Arch
Rao.

Walk into almost any American home built before 2020 and open the utility closet, the garage wall, the basement alcove - you will find a gray metal box full of switches that hasn't meaningfully changed since Eisenhower was president. Arch Rao looked at that box and saw the single biggest obstacle to decarbonizing the American home. Then he walked away from one of the most coveted jobs in clean energy to fix it.

This is not a Silicon Valley story about an app. Rao is building hardware - the physical infrastructure layer that sits between the utility grid and every device in your home. The kind of thing that has to work for twenty years in a garage in Phoenix in July.

Before founding SPAN in 2018, Rao spent five years at Tesla, running the product and application engineering team for Tesla Energy. His team was responsible for bringing Powerwall, Powerpack, and the SolarCity roof products to market - building the installer ecosystem, the product configurations, the sales engineering playbooks, and the global deployment programs that made residential and commercial energy storage real. When Tesla Energy was still figuring out how to wire a battery to a house at scale, Rao's team was in the field doing it.

What he kept running into was the panel. Every solar installation, every battery installation, every EV charger installation - they all eventually hit the same wall. The electrical panel was a 1950s device that couldn't tell you what was on, couldn't route power intelligently, couldn't communicate with anything. It was the dumbest link in an increasingly intelligent chain. In some California homes, adding a heat pump or an EV charger required a $3,000-to-$25,000 electrical service upgrade because the panel simply had no capacity headroom. The appliance was fine. The panel was the problem.

Rao had spent time in energy before Tesla, too - in ways that were decidedly not obvious paths to a hardware startup. He helped co-found Verdigris Technologies, which brought AI-powered energy analytics to commercial buildings. Before that, he was a founding engineer at Joby Energy, working on airborne wind turbines at a time when the idea sounded like science fiction. Before that, he was at Stanford, where he had started a PhD in energy before deciding that the real work was happening outside the lab.

The thread running through all of it is a discomfort with incremental solutions to large structural problems. Verdigris was about replacing paper energy audits with real-time data. Joby was about finding new places to harvest wind power. SPAN is about making the electrical panel - the device that controls every circuit in your home - intelligent enough to actually manage the coming wave of electric appliances.

The SPAN Panel looks different from what it replaces. It connects to your home's WiFi. It has a mobile app that shows you, in real time, which circuit is drawing how much power. You can turn circuits on and off remotely. When a wildfire utility shutoff hits and your batteries are the only power source, the panel can automatically shed the non-essential loads - the outdoor outlets, the guest room, the wine fridge - and extend your backup duration by 40%. For homeowners who installed solar and batteries hoping for energy independence, that is not a small thing.

For the utility companies, SPAN's grid-edge position is increasingly interesting for a different reason. A home with a SPAN panel is a home that can respond to demand-response signals from the grid in milliseconds - not hours. When grid load peaks on a hot afternoon, the utility can ask SPAN panels across a neighborhood to briefly reduce consumption. The homeowner doesn't notice. The grid operator gets headroom. This is what Rao means when he talks about homes becoming active grid assets rather than passive consumers.

SPAN's newest product, SPAN Edge, takes this further - it's an at-the-meter device aimed directly at utilities, letting them manage load at the grid edge without requiring full panel upgrades. It's the company's first explicit move toward the utility side of the market, and it suggests where things are headed: SPAN is positioning itself as the software and hardware layer through which utilities, homeowners, solar installers, EV charger companies, and battery manufacturers all communicate.

The investors backing this vision are an unusual coalition. Wellington Management, one of the world's largest institutional investors, led the Series B. Fifth Wall, the real estate tech fund, is in. Robert Downey Jr.'s FootPrint Coalition is in. Amazon's Alexa Fund is in. Van Jones' Obsidian Investment Partners is in. The range suggests that people are reading SPAN as something more than a hardware company - as an operating system layer for the electrified home.

SPAN has also been methodical about partnerships in a way that suggests Rao understands the installer ecosystem deeply - which makes sense given that his Tesla years were spent figuring out how to get energy hardware deployed at scale. The company's distribution partnership with CED Greentech, the country's largest solar equipment distributor, gets SPAN panels in front of every solar installer in America. The partnership with Kenmore - targeting one million home electrifications over a decade - is about reaching homeowners who are adding heat pumps, induction stoves, and dryers and discovering that their old panel is the limiting factor.

In 2024, Rao helped launch the Utilize Coalition alongside Tesla, Google, and Carrier. The coalition's stated goal: push grid utilization above 50%, its current ceiling. The idea is that a grid running at 50% capacity is expensive and wasteful; the SPAN-equipped homes, EVs, and batteries across America represent a distributed resource that can smooth grid load if the right communication protocols exist. This is a years-long project, and Rao is framing SPAN as the node that makes it real in residential settings.

He is not shy about the scale of the goal. Ten million homes by the end of the decade. That is not a hockey stick projection - it is a target that would require SPAN to become as standard a component of home construction and renovation as the panel it replaces. Rao has said that the electrical panel is like color television: it predates it. His pitch is that the panel is finally going to get its own color television moment, a half-century late.

The $163 million latest round, which closed in early 2026, was Venture (Round not Specified) - and it closed with the company still in its scaling phase, not yet at the ubiquity Rao is targeting. That means there is a lot of road ahead. But if the next decade does turn out to be the decade of home electrification - heat pumps, EV chargers, battery backups, solar integration - then the device that manages all of it becomes, quietly, one of the more consequential pieces of hardware in the American home. Rao left Stanford and Tesla and two previous startups to build exactly that.