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Cascade Energy Storage, LLC Battery Storage Project 1.5.1 Project Overview and Design The proposed project would include the development of energy battery storage facilities and associated infrastructure. The proposed BESS would be housed in containers. Power captured by the proposed project would be transferred to the PG&E infrastructure located adjacent to the site on the west. The battery selection will be thoroughly screened and only the highest quality manufactures are being considered. The selection process addresses the purity of the battery cells, which is an important factor in the failure and thermal problems associated with Lithium Ion batteries. The proposed project consists of a 25 megawatt/ 100 megawatt-hour BESS facility. The project would be composed of lithium energy batteries installed in racks, inverters, switchgear, and other associated equipment to interconnect into the 60 kV PG&E tap facility located on the PUCS site. The project would include the following components, which are described in more detail below: • Energy Storage Facility: Installation of an energy storage facility and appurtenances that would provide energy storage capacity for the electric grid. • Power Inverters and Transformers: Power inverters to convert between AC and DC would be located outside the battery building along with transformers that would step up the voltage. • Telecommunication Facilities: Telecommunication equipment, including underground and overhead fiber optics, and meteorological data collection systems or supervisory control and data acquisition (SCADA) • Site Access and Security: On-site access driveways and perimeter security fencing and nighttime directional lighting The battery storage facility is intended to operate year round, and would be available to receive or deliver energy 24 hours a day, 365 days a year. Battery Containers The lithium ion batteries would be housed in battery containers. The containers that would be similar to a shipping container and within the container racks similar to common computer server racks would store batteries (see Attachment A).The racks are typically made of aluminum, and sometimes may be comprised of steel, but never made of any special alloys.The lithium-ion technology is considered one of the most- safe, easily understood, and efficient methods of energy storage on the market.The proposed facility would utilize a lithium-ion technology that has a long lifespan and boasts superior safety and stability characteristics, albeit with a potentially a lower capacity and a larger physical footprint.As mentioned the racks are similar to computer racks and are generally made of aluminum. In some special areas, they may be made of steel. Inverters and Switchgear The project would include inverters, switchgear and PG&E switchgear to receive and deliver power to the local PG&E grid. It is anticipated that Parker Hannifin Bi-Directional inverters (24 total), or equivalent would Page 6