Agenda - Council - 11/28/2017 - Laserfiche WebLink

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SOLAR COLLECTION, INVERTERS, AC COLLECTION, AND TRANSFORMERS The PV modules will be electrically connected into a series of strings. A string inverter will be installed for each string located throughout the solar field. The module strings will be wired to string inverters (DC -to -AC conversion equipment) on the SGF site. The inverter output power cables will be combined in five distributed AC panel boards located throughout the SGF. The outputs of the AC panels will be combined at a centrally located AC switchgear station installed on a concrete pad. A step-up transformer will also be located at this central location and the output of the transformer will feed to the utility, Connexus Energy. Underground electrical cables will be installed in PVC (polyvinyl chloride) conduit using ordinary trenching techniques, which includes excavation of trenches to accommodate PVC conduit. The PVC electrical conduits and wires will be installed at varying depths across the SGF. The depths for the PVC conduit and trench backfill will be in accordance with local, state, and federal codes. The AC energy will be stepped up to the appropriate interconnection voltage by the system transformer to match the voltage at the grid interconnection. Required switchgear cabinetry will be provided as necessary for circuit control. The electrical inverters will be H- frame mounted and the AC collection panel, switchgear, and step-up transformers will be placed on poured concrete foundations. SGF INTERCONNECTION DESCRIPTION Each inverter will be outdoor rated and mounted on a steel, rigid frame. The AC output of the inverters will be fed to the distributed AC panel boards. The AC collection system cables will be connected in parallel and collected at the site switchgear. The switchgear includes the main circuit breaker and utility metering equipment. It will be enclosed separately but pad -mounted together with the set-up transformer. GENERATOR -TIE LINE The power generated by the SGF will be connected to the existing Connexus Energy network using the voltage transformation equipment and system safety equipment to be constructed at the SGF. Timeline for Decommissioning Plan As stated above, the proposed SGF will operate for no less than 25 years. After operations cease at the facility, equipment removal will take approximately one month, and reclamation will take an additional two weeks. Removal of Hazardous Materials Based on the use of the site, hazardous materials will not be present in significant quantities and the risk of spill or release is considered low. Once the SGF ceases operations, all potential hazardous materials (i.e., transformer coolant) and wastes (i.e., broken PV panels) will be removed from the site and disposed of in accordance with local, state, and federal laws.