The Sistema Interconectado del Norte Grande (Spanish for Interconnected System of Norte Grande) or SING is an alternating current power grid serving the Norte Grande zone of Chile, it produces 19% of the national power generation. The SING covers the three northernmost regions of Chile including Arica y Parinacota, Tarapacá and Antofagasta Region.
As of December, 2011, it has a total installed capacity of 4,550 MW (gross)