- Calibsun | About us
About Calibsun
CalibSun is a spin-off of Solaïs, a solar engineering company founded in 2008. Our PV field expertise, combined with cutting-edge research with a leading contributor to the International Energy Agency, makes us excel at integrating and valorizing on-site data in our services.
Calibsun’s history
From PV engineering to forecasting
CalibSun was created in 2023 by Sébastien Pitaval and Nicolas Thévenin, the founders of Solaïs, a solar engineering consultancy established in 2008. The company was built on a clear conviction: satellite models and numerical weather prediction models alone are not sufficient to produce the accurate, reliable forecasts that today’s energy market demands. Local, on-site data must be at the core of every forecast.
Their ambition was to bring operational-grade irradiance and PV production forecasting tools to energy industry professionals worldwide, grounded in both field experience and scientific rigor.
CalibSun is the result of 12 years of collaborative research with the O.I.E. (Observation, Impacts, Energy) laboratory at Mines Paris – PSL, one of France’s leading engineering schools, and is a founding member of the SciDoSol Research Chair.
Our vision and mission
- 2026 numbers
Built on Science. Proven in the Field.
Tested by multiple players across diverse climates and geographies, CalibSun consistently ranks first in intraday solar forecasting accuracy.
- 2026 numbers
Built on Science. Proven in the Field.
Tested by multiple players across diverse climates and geographies, CalibSun consistently ranks first in intraday solar forecasting accuracy.
Our leadership team
CalibSun brings together experts in solar energy, meteorology, data science, and artificial intelligence.
Nicolas Thévenin
CEO / Co-founder
Nicolas Thévenin has co-founded Solaïs in 2008 and its subsidiary CalibSun in 2023. Entrepreneur, marketing, and strategy expert, he has over 20 years of experience in renewable energy, telecommunications, and digital technology sectors.
Expert in developing photovoltaic project portfolios, he has led the development, acquisition, and operation of photovoltaic assets in Europe and Asia.
Sébastien Pitaval
Co-founder
Sébastien Pitaval, has started his career in the space industry and co-founded Solaïs in 2008 and its subsidiary CalibSun in 2023. His interest in renewable energies, convictions, and entrepreneurial spirit led him to the photovoltaic sector.
He develops R&D and engineering activities while implementing Corporate Social Responsibility (CSR) since 2012 within the company. He is also an expert witness at the Aix-En-Provence Court of Appeal.
Nicolas Thévenin
CEO / Co-founder
Nicolas Thévenin has co-founded Solaïs in 2008 and its subsidiary CalibSun in 2023. Entrepreneur, marketing, and strategy expert, he has over 20 years of experience in renewable energy, telecommunications, and digital technology sectors.
Expert in developing photovoltaic project portfolios, he has led the development, acquisition, and operation of photovoltaic assets in Europe and Asia.
Sébastien Pitaval
Co-founder
Sébastien Pitaval, has started his career in the space industry and co-founded Solaïs in 2008 and its subsidiary CalibSun in 2023. His interest in renewable energies, convictions, and entrepreneurial spirit led him to the photovoltaic sector.
He develops R&D and engineering activities while implementing Corporate Social Responsibility (CSR) since 2012 within the company. He is also an expert witness at the Aix-En-Provence Court of Appeal.
Desiring an exciting career in energy?
Join a team of experts to design tools dedicated to actors in the solar energy market.
The CalibSun team brings together experts in solar energy, meteorology, data science, and artificial intelligence who have leveraged meteorological data and satellite image processing to serve energy transition.
Our resources
Solar & data expertise
CalibSun is a spin-off of Solaïs, a company that has been an expert in photovoltaics for more since 2008 and a leader in solar resource science.
