Branch Energy Raises $33M Series B for Grid-in-a-Box Batteries
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Branch Energy has raised $33 million in Series B funding to scale its behind-the-meter energy storage system. Piva Capital and Clean Energy Ventures co-led, with Active Impact Investments, Whitecap Venture Partners, Prelude Ventures, Zero Infinity Partners, and Inovia Capital participating.
The Houston, Texas company is going after the interconnection bottleneck squeezing commercial electricity consumers and AI data centers. Generation projects in the US face median queue delays of more than five years to connect to the main grid, pushing data centers and industrial power users to look for faster routes to capacity.
Its core product is Arc, a containerized grid-in-a-box system sized to fit in a single standard parking space. The self-contained unit packs industrial-grade battery storage, grid-interconnection hardware, thermal cooling, and cloud-based autonomous controls. It arrives by flatbed truck and can be fully installed on-site within two days.
The business model differs from conventional storage vendors that sell hardware to building owners. Branch runs a fully managed service, covering upfront capital costs, permitting, installation, insurance, and ongoing maintenance.
In Texas, its launch market, the company also acts as the host site’s retail electricity provider, using the battery to optimize charging and discharging against peak and off-peak market rates. Building owners get guaranteed bill reductions plus emergency backup power during outages.
Branch monetizes the fleet as a virtual power plant, dispatching stored energy into wholesale markets during peak demand or contracting capacity directly to large off-takers, including hyperscale data center operators. Alex Ince-Cushman is co-founder and CEO.
Next comes Illinois, inside PJM Interconnection territory, where the operator recently updated pathways allowing large energy users to speed up interconnection by deploying their own on-site distributed capacity. Branch estimates roughly 1.2 million commercial buildings sit across PJM’s service footprint.
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