Thermal energy jobs

Thermal Engineering Jobs in Renewable Energy

Thermal engineering is the design and analysis of systems that move, store, and convert heat, from heat exchangers and boilers to insulation, cooling loops, and the heat-transfer models that decide how large each component must be. In renewable energy the discipline matters because heat is the hardest part of the energy system to decarbonise: it accounts for almost half of global final energy consumption and 37% of energy-related CO2 emissions, yet renewables supplied only 14% of it in 2024.

What thermal engineers do in clean energy

The job title rarely says "thermal". Most openings on Rejobs are for mechanical engineers, project engineers, and simulation specialists whose daily work is thermal: sizing heat exchangers, running CFD models of airflow and temperature, specifying refractory materials, and checking that a component survives thousands of heating and cooling cycles. The skills transfer from conventional power stations, refineries, and HVAC, which is why this is one of the easier routes into the sector for experienced mechanical engineers. What changes is the operating profile. A heat battery or a district heating plant fed by renewables cycles daily or even hourly rather than running at steady load, and fatigue, thermal stress, and heat losses become design problems in their own right.

Industrial heat storage

The densest hiring comes from companies building thermal energy storage for industry: systems that charge on cheap renewable electricity and release heat or steam when a factory needs it. Antora Energy heats solid carbon blocks in its San Jose operation and posts the most thermal roles on Rejobs, from mechanical design and structural engineers to test equipment specialists. Rondo Energy builds brick-based heat batteries for industrial steam, and Norway's Kyoto Group sells molten-salt storage for process heat. The IEA expects electricity to supply 12% of global industrial process heat by 2030, up from 4% in 2024, and renewable electricity to account for nearly 80% of the growth in renewable industrial heat. Every one of those installations needs engineers who can model heat flows at several hundred degrees Celsius.

District heating and cooling

The older, larger employer base is district heating. City utilities are replacing coal and gas boilers with large heat pumps, electric boilers, waste heat, and storage tanks, and each conversion needs thermal design, hydraulic modelling, and plant commissioning. BEW Berliner Energie und Wärme, which runs Berlin's heat network, hires project engineers and plant operators for that shift, and Vicinity Energy is electrifying steam networks in US city centres.

Fusion and emerging niches

A smaller but well-paid tier sits in fusion. Commonwealth Fusion Systems, Helion Energy, and Thea Energy recruit mechanical engineers for cryogenic cooling of superconducting magnets and for removing heat from components facing the plasma, some of the most demanding heat-transfer problems in engineering. Candidates who combine CFD or finite-element simulation with hands-on test experience have the widest choice, because the same modelling skills serve heat batteries, heat networks, and fusion prototypes alike.