenue climbed 351% year over year to $68.77 million. The company narrowed its 2026 revenue outlook to $300 million-$350 million from $300 million-$400 million after consolidating battery production in Warrendale, Pennsylvania. B. Riley cut its EOSE valuation target to $5 from $8 while keeping a Neutral rating.