In a space where most startups are still talking about reducing carbon footprints like it’s 2006, WattCarbon isn’t just talking, they’re measuring it, monetizing it, and putting it on-chain. While the rest of the industry argues over frameworks, McGee Young and Aaron Gubin built Aristotle, an AI-powered M&V platform that time-stamps and verifies carbon savings by the watt-hour and the gram. Real-time. Granular. Auditable. If your climate data isn’t this tight, it’s just storytelling.
And now they’ve got more fuel for the fire. WattCarbon just closed a Seed Extension round led by Cerulean Ventures, City Light Capital, and Tom O’Keefe. It’s undisclosed, but make no mistake, this isn’t bridge funding. It’s bridge-burning. They’re using it to double down on building the measurement infrastructure the clean energy economy desperately needs, while the rest of the market still relies on spreadsheets and good vibes.
Founded in 2021 and based in Lafayette, CA (with a San Francisco mailbox to keep things civil), WattCarbon has raised $7.23M across five rounds, including a $4.5M seed from True Ventures and a $1.5M pre-seed. Their investor lineup reads like a who’s-who of climate conviction, Village Global, Jetstream, Not Boring Capital, Greensoil PropTech Ventures, Rick Stratton, Chris Vargas, Keiki Capital, and more.
But the real wattage? That’s in the WEATS. The WattCarbon Energy Attribute Tracking System, launched in early 2024, is the first registry made for distributed energy resources. By May, they rolled out WEATS Marketplace, enabling hourly transactions of EACs from rooftop solar, demand response, and heat pumps. Peer-to-peer. Timestamped. Verifiable. Suddenly, clean energy doesn’t just save the planet, it moves like a market.
WattCarbon’s already pulled off the first-ever hourly EAC procurement, 500 MWh with Solar Holler in West Virginia, and they’re not stopping there. With key partnerships from Prologis, Rewiring America, Cloverly, Harvest Thermal, and Elephant Energy, this team is building more than infrastructure. They’re building trust in a market that desperately needs it.
Props to Stephen Suffian, Neil Williams, Dave Yeager, Heather MacDonald, Nathaniel Meierpolys, Juliana Press, Sarah Emery, and Kelli Littleton for pushing the stack forward. Climate tech isn’t about feel-good, it’s about feel-real. And WattCarbon is measuring what matters.
This isn’t the future of energy. It’s the infrastructure behind it.
