When it comes to the energy transition, the debate often centers on renewables, energy storage and decarbonization. However, there is one technology that is gaining ground in a increasingly tangible way in distributed generation: fuel cells. The reason is simple. They produce electricity and heat continuously as long as fuel is supplied, but without direct combustion. This makes them particularly attractive to those seeking efficiency, operational continuity and a reduced environmental impact compared to traditional systems.
For energy-intensive companies, the issue is not just technological—it’s strategic. A fuel cell can become a key component of a more autonomous, efficient and predictable energy system, especially when integrated into an on-site self-generation strategy. It is no coincidence that the most promising applications are concentrated precisely in contexts where the reliability and quality of the electricity supply matter just as much as the cost of energy.
In this guide , we’ll explore what a fuel cell is, how it works, the main types available, the advantages it offers over conventional systems, and why it is now one of the most promising technologies for clean energy generation in industrial and distributed settings.
What Is a Fuel Cell and How Does It Work?
A fuel cell is an electrochemical device that converts the chemical energy of a fuel into electricity and heat. Unlike an engine or a turbine, it does not generate energy through combustion. The process takes place in a cell consisting of an anode, a cathode and an electrolyte: the fuel reaches the anode, air reaches the cathode, and the electrochemical reaction produces electricity, water and heat. The U.S. Department of Energy explains how it works with a simple example: in PEM fuel cells, the catalyst splits hydrogen into protons and electrons; the electrons flow through an external circuit, generating current, while the protons pass through the electrolyte and recombine at the cathode with oxygen and electrons, forming water and heat.
This is the basic principle, but in practice the picture is broader. Not all fuel cells operate in the same way, and not all require the same fuel. Some technologies operate with high-purity hydrogen; others, especially high-temperature fuel cells, can also operate on natural gas, biogas, or biomethane, thanks to their ability to manage internal or integrated reforming processes. This is an important point because it makes fuel cells relevant not only in the realm of pure hydrogen but also in gradual energy transition pathways.
To understand their value, one needs only compare them with traditional systems. In a fuel cell, the absence of direct combustion drastically reduces the formation of certain pollutants typical of thermal processes, such as NOx, SOx and CO. Furthermore, the heat generated can be recovered and utilized, making the cell a particularly attractive solution for cogeneration and on-site energy production applications .
Types of Fuel Cells and Applications
Not all fuel cells are the same. They differ in terms of electrolyte, operating temperature, fuel, dynamic response and scope of application. For an article focused on distributed and industrial power generation, the three most relevant families to consider are PEMFC, SOFC and PAFC.
PEMFC: Rapid Response and Mobility
PEMFCs (Polymer Electrolyte Membrane Fuel Cells) use a proton-conducting polymer membrane. They operate at relatively low temperatures and can rapidly adjust their power output based on demand. For this reason , they are considered particularly well-suited for mobility, but they are also used in some stationary applications. Their main limitation is that, in a standard configuration, they cannot directly use hydrocarbon fuels such as natural gas or ethanol without a dedicated reformer.
SOFC: High Temperature and Stationary Use
SOFCs (Solid Oxide Fuel Cells) use a solid ceramic electrolyte and operate at high temperatures. They are among the most promising technologies for stationary power generation and industrial use because they can internally reform natural gas and biogas and, in certain configurations, be paired with a turbine to achieve very high levels of electrical efficiency. It is precisely this family of cells that is particularly relevant today in advanced on-site power generation projects.
PAFC: Mature stationary applications
PAFCs (Phosphoric Acid Fuel Cells) use phosphoric acid as an electrolyte and operate at around 200 °C. They are a historically important technology for medium-sized stationary applications, often in hotels, hospitals, office buildings and large complexes, where waste heat can also be recovered and utilized. This makes them suitable for settings where electricity and heat must be generated simultaneously on an ongoing basis.
Where they are used today
From an application standpoint, fuel cells are used across four major areas: mobility, buildings and large complexes, industry and highly reliable distributed generation. In the manufacturing sector, interest in them grows when there is a need for clean, continuous on-site energy; in more advanced settings, they can become part of a strategy that combines self-generation, heat recovery and progressive decarbonization.
Advantages of Fuel Cells Over Traditional Systems
The primary advantage of fuel cells is efficiency. Since they convert chemical energy into electricity through an electrochemical rather than a thermal process, they avoid some of the losses typical of conventional systems. The DOE reports that in combined heat and power configurations , overall efficiency can reach up to 90%; in the case of SOFCs, electrical efficiency can increase further if the system is combined with a turbine.
The second advantage is the absence of direct combustion. This has very tangible consequences: lower local emissions, an almost total absence of pollutants such as NOx, SOx and CO, and a significant reduction in CO₂ emissions compared to many traditional configurations. On the pages dedicated to NOVA, Cefla highlights this very aspect, also emphasizing that no flue gas treatment is needed and the technology’s low environmental impact.
For companies, however, the most attractive benefit is often another: the ability to generate reliable on-site energy. A well-integrated fuel cell platform offers continuous power generation, high-quality energy and greater control over the on-site supply. This is particularly useful in settings where downtime, fluctuations or outages come at a very high cost. In its proposal for NOVA, Cefla highlights a 24/7 continuous production model , modularity at 260 or 325 kWe, and easy installation thanks to a plug-and-play configuration.
There is also the issue of flexibility in the transition path. The most advanced fuel cells are not just interesting because they represent the future; they are interesting because they enable a credible transition starting today. The ability to operate on natural gas, biomethane, biogas, hydrogen blends and—in the future—even 100% hydrogen makes this technology particularly well-suited for industrial processes that cannot change everything at once but must progressively increase efficiency and sustainability.
Cefla’s Commitment to Clean Energy Generation
In the field of distributed energy generation, Cefla’s approach to fuel cells is based on a very clear logic: transforming an advanced technology into a concrete solution for businesses and communities that want to produce energy in a cleaner, more continuous and more controllable way. In this scenario NOVA SOLUTION by Cefla is a solution that integrates Bloom Energy’s Energy Server™ fuel cell module and is presented as a platform to support the transition from combustion-based sources to more sustainable configurations. The page dedicated to the solution highlights efficiency exceeding 80%, continuous 24-hour production , modularity and the ability to customize power output.
One of the most interesting aspects is its energy versatility. In the solution’s description, fuel cells are presented as high-efficiency systems capable of operating on various fuel sources: natural gas, biomethane, biogas, hydrogen blends and 100% hydrogen. This makes the technology particularly relevant for those seeking to develop a strategy for gradual decarbonization without any impact on industrial continuity and resilience.
Further cementing this point is the Racing Bulls Green Energy Park project in Faenza, one of the most useful examples demonstrating what it truly means to implement a fuel cell in a real-world setting. The project integrates an advanced photovoltaic system and a NOVA SOLUTION SOFC by Cefla powered by certified biomethane sourced from local partners, all within a 14,500-square-metre complex . According to the dedicated webpage, the system enables an average annual production of 4.6 GWh of carbon-neutral electricity, while heat recovery fully covers the site’s heating needs.
It is precisely here that fuel cells demonstrate their most compelling potential: not merely as a “promising” technology, but as an energy infrastructure already applicable in high-profile projects, where reliability, sustainability and economic value must coexist. And this is why fuel cells are increasingly viewed today not as a technological curiosity, but as one of the most solid options for advancing clean energy generation on an industrial scale.
Would you like to determine whether a fuel cell solution aligns with your site’s energy consumption, operational profile and decarbonization goals?
Starting with a feasibility study is the most practical way to assess system integration, service continuity, energy benefits and the project’s economic viability. In this process, expertise in power generation, design consulting, energy efficiency and decarbonization makes all the difference between technological interest and real-world industrial application.
Published on July 20, 2026
