There is an interesting technology that is slowly edging into the telecom industry. There are a handful of places that are using hydrogen fuel cell generators instead of the more standard diesel generators for backup power. Everybody who works with a telecom network is aware of the wide use of diesel backup generators that kick in when commercial power fails. Diesel generators are permanently installed for critical hub sites, and telecom companies use portable generators that can be quickly driven to remote powered sites like huts and cabinets.
Diesel generators have a few drawbacks. Diesel fuel in notoriously challenging to use in very cold weather. Diesel generators also expel clouds of oily smoke. The biggest downside to diesel generators is that they are loud – the larger the generator, the louder. The largest diesel generators used for large sites like data centers can operate at 110 decibels, the same sound level as a rock concert. One of the biggest complaints about neighbors of data centers is the loud noise when generators are being tested.
Hydrogen fuel cells offer an alternative to the shortcomings of diesel generators. They are nearly silent in operation. The technology doesn’t generate any heat. Most impressively, hydrogen generators don’t generate any pollution since the waste product of a hydrogen fuel cell is water.
Hydrogen fuel cells operate by a simple chemical reaction. In a hydrogen fuel cell, pure hydrogen is passed by an anode that separates the hydrogen molecule into protons and electrons. The electrons are used to power the applicable application, such as the electricity from the backup generator. The protons are passed through an electrolytic membrane where they combine with oxygen to form water.
Hydrogen fuel cell technology has been used in practical applications for decades. An early version of a hydrogen fuel cell was used to provide the electricity for the Apollo spacecraft in the 1960s. The technology began to be practically used in the 1990s when cities created zero-emission bus fleets operated by hydrogen. There are now delivery trucks that use hydrogen technology. There have been successful tests using hydrogen fuel cells to power trains and airplanes. Most car companies have experimented with making hydrogen-fueled cars. Several countries are experimenting with hydrogen power in submarines because of the silent operation and the lack of heat.
Hydrogen fuel cells have a potential place in telecom. In 2020, Microsoft was able to operate a data center continuously for two days with hydrogen fuel cell generators. Tele2 and Telia are using hydrogen fuel cell generators for telecom sites in Estonia.
https://www.popularmechanics.com/science/a33499249/microsoft-hydrogen-generator-test/
There are practical downsides to using hydrogen on a commercial basis, although cities with fleets of hydrogen buses have solved the biggest problems. Hydrogen has a low volumetric energy density, which requires storing it in large quantities. Bus fleets have solved this issue by storing hydrogen in vehicles at high pressure, which carries a different set of risks. Hydrogen is flammable, but so are fossil fuels used for combustion generators. The solution to the widespread use of hydrogen as a fuel would be to develop hydrogen depots, which would be the equivalent of gas stations, where hydrogen canisters could be refilled or swapped.
For now, the biggest downside is probably the upfront cost of the generators and the infrastructure that is needed to store the gas to support them. However, cities say that ongoing costs compare favorably to diesel generators. The number one way to get costs down would be widespread adoption, which would bring economies of scale to manufacturing the units.
This seems like a technology that data center operators should be interested in. The public is increasingly pushing back against the noise and pollution created by data centers, and hydrogen generators would help to lessen the negative impacts on those living close to a data center.







