Heber Geothermal Company, LLC (Ormat Nevada, Inc.) proposes to expand the Heber 1 geothermal facility (HGC) located at 895 Pitzer Road, Heber, California, by taking the existing dual-flash steam turbine generator out of service and installing two (2) new Ormat Energy Converter geothermal power generation units as well as storage tanks and an evacuation skid/vapor recovery maintenance unit.
As per the IID and the generator’s generation interconnection agreement and the Heber 1/HGC facility final facility study, to accommodate the expansion project, IID will be upgrading the existing 92kV protection equipment for the “P” transmission line at the Perry Substation with dual microprocessor-based SEL relays. The new relays will be two current differential and high-speed distance protection schemes (SEL-411L and SEL-311L), and two SEL-751A relays for breaker failure function with direct transfer trip, and permissive overreach transfer trip function.
In addition to the line protection relay upgrades the existing revenue meters at the Heber 1/HGC Substation’s control room are obsolete and will be replaced with SEL-735 metering units.
To conclude with the upgrades IID has deemed Heber 1/HGC facility necessary to participate in the Phasor Measurement Unit (PMU) project. As part of IID Energy’s PMU project communication from substation operational technology environment is required to be routed to the corporate network for capturing of relay data. For this implementation, IT is required to install a network firewall to protect operational technology (OT) environment from cyber intrusion. The network firewall will be installed at each site and will require labor to install, configure and test security settings of the network firewall and will also have to commission a telecommunication circuit via IID’s internal telecommunication network.
In summary; IID will install four relays inside IID Perry Substation’s control room and two revenue meters and one Phasor Measurement Unit inside the Heber 1/HGC Substation’s control room.