RTE now provides key figures about electricity demand, power generation and installed base of wind and solar power generation.
They are available at national and regional level. You can browse indicators such as "maximum regional demand" or " average coverage rate of demand regarding wind generation" and many others .
These data are provided not only for the current and previous year but you will also find the historic highs (since 1 January 2012 for the national data, and since 1 January 2013 for regional data).
Note: Data on the production installed base is updated twice a year (at the beginning of the year and around mid-year with other RTE publications).