Daily Highlights: Key Deals in the Venture Market
- Valar Atomics closed a $1 billion Series B round led by Sequoia Capital with a valuation of $6 billion, plus a $200 million credit line;
- Base Power raised $1 billion in a Series D round at a valuation of $13 billion, tripling its worth in just ten months;
- Nvidia invests approximately $5 billion in the Safe Superintelligence lab founded by Ilya Sutskever;
- HappyRobot entered the unicorn club following a $150 million Series C round at a valuation of $1.2 billion;
- Antora Energy secured $550 million in a Series C round for the development of thermal batteries for industrial use.
Valar Atomics: Nuclear Reactor as a Serial Product
The biggest deal of the week was the $1 billion Series B round for startup Valar Atomics, led by Sequoia Capital with a valuation of $6 billion. The three-year-old company, which develops small modular reactors using helium cooling, has tripled in valuation in just a few months: following a $450 million round in April 2026, it was valued at $2 billion. The syndicate included Valor Equity Partners, Point72, Atreides Management, Conviction, HOF Capital, and other funds, while Sequoia partner Sean Maguire has taken a seat on the board. Additionally, the company closed a $200 million credit line, with Erebor Bank acting as the administrative agent alongside J.P. Morgan, Crescent Cove, and Hercules Capital.
The catalyst for this round was a technological breakthrough: the Ward 250 reactor became the first in U.S. history built by a startup to directly power an Nvidia Blackwell computing cluster. Now, Valar Atomics aims to transition from demonstrations to mass production of reactors following a factory model—with its own nuclear fuel line and a vertically integrated supply chain. For venture funds, it represents a bet on resolving the primary bottleneck in the AI economy: the queues for connection to U.S. power grids have exceeded 2,600 gigawatts, with waiting times reaching four to five years.
Base Power: $13 Billion for Distributed Energy
The second major energy round was closed by Austin-based Base Power, securing $1 billion in a Series D round with a post-investment valuation of $13 billion. The round was led by Ribbit, Addition, Valor Equity Partners, and the strategic investment arm of JPMorgan Chase; participation came from Altimeter, Coatue, D1 Capital, Sands Capital, and Energy Impact Partners, while Thrive Capital, Andreessen Horowitz, Lightspeed, and CapitalG reinvested. In total, the company has raised over $2.5 billion in less than three years.
The valuation trajectory is impressive even against the backdrop of AI rounds: $4 billion in October 2025 and $13 billion in August 2026. Alongside the round, Base Power introduced Base Core—a home battery with a capacity of 39.2 kWh, designed to support the energy grid. Investors are effectively financing the construction of a "distributed power plant" made up of thousands of home batteries—a model that adds capacity to the grid faster and cheaper than traditional generation methods.
Nvidia and Safe Superintelligence: Strategic Capital over Classic Venture
A landmark deal at the end of July that set the tone for August was Nvidia's investment of approximately $5 billion in Safe Superintelligence—a lab co-founded by OpenAI's Ilya Sutskever. This partnership will provide SSI with access to the Vera Rubin platform and allow it to increase computing power tenfold over the next twelve months. Notably, the lab has yet to release any commercial products—capital is entirely being raised for its research programme.
For the venture community, this deal illustrates a structural shift: chip manufacturers and cloud giants are becoming the largest capital providers in late-stage funding, displacing traditional funds from the most expensive financing rounds.
HappyRobot: A New Unicorn in Agent AI
San Francisco's HappyRobot raised $150 million in a Series C round led by Prysm Capital and Eurazeo, achieving a valuation of $1.2 billion. Existing investors include a16z, Base10, and...
