Key Highlights

● Plug Power will Supply 280 megawatts of GenEco electrolyzers for Arcadia eFuels' Project ENDOR in Denmark.

● The companies also struck a broader Partnership covering more than one gigawatt of potential future projects.

● Equipment deliveries begin only once Project ENDOR issues a notice to proceed, so Revenue timing remains uncertain.

● Sources disagreed on the gain, and one said the rally cooled during the day with a close at $1.91.

Plug Power Inc. (NASDAQ:PLUG) rose on Tuesday, September 29, 2026, after the hydrogen company announced a 280-megawatt electrolyzer supply agreement with Arcadia eFuels. The shares finished higher, though sources disagreed on how much: one showed a solid gain, while another said the rally cooled during the day and that the stock closed at $1.91.

The Arcadia eFuels Deal

Plug will supply 280 megawatts of its GenEco electrolyzers for Arcadia eFuels' Project ENDOR in Denmark, a project aimed at producing sustainable aviation fuel. The two companies also struck a broader partnership covering more than one gigawatt of potential future projects. There is an important condition: the company said equipment deliveries will begin once Project ENDOR issues a notice to proceed. In project finance, that is the formal green light that follows final Investment decisions and permits, so the timing of revenue from the order remains uncertain.

Why Electrolyzers Matter

Electrolyzers use electricity to split water into hydrogen and oxygen. When the power comes from renewable sources the output is often called green hydrogen, which can be combined with captured carbon to make synthetic fuels, including jet fuel usable in existing aircraft engines. Airlines have few other ways to cut emissions from long-haul flights, and Europe has pushed them toward cleaner fuels, making Denmark a natural location.

Plug's Pipeline

Plug has spent years building its electrolyzer Business alongside fuel cells and hydrogen supply. A large order from a fuel project adds to that pipeline, and the more-than-one-gigawatt partnership suggests potential beyond the initial order.

Clean Energy in the Spotlight

Bloom Energy rallied after Jefferies raised its price target and Oracle reaffirmed a fuel-cell commitment, and FuelCell Energy jumped early after Oppenheimer started coverage at Outperform. Nuclear names drew attention after the Nuclear Regulatory Commission reportedly issued its first U.S. commercial small modular reactor construction permit, to the Tennessee Valley Authority.

The Bigger Picture

The S&P 500 slipped 12.85 points, or 0.17%, to 7,670.84, while the Dow Jones Industrial Average fell 131.59 points to 51,349.92 and the Nasdaq Composite finished nearly flat at 26,797.54. The Russell 2000 finished lower, with closing figures from different sources clustered between roughly 2,807 and 2,810. West Texas Intermediate crude settled $3.22 lower at $89.38 a barrel as Middle East exports recovered. Energy finished last among S&P 500 sectors while utilities led.

Milestones and Rates

The key milestone is the notice to proceed for Project ENDOR. Higher borrowing costs matter for capital-heavy clean-energy projects. GDP and August PCE Inflation arrive on Wednesday, September 30, Nike reports on Thursday, October 1, and the September jobs report follows on Friday, October 2.