Clesi’s energy efficiency division – ESE EFFICIENCY – was founded by brothers Luigi, Sergio and Ettore Izzo with many years of experience in the energy efficiency, low environmental impact, civil, social, health and industrial constructions sector.

Thanks to market strategies, investments in research and development and fruitful collaboration with universities, including CESMA (Advanced Metrological and Technological Services Center) of the Federico II University of Naples, ESE ranks among the most dynamic companies in the research and development and results. ESE operates throughout the Italian national territory


Our commitment is to create a value for the customer who is actively involved in every steps we take and with whom we establish an open dialogue in order to reach the best solutions together.


We aim to spread the culture of energy efficiency, of resource saving and of the reduction of greenhouse gas emissions. We want to contribute actively to make the world a better place


Our mission is to develop energy efficiency plans and programs for the public and the private sector with the aim to enhance their energy consumption and improve their competitiveness using the best practices and the best available technologies.

The key to success

The key to success of ESE is the customer care and the multidisciplinary approach, which lead to produce a structured and accurate offer in order to identify losses and the best measures for making power used efficiently and assess consumes.

Areas of specialization

  • Industrial sector
  • Hotel industry
  • Commercial sector
  • Handicraft sector
  • Residential sector
  • Tertiary sector
  • Public entities


  • Electrical efficiency
  • Photovoltaic
  • Software
  • Impedance optimizer
  • Stabilizer