Royal Decree1578/2008 [98], enacted on September 26, defines
a new economic regime for photovoltaic installations and creates a
pre-payment register for this technology (PREFO) that affects
facilities permanently enrolling in the administrative record of
special regime production facilities (RIPRE) from September 2008.
This new framework is based on a system of increasing quotas and
declining tariffs and is described in more detail in paragraph 4.9.1.