GM Ventures Leads $108M Series B Into Peak Energy's Sodium-Ion Push

Peak Energy has closed a $108 million Series B round led by GM Ventures, money the California startup will put toward scaling domestic manufacturing of its passively cooled sodium-ion grid-scale storage systems and breaking into the data center power market.

The raise matters for the storage supply chain on two fronts. It funds a 4 GWh factory in Sacramento, California, expected to begin production in Q1 2027, and it backs fulfillment of more than $1 billion in existing customer orders — a backlog that now anchors the company's commercial position.

Additional investors in the round included Maverick Silicon, Infinite Capital, Eclipse, Xora Innovation and LG Technology Ventures.

Why sodium-ion, and why now?

Founded in 2023, Peak Energy develops passively cooled sodium-ion battery storage systems. The chemistry argument is straightforward: sodium-ion cells rely on abundant, domestically sourced materials rather than constrained lithium supply chains, and the company's system-level design pushes the cost case further.

According to the company, its architecture eliminates conventional cooling systems entirely, cuts energy waste and requires no planned maintenance. The claimed result is energy costs up to 20% lower than conventional storage systems, alongside longer operating life and lower lifetime ownership costs. For data center operators weighing power density against operating expense, a 20% cost reduction is the kind of number that moves procurement conversations.

The design also addresses the safety file. Peak says the system runs with minimal noise, requires no water and is engineered to reduce battery fire risks — three operational constraints that data center developers increasingly treat as gating issues, not preferences.

Kevin McCabe, President of GM Ventures, said: "GM Ventures is investing to help Peak Energy continue to scale this innovative technology because we believe it has significant potential in the energy storage market as a safe, cost-effective solution using abundant, domestically sourced materials."

What does the GM relationship deliver?

The Series B deepens a relationship that was already underway. In June, Peak Energy and General Motors announced a partnership to jointly develop next-generation sodium-ion battery cells for the grid-scale energy storage market, drawing on GM's U.S.-based battery cell industrialization expertise.

That matters because cell industrialization — not lab performance — is where most storage startups stall. GM brings manufacturing know-how from its own battery build-out, and the Sacramento plant gives the partnership a physical production target. A month after the June announcement, in July, Peak disclosed the Sacramento factory plan with its Q1 2027 production start, giving the company a hard manufacturing deadline to hit.

Landon Mossburg, Co-Founder and Chief Executive Officer of Peak Energy, said: "The investment we announce today will supercharge Peak's ability to scale and deliver as the world increasingly turns to passively cooled sodium-ion storage to solve our energy needs."

The milestones to watch

For practitioners tracking this deal, three dates and figures decide whether it pays off:

• Q1 2027 — planned production start at the 4 GWh Sacramento factory
• $1 billion+ — existing customer orders the new capital is earmarked to fulfill
• 20% — claimed energy cost reduction versus conventional storage systems

The company has framed the round around three uses: scaling domestic manufacturing, fulfilling the order backlog and expanding sodium-ion deployment into the data center market. Each is measurable, and each carries a deadline or dollar figure the market can hold the company to.

Separate built capacity from announcements here: the Sacramento plant is planned, not operating, and production timing rests on execution between now and early 2027. The $1 billion order book is the stronger near-term signal — customers have already committed.

The next market milestone is whether Sacramento hits its Q1 2027 production start. That date, more than the funding headline, determines whether Peak Energy converts its sodium-ion cost pitch into delivered gigawatt-hours.