Form Energy’s Down Round Masks a Fourfold Order Backlog

Form Energy just raised $750 million at a valuation roughly 40% below its last round. Its order backlog quadrupled in the same stretch.

That is the whole story in two lines, and it is worth sitting with, because it inverts the usual signal. Normally a fourfold jump in committed demand is the thing that justifies a higher price. Here the company's value went the other way while the orders piled up.

Long-duration energy storage (LDES) is the piece of the grid that lithium-ion batteries cannot economically reach. Lithium handles the daily four-to-six-hour shift. Multi-day gaps, when wind stops for three days or winter solar runs dry, need something cheaper and far longer. That is the hole iron-air is built for.

The battery works on a reaction every schoolchild has seen. Iron rusts, releasing electrons. Reverse the process, and the rust turns back to iron while storing charge. That chemistry, running on iron, water and air instead of lithium, cobalt and nickel, is what lets Form undercut the price of incumbent storage on long durations.

TIMELINE: Form Energy — from Series F to a down-round
─────────────────────────────────────────────────────────────
  2021          2024                2026 (Feb)        2026 (Aug)          NEXT
  🔬            💰                  🛰                ◉ NOW              🔥 2027
  Unveils       Series F $405M      Google 30GWh      Series G $750M     Crusoe 12GWh
  iron-air      ~$3B pre-money      Xcel deal         $1.75B pre-money   deliveries
  tech                                   │                                  start
                                    backlog 20→80GWh

The unusual part is the sequence of events around the raise. Form grew its backlog from roughly 20 GWh to 80 GWh earlier this year, a fourfold jump, on agreements with Google, Crusoe, Xcel Energy and FuturEnergy Ireland. Google alone committed to a 30 GWh system tied to a Minnesota data center, a deal the industry values near $1 billion. Crusoe reserved 12 GWh for AI data centers starting in 2027.

And yet the money priced the company down. Axios Pro reported the $1.75 billion pre-money figure, down from about $3 billion in the October 2024 cycle. T. Rowe Price led both rounds — the same investor that set the 2024 price set this one. On pre-money terms the company is marked roughly 42% lower than it was two years ago, despite a quarter that looked, on its face, like pure acceleration.

Why the valuation and the orders moved apart

The simplest reading is that Form's technology matured into a commercial business, and the market repriced it from venture-valuation territory toward something closer to an industrial manufacturer. A gigafactory eats capital. Form is roughly doubling its Weirton, West Virginia plant, a one-million-square-foot facility on the site of a former steel mill, to chase the backlog. At full capacity the plant is designed to make 500 megawatts of batteries a year.

There is a harder reading underneath. The order book rests on a small set of buyers, and one hyperscaler holds a large share of it. A single pause in Google's data-center capex would reprice the whole plan. Northvolt raised billions against a similarly crowded order book and entered bankruptcy in 2025 with its flagship plant far below planned output.

The demand itself is real and structural. US data-center electricity use is projected to quadruple by 2035, reaching about 20% of all power generated. Carrying that load on renewables requires storage that bridges multi-day gaps, not just evening peaks. The US installed 9.7 gigawatt-hours of storage in the first quarter, up 32% year over year, and most of it discharges for a few hours. The multi-day layer is the unfilled piece.

The turning point

The decisive shift was the Google order in February. Before it, Form had credibility as a technology and a factory, but no customer at that scale. The 30 GWh commitment changed the conversation from whether the chemistry worked to how fast the factory could ship. That is why the Series G was structured the way it was: Morgan Stanley as sole placement agent, an executive bench expanded with a chief financial officer and a chief operating officer hired from Panasonic's North American battery operation.

All of that is the behaviour of a company preparing for industrial-scale production, not a venture round in search of a narrative.

As we wrote in August, the long-duration storage comparison is settling into tiers: lithium for daily cycling, iron-air and its peers for the weekly and seasonal gap. Form is the furthest along of the iron-air group, but it is no longer alone. Dutch startup Ore Energy raised $43 million this month on the same rusting-and-derusting chemistry, and India's Meine Electric claims the APAC-first position with a pilot at an NTPC plant. The category is real; the moat is manufacturing execution.

We also flagged in September how grid batteries set a record in 2025 and then cut their own revenue by cannibalizing the same peak prices they used to capture. That dynamic is why multi-day storage matters: the more short-duration batteries saturate the daily arbitrage, the more the value shifts to the long-duration layer that lithium cannot serve economically.

What the down-round means for investors

The paradox deserves a clear-eyed read. A down round is rarely a positive signal on its own, and it is worth noting the company did not confirm the valuation itself. Axios attributed both figures to its own reporting.

But the direction of the two curves tells the real story. The order backlog went up 4x while the valuation went down 42%. For a capital-intensive manufacturer, the number that matters is unit economics and delivery, not the mark on the last venture round. Form's cost target of under $20 per kilowatt-hour at 100-hour durations, if reached, would put multi-day storage at roughly a tenth of lithium-ion's installed cost for that duty cycle.

Form Energy is no longer a speculative bet on a battery chemistry. It is a test of whether a venture-backed company can execute an industrial scale-up against an order book that grew faster than its manufacturing. The down-round is the market pricing in that execution risk honestly.

The next funding round will resolve the paradox. If Form reaches run rate and ships against the backlog, the reset looks like a bargain. If the factory slips and the concentration risk shows, the lower price was the market seeing the future clearly. The two lines — valuation down, orders up — will either converge or the market was right the first time.