ENI: Balancing CST production helps Eni’s oil refinery go all night


Eni S.p.A.




Oil & Gas






In execution

ENERGYNEST’s ThermalBattery™ will be part of one of the oil and gas group Eni’s industrial decarbonisation projects. The integration of the thermal storage system into the oil treatment plant contributes to significantly reducing CO2 emissions and improving energy efficiency. The team of ENERGYNEST is proud to accompany Eni in its mission to be a global decarbonization leader.

The project, located in Eni’s Gela (Sicily) production site, has the objective of integrating renewables in the industrial process, in particular for the production of steam. The ThermalBattery™ will be connected to a concentrated solar power (CSP) system based on Eni’s proprietary technology and combined with a micro-turbine for electricity production.


Ensuring security of supply and reducing emissions


By integrating the ThermalBattery™, steam production can continue continuously during the day and for several hours at night without having to resort to fossil fuels, which helps to improve the production plant’s carbon footprint. Savings of 60 tonnes of CO2 per year are possible.


Eni’s decarbonization efforts are addressing the dual challenge of satisfying increasing energy needs, while reducing emissions in line with the Paris Agreement goals. Reducing fossil fuel consumption across its oil treatment and refinery assets is an elementary contributor to Eni’s objective of reaching net zero emissions in its upstream business until 2030.

Solar thermal–to–power

Shift electricity feed in of CSP plants
Already today, Concentrated Solar Power (CSP) allows for energy storage as an integrated part of solar plants, enabling on-demand dispatch of electricity or heat during peak hours, or even 24/7 base-load operation. However, current thermal energy storage solutions such as molten salts limit the scaling and long-term economic viability of such systems. Our technology offers a better solution. A key lever to realize affordable and reliable energy storage, it also comes at a lower CAPEX and OPEX. Storing thermal oil and turning it to power on demand is the technology of choice to enable the most cost-effective utilization of CSP assets: Increasing CSP flexibility and output, and lowering total costs.

Application Benefits

  • Decarbonize heat immediately
  • Save money easily
  • Reduce maintenance effort

Solar thermal–to–steam

Enable optimal utilization of CST plants
The sun has incredible power. Especially south of the 45th latitude, Concentrated Solar Thermal (CST) power using parabolic through-systems will be among the cheapest technologies to produce carbon-free industrial process heat. But without storage, customers are left with a cold dark night ahead when the CST plant does not produce anymore, but process heat and steam is needed. Storing solar thermal as steam is the technology of choice to best utilize CST assets, recycling excess energy for steam production – enabling true decarbonization.

Application Benefits

  • Decarbonize heat immediately
  • Save money easily
  • Reduce maintenance effort
  • Limit energy market exposure

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