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AC Boilers

Stand: 12.0.MR4

AC Boilers, formerly Ansaldo Caldaie, belongs to Sofinter Group, a leading global player in engineering, procurement, manufacturing and construction of steam generators for both industrial and power generation use.

AC Boilers, the largest Italian Original Equipment Manufacturer of steam generators, is a global player providing a full range of steam generator technologies for power generation: HRSGs, large Utility boilers, Waste-to-Energy and Biomass boilers, Solar Receivers. AC Boilers operates in more than 50 countries, relying upon over 150 years of experience and 1,000 units / 80 GWe installed worldwide.

In the Energy Transition, the Steam Generation technologies are key factors enabling the "decarbonization" process to achieve a sustainable environmental impact of Thermal Power Plants through high efficiency solutions with reduced greenhouse gas emissions and pollutant abatement, ensuring “on demand” steam generation.

AC Boilers offers a wide range of products satisfying every customer’s need in the steam and power generation markets:

HRSGs for Combined Cycle Power Plants: horizontal or vertical gas flow arrangements, natural circulation drum type or Benson Once-Trough type downstream any kind and size of gas turbine, including H class with highly efficient optimized solutions for the most demanding steam temperatures and pressures of advanced Combined Cycles.

Waste to Energy and Biomass boilers: large capacity, grate fired, steam generator systems utilizing  municipal solid waste/refuse derived fuels or a variety of biomass fuels (wood chips, wood pellets, agriculture residues, recycled wood etc.) through high efficiency and low emission solutions.

Utility boilers: ultra-supercritical, supercritical, high pressure subcritical, firing any kind of fuel allowing the highest power plant efficiency whilst reducing CO2 and pollutant emissions.

Firing systems: AC Boilers is one of the front runners in Clean Combustion Technology according to BAT emission level for any type of fuel including pulverized biomass.

Solar receivers: AC Boilers technologies and expertise include Solar Receivers – molten salts type as well as direct steam generation type – for Concentrated Solar Power Plants (Tower Type).


Energy storage: AC Boilers and its partner EnergyNest have been developing the implementation of the ThermalBattery™ technology in Steam Power Plants as well as in Industrial Steam grids. The ThermalBattery™ System stores/ releases energy as high grade heat by means of a solid state media -HEATCRETE®, specifically developed and field proven for energy storage.

Digitalization: AC Boilers “AC PERFORMANCE PLUS™”, based on IoT solutions, to provide customer assistance through remote monitoring of the steam generators performance from the AC Boilers head office. 


In addition, the company provides its customers with a full range of boiler services, spanning from full rehabilitations and retrofits to spare parts procurement.


AC Boilers HQ is located in Gallarate, near the Malpensa international airport in the North of Italy, where all the engineering and project execution - related activities are performed.  AC Boilers facility located in Gioia del Colle, southern Italy in the province of Bari, is equipped for the manufacturing of pressure parts for utility boilers, WTE/Biomass boilers, HRSGs, as well as for the assembly of HP drums and burners.

AC Boilers relies on its own combustion center (CCA – Centro Combustione Ambiente), located at the facility in Gioia del Colle, assisting in new products and technologies development in the combustion sector, focusing on environmental sustainability and protection.

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Diamond Partner

  • Schneider Electric


Platinum Partner

  • Siemens AG


Gold Partners

  • Baker Hughes
  • Energy Web Foundation
  • Energynest
  • Ericsson
  • Gridspertise
  • Palantir
  • SAP
  • Siemens Energy
  • Solar Turbines
  • Wartsila

Silver Partners

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Knowledge Partner

  • Enel Foundation


Legal & Regulatory Partner

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Utility Partner

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  • Enel Grids
  • RTE



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  • AC Boilers
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  • Cisco
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  • Oracle Energy and Water
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  • ProEnergy Services
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Initiate Partners

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  • TotalEnergies


Industry Partners

  • ANIE Federazione
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  • CHARGE Energy Branding
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  • Eurogas
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  • European Biogas Association
  • European Energy Retailers (EER)
  • Flow Batteries Europe
  • Generazione Distribuita (Distributed Generation)
  • Hydrogen Europe
  • IEC - International Electrotechnical Commission
  • IPPF
  • Lombardy Energy Cleantech Cluster (LE2C)
  • OSGP
  • Ricerca sul Sistema Energetico - RSE SpA
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  • T&D Europe
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