BESS EPC & Midwest Investor-Owned Utility
A Midwest Investor-Owned Utility (IOU) was interested in implementing a battery energy storage plus solar PV system to benefit their service territory. In particular, the end of the line user will benefit from this project. The system consists of 5 MWH battery energy storage system (BESS) and 2.014 MVA Solar PV system. Commonwealth teamed with a BESS EPC as the engineering service provider (ESP) for the BESS plus Solar project. Commonwealth provided the construction documents for the BESS as part of an EPC contract. The necessary project documentation provided by Commonwealth included drawings, specifications, and requested studies to build the BESS plus Solar system.
Commonwealth supported the BESS EPC in providing initial site preparation documentation and layout details. Due to the area impacted by the BESS and Solar, the project required a SWPPP permit. Commonwealth worked with county officials and the Midwest IOU in order to support the permit application. Civil and structural materials and drawings were provided by Commonwealth for construction of the project. Major equipment locations and layouts were provided for installation and site coordination. Erosion control plan, lightning protection study, analysis of Arc Flash hazards, calculating incident energy, and calculations indicating load flow and short circuit at different buses in the power system were performed and provided by Commonwealth. In addition, an insulation coordination study was performed to identify overvoltages and provide overvoltage protection devices as well as appropriate insulation levels.
The identification of safety hazards, suggested mitigation measures, and responses related to the BESS were created by Commonwealth. Relay settings documentation including fault current analysis and coordination study of the ESS and PV was performed by Commonwealth. A grounding grid, ground grid engineering analysis, grounding grid conductor types, connection and test points types and details, ground rod locations, and other grounding related tasks were performed by Commonwealth for construction. Commonwealth also provided the site network communication diagram and lighting study for identify lighting levels throughout the BESS.