REDWOOD CITY, Calif. & SÃO PAULO--(BUSINESS WIRE)--Silver Spring Networks (NYSE:SSNI) and CPFL Energia, Brazil’s largest private electricity group, today announced an extension of their smart grid program, with the addition of a grid reliability and Distribution Automation program for cities in the interior of the state of São Paulo. The expansion of CPFL’s smart grid program leverages the existing investment in Silver Spring’s mesh networking platform and is built upon the successful Phase 1 A