Predefined regions allow to cover areas with the highest density of operating wind farms across the world. Predefined regions for onshore wind farms (areas delimited by circles on the maps) correspond to areas of varying sizes within which the wind regime is consistent over time (i.e. similar wind speed variation). Predefined regions for offshore wind farms (dedicated pictogram) correspond to restricted areas located all around European shores, where a significant offshore wind power capacity is operating.

Consult the list of predefined regions or locate your wind farm on the dedicated map. The price list for indexes on predefined regions is detailed here.

If your wind farm not located in a predefined region, customized indexes can be generated on demand.

Description	Example	Applications	Release	Quick links
Actual cumulated energy index of the period lasting from January to date, compared to the same period over the long-term reference	Cumul irec Jan to Apr 2021 = 95 % means that the production expected from January 2021 to April 2021 should be 5% lower than the production expected on this period (January to April) on an average year.	Production monitoring year-to-date Annual balance sheet	Values updated each month on the website, starting in April (January to March cumulated index)	Start searching

Description	Example	Applications	Deliverables	Quick links
Actual energy contribution of a specific month compared to the average long-term year	Index April 2021 = 8.5 % means that the production expected for April 2021 corresponds to 8.5 % of an average year. Ratio April 2021 = 112 % means that the production expected for April 2021 is 12% higher than the production expected on average for the month of April.	Production monitoring month by month Monthly reporting Correlation with production data (estimation of operational P50 – more than 1 year of data recommended)	Monthly delivery (expected before the 15th of the following month, from January to December) Past months of the current civil year delivered between 2-7 days after payment reception Delivery format: pdf and csv files sent by email	Sample Request a quote

Description	Example	Applications	Deliverables	Quick links
Annual energy indexes of the past 10 or 15 years, long term wind rose and energy rose as well as extreme annual values experienced (min and max 12-month periods)	Index Year 2021 = 95 % means that the production expected for year 2021 is 5% lower than the production expected on an average year. Extreme annual indexes are also provided in order to assess the possible range of production variation due to the wind resource within the region (minimum and maximum 12-month cycles as well as 1st and 9th deciles).	Annual balance sheet 1^st estimate of long-term production capacity (operational P50) Risk analysis (extreme years)	One-time delivery expected between 2-7 days after payment reception Delivery format: pdf and csv files sent by email	Sample Request a quote

Description	Example	Applications	Deliverables	Quick links
Full data base of monthly energy indexes over the past 10 or 15 years	Index January 2021 = 11.8 % means that the production expected for January 2021 corresponds to 11.8 % of an average year. LT Monthly contribution January = 11.1 % means that on average the production expected for the month of January corresponds to 11.1 % of an average year. N.B.: Ratio January 2021 = Index January 2021/LT Monthly contribution January = 11.8%/11.1% = 106%, i.e. the production expected for January 2021 is 6% higher than the production expected on average for January.	Correlation with production data and detailed estimation of the long-term production capacity (operational P50) and retrospective analysis of production capacity on the past year Risk analysis (statistics of the resource for each month)	One-time delivery between 2-7 days after payment reception Delivery format: pdf and csv files sent by email	Sample Request a quote

Average year: Synthetic year representative of the long-term period considered as the reference