Three studies test cleaner power’s reach, materials and claims

Three studies explore delivery, materials and electricity claims

These recent papers ask three different questions about making cleaner electricity useful and credible. One reviews ways to send power without a cable, including possible uses in space. One reports a laboratory approach to reducing iridium in equipment that makes hydrogen from water. The third uses a computer model to examine rules for corporate claims about clean electricity. ¹²³

They are not three parts of one experiment, and none settles its wider question. Each is a preprint: a research paper shared publicly before other scientists have checked it through peer review. The first is a review of technologies and evidence; the second reports experimental work on electrolyser cells; the third is a modelling analysis. Their findings are useful signals, not final verdicts.

The practical questions differ too. Wireless transfer must deliver usable energy under real operating conditions. A lower-material electrode must last and work at scale. Electricity accounting rules must reflect when and where power can actually be delivered. The studies offer evidence on parts of these challenges, not a complete answer.

Wireless power may help when energy and users are far apart

The review asks where wireless energy transfer could be useful in space, and how different technologies and mission designs compare. It surveys methods including inductive and resonant transfer at short range, microwave or millimetre-wave beams, and optical or laser-based transfer. It also considers spacecraft, lunar operations and space-based solar power. ¹

Rather than testing one working system, the authors organise existing technologies, proposed mission designs and evidence by how energy is transferred and measured. They conclude that wireless transfer may be most valuable when the place or time of energy generation does not match the needs of a load. It is not a universal replacement for local generation or stored energy. ¹

The review also warns that efficiency figures are not directly comparable unless they measure energy at the same points in a system. Energy can be lost in collecting a beam, converting it, or delivering it to a useful load. Some high-power ground demonstrations and short-range flight uses are relatively established, while long-range transfer between spacecraft and lunar energy networks are supported mainly by models and mission studies rather than hardware demonstrations. ¹

This review does not show that large-scale power beaming in space is ready for routine use, or give a single efficiency figure that applies to every design. For ordinary readers, the potential relevance is indirect: if these systems become practical, they could help supply remote equipment where cables or local power sources are difficult. The review says that real-world performance, reliability, heat management and other mission constraints still need testing. ¹

A laboratory anode used about one-seventh as much iridium

The researchers wanted to reduce reliance on iridium, a scarce catalyst material used in proton exchange membrane water electrolysis. This process uses electricity to split water and make hydrogen. They made catalyst layers directly on specially designed porous supports using atomic layer deposition, a method for laying down very thin films. ²

In cell tests, one thermally deposited anode had an iridium loading of 0.21 milligrams per square centimetre and performance comparable to a commercial catalyst-coated membrane anode, despite using seven times less iridium. Its performance was maintained through an accelerated durability test described as equivalent to 600 hours of intermittent operation. A different plasma-based process lowered iridium loading further, to 0.04 milligrams per square centimetre, but produced a less active catalyst. ²

This is experimental evidence from electrolyser cells, not a demonstration of a commercial plant running for years. The reported durability test is accelerated, and the source does not establish how the process will perform at industrial scale, what it would cost to manufacture, or how reliably it would operate over a full service life. The paper is also a preprint awaiting peer review. ²

If the approach holds up beyond these tests, using less iridium per unit of equipment could ease one material constraint on expanding hydrogen production. That matters because hydrogen made with electricity can serve as an energy carrier or an industrial feedstock. The study itself does not establish that the hydrogen would be low-emissions in every use; that depends in part on the electricity used. ²

Narrower geographic rules raised modelled costs and emissions savings

The modelling study examines how corporate claims about purchased clean electricity might change if accounting rules required a closer match between electricity use and clean generation in time and place. It focuses on Scope 2 accounting, which covers emissions associated with purchased electricity, and compares geographic deliverability zones and policy scenarios. ³

Across most scenarios, narrower geographic zones were associated in the model with greater consequential emissions reductions and higher prices for energy attribute certificates, or EACs. These certificates are used to support claims about clean electricity. In the reference technology scenario, the model favoured natural gas with carbon capture and storage to meet new clean-electricity demand. When that option was unavailable, it instead deployed wind and solar. The highest certificate prices occurred in scenarios combining limited technology choices with finer geographic boundaries. ³

These are model results, not measured outcomes from companies that changed their purchasing rules. The source reports variation across regions and assumptions, so the result is not a single price estimate or a guarantee that tighter rules will always cut emissions by the same amount. It also does not establish the effects of every possible accounting policy. ³

For readers, the study highlights a trade-off in how clean-electricity claims are defined: closer matching may make claims more connected to local electricity supply and may lead to greater modelled emissions reductions, but it can also raise procurement costs. Those costs and effects could differ by location and technology options. The paper does not determine which rules policymakers or companies should adopt. ³

Together, the papers point to conditions rather than a single solution

Taken together, the studies suggest that cleaner power depends on more than building generation. It can also depend on moving energy to where it is needed, using key materials efficiently, and making claims that reflect the electricity available to users. ¹²³

But the evidence is at different stages. The space-power paper reviews a mixed field, including concepts that still lack hardware demonstrations. The iridium paper reports promising cell-level results that need broader testing. The accounting paper shows how assumptions can affect modelled emissions and costs, rather than reporting the results of an adopted rule. ¹²³

The shared caution is straightforward: promising results do not by themselves show what will work at scale or what it will cost in practice. Independent review and further testing will help clarify how far each finding can be applied.