Antares clears a DOE gate, Finland licenses Onkalo, QuantumScape and Saft

Antares Mark-1 gets its DOE safety design agreement

The Department of Energy has approved the Nuclear Safety Design Agreement for Mark-1, the first electricity-producing reactor from microreactor developer Antares, the company announced on October 23, 2026. Antares calls it the first step in DOE's authorization pathway for Mark-1: the agreement sets the design requirements, safety analysis approach and regulatory expectations that will govern the reactor through construction and operation. Mark-1 uses the same full-scale core, TRISO fuel and test facility at Idaho National Laboratory as Mark-0, which reached criticality there on June 4, 2026, and adds a nitrogen closed Brayton cycle power conversion system.

The run length depends on which paragraph you read. The release says Mark-1 is designed to operate at full electrical power for several months in 2027; chief executive Jordan Bramble, quoted in the same release, says six. Mark-0 went from its own design agreement in October 2025 to criticality in eight months, per Antares, with DOE approving its Preliminary Documented Safety Analysis and its Documented Safety Analysis along the way, and Mark-1 now follows the same sequence. Antares says data from the 2027 campaign will support deliveries to defense customers beginning in 2028, including the first of multiple reactors at Fort Bragg, North Carolina, under the Army's Janus program.

QuantumScape plans a 100 MWh line as PowerCo pauses payments

QuantumScape plans a 100 MWh cell production line, with start of production targeted for 2028 and Germany's Muehlbauer Group supplying cell assembly equipment, the company told shareholders on October 21, 2026. The letter says the line "will represent the first commercial-scale mass production of QS cells, with output aimed at meeting the rapidly emerging opportunities for our QSDC and QSAS business verticals." QSDC targets in-rack energy storage for AI data centers; QSAS lists application areas including defense, aerospace, medical devices and consumer electronics. The same-day release names AI data centers, aerospace and defense as demand markets. Muehlbauer evaluated the processes of QuantumScape's Eagle Line pilot facility in San Jose and developed design enhancements for mass production, the release says, and engineering work on higher-throughput processes and equipment is underway. Neither document says where the line will be built.

Its Volkswagen-owned partner was renegotiating the same day. QuantumScape's quarterly report, filed October 23, says that on October 21 it and PowerCo, the Volkswagen Group battery company, amended their collaboration agreement to remove $7.0 million of transition payments due from PowerCo and to negotiate a revised scope of work and payments, including applications beyond automotive such as data centers or robotics. During that negotiation, PowerCo will not make milestone payments.

Saft opens solid-state lines in Bordeaux, size unstated

Saft, the battery maker wholly owned by TotalEnergies, inaugurated new production lines for solid-state batteries at its Bordeaux site on October 19, 2026, according to its release. The electrolyte combines sulfide and polymer technologies at room temperature, and Saft says it will be the first French manufacturer with the capacity to develop and produce solid-state batteries that use both; the headline shortens that to "France's First Solid-State Batteries." Its release credits solid-state batteries with energy density up to 50% higher than classic lithium-ion batteries, and says Saft's are made with a dry electrode process that cuts CO2 emissions from that production stage by up to 40%.

The target markets are aviation and space, where Saft says it has already delivered semi-solid state cells for the evaluation of future electric and hybrid aircraft architectures. Chief executive Cedric Duclos says the lines turn several years of research into real industrial capacity. The release puts no number on that capacity: it gives no output, investment or customer delivery date. Another solid-state plant in France came with a number: ProLogium's Dunkirk gigafactory, which broke ground in February 2026, has a first phase designed for 4.0 GWh of annual capacity, to be reached progressively by 2030.

Finland licenses Onkalo, the first spent-fuel repository to get one

The Finnish Government granted Posiva the operating licence for its spent nuclear fuel encapsulation and final disposal facility at Olkiluoto on October 22, 2026, Posiva announced, calling it the first operating licence anywhere in the world for the final disposal of spent nuclear fuel. Posiva, owned by the utilities TVO and Fortum, says the safety assessment the Radiation and Nuclear Safety Authority (STUK) issued in August was the central rationale for the decision. According to the government, as reported by NucNet, the licence covers a maximum of 6,500 tonnes of uranium in spent fuel from the Olkiluoto and Loviisa plants, about 3,300 disposal canisters, with a plan to dispose of at most 60 canisters a year. The government's own release could not be retrieved for this roundup; those figures are NucNet's account of it.

A licence is not a start date. Posiva says the decision does not imply an immediate start to production operation: it will first finish commissioning, with tests and inspections STUK also needs to verify and approve, and it gives no detailed schedule. STUK said in its August 4 statement that before operations begin it will confirm in a separate decision that the facility meets all the safety requirements set for the start of operation. After a process Posiva says has run for more than 40 years, the next gate is that STUK decision, and neither Posiva nor STUK has put a date on it.