A home-battery company that did not exist three years ago is now worth $13bn. Base Power has raised $1bn in a Series D and launched its own battery, Base Core. The bet behind the number is blunt: the grid cannot keep up with America’s power demand, and thousands of home batteries can.

The round values the Austin company at $13bn post-money and takes its total raised past $2.5bn, it said. It was led by Ribbit, Addition, Valor Equity Partners and JPMorganChase’s strategic investment arm. Existing backers including a16z, Thrive Capital, Lightspeed and CapitalG put in more.

Base Core is the product the money is meant to scale. Built at the company’s Austin factory, it is one of the largest home batteries on the market, rated at 39.2 or 78.4 kWh. Chief executive Zach Dell, son of Michael Dell, says it installs in under an hour and rides out extreme weather. It is on sale now in parts of Texas and Illinois.

The grid can’t build fast enough

The thesis rests on a shift we cover constantly from the other side. AI data centres and wider electrification are pushing power demand up faster than utilities can add supply. Building new generation is slow. Base’s answer is distributed: put a big battery in each home, then pool them into capacity the grid can lean on when demand peaks.

That makes each house a node in a virtual power plant, sold to the owner as cheaper power and backup. It is the mirror image of the data-centre squeeze. Base says its fleet now tops 500 MWh, it has moved from Texas into Illinois, and it has utility deals with El Paso Electric, Austin Energy and CoServ worth more than 200 MW.

A big number to grow into

The valuation is the eyebrow-raiser. A $13bn price for a 2023 startup with a roughly 500 MWh fleet is steep, and home batteries are a capital-heavy, install-by-install hardware business that has humbled bigger names. The virtual-power-plant model only pays off at national scale, and Core is live in slices of just two states.

What Base has is capital and conviction. The raise lands as Big Tech pours billions into data centres and long-shot bets like fusion to feed them. Base is arguing that the fastest new capacity is already sitting in people’s garages. The same AI boom that is straining the grid has turned fixing it into a venture-scale prize.

For now, the reality is smaller than the number. Core is available in regions of two states, from a factory making thousands of units a month. The $13bn is a bet that the garage becomes the power plant, and that Base gets there first.

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