ERSE S.p.A. (ENEA - Ricerca sul Sistema Elettrico) is publicly-controlled Company: ENEA, the "Italian National Agency for New Technologies, Energy and the Environment"​, holds 51% of its shares and GSE (Gestore Servizi Elettrici) holds the remaining 49% The mission of ERSE is to develop research projects of general interest to the national electricity system, focusing on applied research and with a system-oriented approach. The activity is aimed at innovating and improving the performance of the system from the point of view of economics, safety and environmental compatibility. Other major purposes are a wide activity of dissemination of the results, and the in-depth discussion of electro-energetic and environmental issues. Notes: untill april 2009 the name of the Company was CESI RICERCA S.p.A.On april 29th the Company's name changed into "ENEA - Ricerca sul Sistema Elettrico S.p.A."​ (in brief ERSE S.p.A.). On july 15th GSE (Gestore Servizi Elettrici) acquired from CESI S.p.A. 49% of the shares of ERSE S.p.A. GSE is a publicly-owned company promoting and supporting renewable energy sources in Italy