Our partners
Their trust make us proud
- Our Services
Services
On-site data at the core of everything we do
Satellite images and numerical weather prediction models alone are not enought to ensure the accuracy required in the current context of tightening grid regulations and increasing forecast deviation penalties
NEXT
Forecasting
Intraday and day-ahead forecasts integrating your PV site’s existing data with unmatched accuracy
INSTANT
Nowcasting
Forecast from 1 minute ahead using a network of cameras and sensors installed on the PV plant
FUTURE
Solar Assessment
Solar resource assessment enhanced by one year of on-site measurements to calibrate satellite data
- Our Expertises
Expertises
Few words about expertises
Thanks to a network of sensors (cameras and pyranometers) installed on site, enabling 3D modeling of clouds and quantifying their impact on production, you can accurately anticipate the solar energy injected into the grid.
- Our company
About Calibsun
From generic to site-specific forecasting based on +18 years of photovoltaic expertise
Forecast empowered by on-site data.
CalibSun is a spin-off of Solaïs, a solar engineering consultancy with over 15 years of expertise in the photovoltaic sector, which equips us with invaluable hands-on knowledge about PV financing, development and operations.
At CalibSun, we are a team of passionate, driven, and highly skilled experts dedicated to helping PV players stay ahead of the competition in the fast-evolving world of renewable energy.
- Our markets
For all Solar Players
To limit the financial penalties associated with the discrepancy between forecasted and real power production, photovoltaic power plants need reliable D+1 and intra-day forecasts. By combining meteorological models, high spatial resolution satellite images and existing on-site data, it is possible to obtain a more accurate view of future production.
IPPS & Utilities
Manage of your photovoltaic power plants with intraday and day-ahead forecasts integrating on site data…
Traders & agregators
Access real-time and probabilistic forecasting tools to follow market dynamics and stay competitive…
Off-grid & hybrid industries
Optimizing self-consumption of solar energy for off-grid and behind the meter applications…
PV developers
Accurately estimate the solar resource for your PV projects and optimize your BESS integration…
Storage managers
Optimize your storage sizing, energy dispatch, and debt financing of your PV + BESS projets…
- Our news
From the blog
- Weather & Energy
- 07.07.2026
Numerical weather prediction models (NWP): The 131-million data point engine behind your weather forecast
Need more information ?
Get in touch !
- Questions
Frequently asked questions
Whats is Calibsun ?
CalibSun is a solar technology company that provides high-precision solar irradiance and photovoltaic (PV) power forecasting solutions. It helps energy producers, traders, and grid operators optimize performance, manage grid integration, and improve profitability.
How does CalibSun achieve high forecast accuracy?
CalibSun combines global Numerical Weather Prediction (NWP) models and satellite imagery with real-time, on-site data from solar plant sensors and camera networks. This unique dynamic integration recalibrates forecasts continuously based on hyper-local weather conditions.
How can I contact Calibsun ?
You can reach CalibSun directly through the contact form on their website, by phone (+33 (0)4 83 88 02 92), or by booking a videoconference with their team of experts.
Where is the company ?
CalibSun is headquartered in the South of France (Technopole of Sophia Antipolis) where its team of data scientists and solar meteorology experts is based. While based in Europe, CalibSun operates globally.
