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Feature 26 May 2022 (ComputerWeekly)

The UK government says hydrogen is key to future energy supplies, even planning national subsidies to beef up production by the end of 2022. However, the embryonic hydrogen industry has not yet tackled the investment, sustainability and cost issues around data storage use cases.

Roberto Castaldini, the new-product-focused offering specialist at Vertiv, says the growing urgency of sustainability is driving hydrogen energy solutions for the datacentre, and incentivising investment.

“Usually datacentre and IT systems require consistent energy continuously, 24/7,” says Castaldini. “We then have a huge demand for batteries, for example, to support [intermittent] power from renewables. And there is the carbon footprint and other sustainability issues.”

Emerging hydrogen fuel-cell technologies offer potential for backup loads as well as off-grid or primary power that is reliable and sustainable, for combined heat and power applications, grid and micro-grid support. An Atos-HDF Energy venture has said its first hydrogen-powered datacentre will be online by 2023.

Meanwhile, Vertiv has joined a consortium of seven companies, including Equinix, InfraPrime, RISE, Snam and SolidPower, working with Europe’s Clean Hydrogen Partnership to develop a next-generation fuel-cell platform for datacentres.

“We are developing a UPS [uninterruptible power supply] and battery solution to go together with the fuel cell,” says Castaldini. “We are also evaluating proton exchange membrane [PEM] fuel cells as backup power sources to replace diesel generators.”

Another proof-of-concept project is developing fuel cells as a primary datacentre power system, inverting the usual approach by using grid energy as the backup power source. Of course, hydrogen fuel solutions are already produced on an industrial scale for the automotive sector.

“We want to develop UPS features in particular on the firmware side to work with this technology, and plan next year to start producing standard UPS systems that are capable of interacting with the fuel sensor,” says Castaldini.

Used in a pure-hydrogen fuel cell, the waste product is water vapour – which technically suggests zero emissions. But in the real world, emissions are also produced in the manufacture of the technology and processes including haulage and storage.

“We have brown hydrogen obtained by fossil fuels. We have blue hydrogen – also obtained via fossil fuels but with a process of CO2 capture,” he says. “What I call violet or purple hydrogen comes from nuclear. Then there is the one everybody wants, which is green hydrogen, obtained by electrolysis of water and with electricity gained by renewable sources like solar photovoltaic or wind.”

But even considering the entire technological lifecycle, introducing hydrogen energy as part of the mix will deliver a chance to reduce emissions by reducing use of fossil fuels – not least because hydrogen is typically required in comparatively low volumes per equivalent amount of energy.

“It’s hard to have the numbers right now because there are very few applications with a very precise and green lifecycle of hydrogen,” says Castaldini. “But compared to the current situation, it’s definitely an improvement.”

Europe’s Clean Hydrogen Partnership put €300.5m (£252.9m) up for grabs in its first call for proposals, in February 2022, to develop clean hydrogen technologies. To put that into perspective, the UK’s Industrial Hydrogen Accelerator fund has earmarked £26m for feasibility or risk and cost reduction proofs for hydrogen fuel – although the government said in August 2021 that it would “unlock £4bn in investment by 2030”.

Hold-ups on hydrogen adoption

Although hydrogen has few technological rivals when it comes to lower-emission, compact footprint systems for backup or primary power, it is expensive compared with the current power grid, with diesel generators as backup and batteries for short-term discharges.

Hydrogen itself also must be stored, expensively, under pressure or at very low temperatures.

Costs are starting to come down as the market grows, but regulation is another barrier. Although other industrial sectors already use hydrogen – such as glass and food production – a new framework of permissions, certifications and laws for hydrogen fuel is needed, says Castaldini.

Graham Smith, senior research scientist at the UK’s national institute of metrology, the National Physical Laboratory, calls lithium batteries “a non-starter” for daily, weekly or monthly storage on a countrywide grid scale, and in the UK, the tech and economics of other redox-flow battery types also remain unproven. That said, hydrogen could reuse existing UK gas infrastructure.

“Hydrogen storage can be done cheaply and at scale for a long time, filling underground caverns with compressed gas,” says Smith. “Storing hydrogen this way is one of the few methods available for storing enough energy to properly manage the variances in UK energy consumption from month to month and season to season.

“We already do it safely with natural gas. There are some engineering and economics questions, but they don’t require a breakthrough new technology.”

But there is a drawback: hydrogen technology for electricity generation – as opposed to transport or heating – is not quite ready for prime time yet, warns Smith, adding that the thermodynamic efficiency of the electrolysis process used in fuel cells is low – about 50%.

“This is commonly stated, but people miss the point that transitioning to a new paradigm where storage is difficult is expensive in relation to the cost of energy,” he says. “But we do still need to do it.”

Smith says a massive, energy-thirsty scale-up of UK capacity to produce electrolysers for creating hydrogen is needed – itself entailing a faster roll-out of sustainable, renewable and clean energy. Some five to 10 times the UK’s current electricity supply capabilities are needed to replace natural gas. Also, some electrolyser technologies use quite rare materials.

“For example, proton exchange membrane water electrolysis [PEMWE] solutions only use iridium-based catalysts, the supply of which is inelastic,” he says, adding that at the same time, for some 80% of end-use cases for hydrogen energy, alternatives exist, such as batteries or heat pumps.

Vidal Bharath, chief operating officer at UK hydrogen fuel cell company Bramble Energy, sees a mixture of fuel and energy sources in future, with fuel cells five times the price of a diesel engine and “thousands of pounds” per kW.

“We need to make a big step-change in the cost of exactly what we do,” he says. “Then you need quite complex, precise factories to build it. They exist but haven’t the full capacity for when you move on to the next generation of technology – and it takes 12 months to build a new factory.”

Bramble has developed a printed circuit board fuel cell (PCBFC) that it believes could be made in many printed circuit board factories. It has already launched a portable power product range and is developing a high-power density, liquid-cooled fuel system on a scalable, low-cost platform.

When it comes to safety worries, Bharath notes that society already deals daily with extremely flammable fuels, such as petrol.

But when hydrogen vents, it can happen quickly – making it potentially safer than natural gas in similar circumstances, not building up in a system before it blows. The right infrastructure can allow hydrogen to vent as and when into the atmosphere, he says.

“Loads of hydrogen” traverses UK roads every day – although the country is well behind the likes of Japan, California and Germany when it comes to hydrogen, with about 70Mt of hydrogen already used worldwide each year, says Bharath.



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