A national security order makes the cheapest cell in a grid battery the riskiest one

The person who answers for this in October is whoever signs a bill of materials for a project energizing in 2027. The cell line is the cheapest one on the page, it is Chinese ^[2], and the Department of Energy guidance that decides whether it can be installed is not expected until the end of the year ^[7].

Sourcing already faced pricing pressure on two fronts. Battery import taxes went to 25% in January from 7.5% ^[11], a rise of 17.5 points and about 3.3 times the old rate ^[1]. From 2026, new storage projects need 55% of their material cost to come from outside China and other restricted countries to qualify for tax credits ^[10], which leaves up to 45% that can still come from those countries ^[2]. Both of those fit in a model. You lose margin and keep the schedule.

The August order works differently, because it bans installing any foreign-produced bulk-power system electric equipment judged a national security risk, and it names battery energy storage systems alongside inverters and transformers ^[4]. A project can therefore clear the 55% content test and still be holding a cell it is not allowed to install ^[2]. Shan Tomouk of Benchmark Mineral Intelligence called the outright ban a surprise that creates concern even for domestic players ^[5], and it is the US developers who are holding the Chinese cells ^[2].

Teams often assume a swap means same form factor, new vendor, a couple of points of margin, but in practice the schedule absorbs the swap. BloombergNEF expects near-term deployment to slow while developers wait for the rules to become clear ^[6], and its analyst Isshu Kikuma says replacement cells, whether made domestically or imported from somewhere other than China, will likely cost more, with cancellation as the worst case ^[8].

Two questions decide whether a project's schedule holds: can this project re-spec its cell without moving its energization date, and does the contract let the cost difference pass through to the offtaker. If both are true, you have an accounting problem you can size. If you can re-spec but the contract has no pass-through, someone on your side eats the delta ^[15]. If the contract allows pass-through but there is no schedule slack, you are building on a cell whose legality depends on guidance nobody has read yet ^[7]. And if neither is true, Kikuma's worst case is your case ^[8].

The supply answer arrives later than most 2027 plans assume. LG Energy Solutions, Samsung SDI, Ford and SK On have factories set to come online or ramp by next year ^[13], helped by a slowing EV market that is pushing some vehicle-cell lines toward grid storage instead ^[14]. Even so, MIT Technology Review puts domestic capacity at around 2030, with supply not actually meeting demand until later in the 2030s ^[12]. US-made cells remain significantly more expensive than Chinese ones, and Korean imports likely are too ^[15].

For anything energizing before that, the plan that survives Friday carries a second cell source and a number for what it costs.