http://www.heracomm.com/casa/ca_servizio_tutela/ca_servizio_tutela_gas/ http://www.heracomm.com/casa/ca_servizio_tutela/ca_servizio_tutela_gas/ The sales charge for the economic conditions of the supply for the protected service, defined Arera, is governed by ARG/gas resolution 64/2009 (Uniform Code Governing Retail Sales of Natural Gas).