Hydrogen, a colourless and odourless gas, is the most abundant element in the universe. It has a high energy content and can be produced from a variety of sources, including natural gas, coal, biomass, and variable renewables. It has been recognized as a promising alternative energy carrier that can contribute to a sustainable and low-carbon energy future. Its diverse range of applications across various sectors, including transportation, industry, and power generation, has garnered significant interest from governments, industry, and academia. Most hydrogen today is still produced as a by-product of fossil-fuel refinement – using methane with carbon monoxide as a by-product. Meanwhile, the hydrogen produced by electrolysis represents less than 1 percent of all the world’s hydrogen production. In order for hydrogen to be a viable source of clean energy, the cost of electrolysis needs to decrease significantly. One way to achieve it could be usage of a digital twins – a computer-simulation programs that can track and adjust the operations of a physical device in great detail. The close monitoring of hydrogen electrolyzers that digital twins provide could help streamline the devices’ operation and bring down the cost of electrolysis as a result. Firstly, a digital twins could reduce the cost of electrolysis is by monitoring the technical performance of electrolyzers. It can track the operations of electrolyzer components like electrodes, membranes, or pumps to see which parts may be likely to fail and to proactively make recommendations for scheduling maintenance. such prediction maintenance capabilities could save operators many hours of production time when electrolyzers would otherwise be taken offline to enable unscheduled troubleshooting. Secondly, digital twins can help operators by having direct control over electrolyzers. Rather useful application of direct control can be adjustment of electrolyzers’ energy consumption based on the power grid’s current energy mix. When larger amount of renewable electricity is fed into the system, digital twins can direct electrolyzers to ramp up production, therefore making the production of hydrogen even greener.