Helical Fusion to Start Power-On Tests at Helix HARUKA in 2027

The company opened the Toki site to reporters on 29 September, according to The Asahi Shimbun, which reported the timeline on 30 September. Helix HARUKA is described as Japan's first integrated pilot reactor using the helical approach, a design that twists magnetic fields to confine plasma without the large plasma currents that tokamaks rely on.

Helical Fusion says it completed a performance test of a high-temperature superconducting coil in 2025, replicating the magnetic environment inside a fusion device and achieving stable current flow under superconducting conditions, which it calls a world first. That result, the company says, cleared a hurdle for manufacturing and constructing the integrated demonstration reactor.

If first-stage tests succeed, the plan is to install a second coil and other major components, including a liquid-metal wall blanket, before power-on tests of the completed integrated facility around 2030. The company then intends to follow HARUKA with HELIX KANATA, a larger reactor with a net power output of 50 MW, and to begin full-scale investment in the 2030s.

CEO Takaya Taguchi told reporters the company aims to build a commercial power plant as early as the 2040s. He also said that before commercial operations can begin there are various hurdles beyond the technical ones, including cost, safety and construction speed.

The political backdrop is friendly. Prime Minister Sanae Takaichi is a strong supporter of the fusion industry, and the government has designated fusion energy as one of 17 strategic sectors, with plans to invest 3.1 trillion yen ($19.7 billion) through public and private funding by the 2040 financial year, according to the Asahi report.

Helical Fusion is the sole private-sector inheritor of helical fusion technology developed by NIFS, one of the world's largest fusion research facilities. It aims to develop the world's first commercially viable fusion power plant based on the helical design. That is a long claim: 70 years of research have yet to yield a commercially viable reactor, as the same report notes.

Public research money moves while companies promise

The Japanese timeline sits inside a wider push. On 28 September, according to pv magazine, EnergyPathways announced a proposed fundraise for the Marram Energy Storage Hub, a compressed air project in salt caverns under the East Irish Sea. That is storage rather than fusion, but it shows the same pattern of pre-revenue companies courting state support schemes before committing capital.

EnergyPathways CEO Ben Clube told pv magazine the company skipped the first round of the UK's long-duration energy storage cap-and-floor scheme and is waiting for a second round expected toward the end of this year. MESH is planned as a 300 MW/55.2 GWh first phase, with a final investment decision targeted for 2028 and operations by the end of 2031, subject to consents and Ofgem support.

Fusion has its own version of that argument. The Asahi report notes the company's HELIX KANATA target of 50 MW net output, but offers no date for when that machine would be built. The commercial plant remains a 2040s aspiration.

Meanwhile, the security side of the energy buildout is getting harder to ignore. SemiEngineering reported on 1 October that President Trump signed an executive order on 26 August declaring a national emergency to ban or restrict high-risk foreign-produced equipment in the US electric grid, covering equipment operating at 69 kilovolts or above, including large transformers, grid-tied inverters, battery storage, SCADA software and industrial control systems.

No vendor has been named yet. The specifics do not exist until the Department of Energy publishes implementing rules, due 24 December 2026, which may take the form of a prohibited-entity list, a pre-qualified vendor white list, or both, according to the same account.

The order also reaches backwards. Transactions after 26 August 2026 can be restricted, and the Secretary of Energy can require equipment installed before that date to be monitored, disconnected, replaced or removed. Western vendors are not automatically clear, because a US or European manufacturer sourcing critical sub-components from a covered jurisdiction may still find its finished product restricted.

Transmission and data centres compete for the same grid

On the same day, Canary Media reported that a bipartisan Senate permitting bill unveiled on 30 September could streamline high-voltage power line buildout. Analysis commissioned by the Center for Climate and Energy Solutions, and conducted by Greenline Insights, found the reforms could cut the cost of delivering electricity by roughly $7 billion by 2035 compared with a business-as-usual scenario, a net saving after $1.9 billion in new transmission investment, and reduce residential electricity bills by about $1.1 billion.

Ashna Aggarwal, Greenline Insights' director of analysis, said the modeling indicated the reforms could enable almost 100 gigawatts more wind, solar and battery storage, plus nearly 40 GW of increased interregional transmission capacity. Rob Gramlich, president of consultancy Grid Strategies, said it is very likely the bill, if passed, would reduce consumer utility bills over time.

The bill's fate is unclear. The House has been adjourned by Speaker Mike Johnson until after the November midterm elections, and Republicans and Democrats have argued over environmental permitting changes, Canary Media reported.

One night earlier, Senate Democrats blocked the Ratepayer Protection Act, which would have required utilities to consider standards so that data centres pick up the cost of transmission, generation and distribution upgrades that can otherwise be passed to households. The Guardian reported the vote was 57 to 43, short of the 60 needed to advance. Four Democrats joined Republicans: Maggie Hassan of New Hampshire, Amy Klobuchar of Minnesota, and both Georgia senators, Jon Ossoff and Raphael Warnock.

Senate Democratic leader Chuck Schumer called the measure toothless and said relying on self-regulation is how we got into this mess, referring to a meeting between Trump and tech executives. Ohio Republican Jon Husted, who championed the bill, said big tech should be paying its own way.

None of this settles whether Helical Fusion's 2027 power-on tests will happen on schedule. The hardware is the easy part to check. The funding, the regulation and the grid connection are not.