"The Enabling Grids for E-sciencE project brings together scientists and engineers from more than 90 institutions in 32 countries world-wide to provide a seamless Grid infrastructure for e-Science that is available to scientists 24 hours-a-day. Conceived from the start as a four-year project, the second two-year phase started on 1 April 2006, and is funded by the European Commission."
"The EGEE Grid consists of over 20,000 CPU available to users 24 hours a day, 7 days a week, in addition to about 5 Petabytes (5 million Gigabytes) of storage, and maintains 20,000 concurrent jobs on average."
Any CESGA's user that wants to use the current grid infrastructure could request to join the CESGA's VO. For more details check the CESGA's VO main page.