London startup tem has raised $75 million to scale technology it claims can collapse decades of utility market inefficiency into a single software layer
There's a reason energy bills remain stubbornly opaque, even as other industries have been digitized into near-transparency. The electricity market, particularly in places like the UK, runs through a thicket of intermediaries—brokers, wholesalers, suppliers—each taking their cut before power reaches a business or household.
tem, a London-based startup founded by four former executives from energy tech firm Limejump, thinks it can cut through that. And after closing a $75 million Series B round led by Lightspeed Venture Partners, the company now has the capital to test whether its vision—an AI-driven transaction engine that matches buyers directly with renewable generators—can work beyond Britain's shores.
The oversubscribed funding round, which values tem at roughly $300 million, drew participation from Hitachi Ventures, Voyager Ventures, Schroders Capital, Allianz, and existing investors including Atomico, AlbionVC, and Revent. Total funding now stands at approximately $94 million. Lightspeed partner Paul Murphy will join the board.
For context: that's a substantial bet on infrastructure software in a sector known more for regulatory slog than breakneck growth.
Two Products, One Thesis
tem operates what CEO Joe McDonald calls the "Stripe of energy"—a comparison that might sound like startup hyperbole, except the parallel isn't entirely misplaced. Just as Stripe abstracted away payment processing complexity for developers, tem aims to replace the multi-layered intermediary system dominating electricity markets with what it describes as AI-native transaction rails.
The company runs a dual model. At its core is Rosso, the AI transaction engine that automates the intricate dance of matching corporate energy buyers with renewable power generators. Built atop that sits RED, a customer-facing "neo-utility" that directly supplies electricity to UK businesses. RED functions both as proof-of-concept and revenue engine, showcasing Rosso's pricing advantages while generating immediate cash flow.
McDonald and his co-founders—Jason Stocks, Ross Mackay, and Bartłomiej Szostek, all veterans of the UK energy tech scene—launched tem in 2021 with a blunt thesis: traditional utilities extract about $1 trillion annually through intermediaries that, in their view, add minimal value. tem's AI agents compress those layers. The RED service, for instance, reportedly runs on just two AI agents supported by a lean human team.
Whether that efficiency claim holds under regulatory scrutiny and scale remains an open question.
Early Traction, With Caveats
The numbers suggest at least some market validation. tem now serves more than 3,000 businesses across the UK, including names like Boohoo Group, Fever-Tree, Silverstone Circuit, and Newcastle United FC. The company says it processed over 2 terawatt-hours of energy transactions in 2025—roughly equivalent to Liverpool's annual electricity consumption—translating to an annualized gross transaction value around $300 million.
According to figures cited by The Times, tem's 2,600 clients have saved approximately $35 million since RED launched in late 2024. The platform claims to cut energy costs by up to 30% by eliminating wholesale markups and enabling many-to-many matching between businesses and multiple generators. Some schools, tem says, have trimmed annual bills by as much as £55,000.
Impressive, if not yet independently verified at scale. The company operates in the UK through a white-label partnership with Versa Energy, a licensed electricity and gas supplier—a pragmatic workaround that spares tem the regulatory burden of becoming a full-fledged utility itself.
The Licensing Gambit
While RED generates revenue today, tem's longer-term ambitions revolve around licensing Rosso to third-party utilities. Two unnamed utilities are already using the platform, according to the company, though details remain scarce.
This is where the strategy gets interesting—and riskier. Convincing incumbent utilities to adopt software that explicitly threatens their margin structures requires either desperation (rising operational costs, regulatory pressure) or vision (a belief that transaction volume will offset shrinking per-unit margins). It's unclear which dynamic tem is banking on, or whether utilities will bite at all.
McDonald frames the pitch in almost combative terms: legacy infrastructure is a value-extraction machine ripe for disruption. Maybe so. But utilities are also notoriously conservative, tethered to regulatory frameworks that don't move at startup speed.
Texas and the AI Power Crunch
The fresh capital will fund international expansion, with Texas—one of the U.S.'s most deregulated electricity markets—serving as the American beachhead. Australia is also on the roadmap. The company plans to continue scaling Rosso's rollout and licensing efforts globally, though timelines remain vague.
The timing isn't random. Power demand projections are surging, driven largely by data centers and AI infrastructure. The International Energy Agency expects global data center electricity consumption to double to approximately 945 terawatt-hours by 2030. Goldman Sachs forecasts data center power demand in the U.S. alone could jump 165% over the same period, with data centers accounting for nearly half of all power demand growth through 2030.
That creates both opportunity and complexity. As electricity markets juggle renewable intermittency, grid bottlenecks, and exploding demand, the matching problem grows exponentially harder. tem's pitch is that traditional utilities, built for a simpler era, struggle with this complexity—while its software thrives on it.
Perhaps. But navigating deregulated markets is one thing; cracking jurisdictions with entrenched monopolies and glacial regulatory processes is another.
The Infrastructure Gamble
What makes tem's story compelling is also what makes it precarious. Energy infrastructure plays are capital-intensive, regulation-heavy, and notoriously slow to scale. Software promises to change that equation, but only if the software actually works across jurisdictions, regulatory regimes, and grid configurations.
tem has proven it can operate in the UK, a relatively friendly environment for energy innovation. Whether that model translates to Texas, much less Australia or continental Europe, is the $300 million question.
For now, investors seem willing to bet that the middleman economy in energy is vulnerable—and that AI agents can do the job cheaper, faster, and with less friction than the layers of brokers and wholesalers currently pocketing fees.
McDonald and his team have a head start, a proven product, and fresh capital. What they don't yet have is proof that "the Stripe of energy" can scale beyond a single market. That's the test ahead.
