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Geothermal Projects

IONE, CA

EBMUD PARDEE DAM POWERLINE SAFETY IMPROVEMENTS PROJECT

EETS retrofitted Pardee Powerhouse, originally designed by Arthur Powell Davis, who also completed the concept design for the Hoover Dam. In response to the increased risk of wildfires in California, EETS was tasked with undergrounding overhead infrastructure and implementing additional changes to enhance the power system’s resilience and redundancy. Key project components included:
  • Replacing approximately 1.5 miles of overhead 7.2kV lines with a 12.47kV underground system, which involved replacing and adding transformers, installing 12.47kV sectionalizing cabinets and load interrupter switchgear, and adding fiber cable to establish new communication infrastructure.
  • Conducting field investigations and retrofitting the powerhouse and dam gallery to route circuits and fiber cable from an existing 12.47kV breaker. This also included installing a 2MVA 7.2kV:12.47kV transformer and adding new protective relays and network hardware.
  • Designing 12.47kV switchgear with PACS (Protection Automation Control System) in a new power building, featuring controls for the automatic operation of three (3) separate sources: 7.2kV Pardee Powerhouse, 12.47kV PG&E, and parallel 750kW diesel generators. This system included breakers, ATS, and relays.
  • Incorporating multiple SEL-751 feeder protection and Arc Flash relays into the control systems.
  • Developing a detailed cutover plan to minimize downtime for critical facilities during construction.

RENO, NV

APPLE MILLS SUBSTATION 

With the perpetual growth of Apple, the company initiated a significant data center expansion known as Project Huckleberry. This initiative included the development of a 137-acre solar array capable of generating 43.5 million kilowatt-hours of clean energy and a 22,500-square-foot substation
(Mills Substation) connected via overhead lines to a new Nevada Energy switching station. The existing Mills data center spans over 400,000 square feet and supports services such as iTunes, iCloud, the App Store, and Apple Books. Project Huckleberry will double this capacity with an additional 400,000 square feet.
As part of this design-build project, EETS engineers contributed to the design of a 100 MVA 120kV:12kV substation. Key deliverables included:
  • Conducting electrical design calculations and developing equipment procurement technical specifications, which encompassed one-line and relaying drawings as well as point-to-point interconnection drawings for station equipment.
  • Designing and analyzing ground grid layouts, including calculations and detailed plan layouts.
  • Preparing protection settings, one-line diagrams, relaying designs, and protection/control panel layouts.
  • Coordinating with the utility and performing short-circuit, coordination, and arc flash calculations.
  • Providing engineering technical support throughout the construction phase.
  • Analyzing submittal data and performing DC load calculations for operational and tripping scenarios, determining the required DC battery system and charger sizes, completing CT saturation calculations for a 12kV feeder circuit, conducting underground duct bank cable thermal ampacity analysis using the Neher-McGrath Method, and designing substation yard lighting with photometric analysis.
  • Designing transmission lines from the Nevada Energy substation to the Mills substation. EETS prepared the plan and profile drawings, performed calculations, and created stringing charts.  

IONE, CA

EBMUD PARDEE RELAY RETROFIT FOR HYDRO GENERATION

The Pardee Facility, operated by the East Bay Municipal Utility District (EBMUD), is a critical water treatment and storage site located in the Sierra Nevada foothills. It encompasses the Pardee Dam and Reservoir, key components of the Mokelumne River water system, which supplies high-quality
drinking water to over 1.4 million customers in the San Francisco East Bay region. In addition to supporting hydroelectric power generation and water storage and distribution, the facility plays a vital role in environmental stewardship and recreational resource management.
To ensure the continued reliable operation of the Pardee Powerhouse, EETS was tasked with upgrading failing and outdated power infrastructure. This project included the installation of SEL-751A relays for enhanced protection and control at the following facilities:
  • Pardee Powerhouse Unit #1: Breaker Protection & Station Service Relay Upgrade
  • Pardee Powerhouse Unit #1 and #2: Station Service Relay Upgrade for Breaker #4
  • Pardee Powerhouse Unit #1 and #2: Station Service Relay Upgrade for Breaker #6
  • Pardee Powerhouse Unit #1 and #2: Station Service Relay Upgrade for Breaker #7

CLEMENTS, CALIFORNIA

CAMANCHE RELAY RETROFIT FOR HYDRO GENERATION

The Camanche Facility, managed by the East Bay Municipal Utility District (EBMUD), includes the Camanche Dam and Reservoir, located downstream of Pardee Reservoir on the Mokelumne River. Constructed for flood control, water supply, and hydroelectric power generation, the facility plays a critical role in regulating water flows and ensuring reliable
water delivery to EBMUD customers in the East Bay. Additionally, the reservoir supports recreational activities, fishery management, and environmental conservation efforts, making it a multipurpose resource for the region.
To maintain the reliable operation of the Camanche Powerhouse, EETS was tasked with upgrading failing and outdated power infrastructure. This project included:
  • Camanche Powerhouse Switchgear Replacement Preliminary Design Analysis, which incorporated:
  • 4160V switchgear circuit breaker retrofit and modernization
  • Stator ground protection relay SEL-2664S
  • Field ground module SEL-2664
  • Generator protection relay SEL-700G
  • IRIG-B distribution module SEL-3400
  • Managed Ethernet switch SEL-2730M
  • Current transformers

TURLOCK, CA

TID DPRA ELECTRICAL DISTRIBUTION SYSTEM ALTERNATIVES ANALYSIS

EETS provided an alternative analysis for the replacement of medium voltage systems at three (3) campgrounds managed by the Don Pedro Recreation Agency (DPRA) for Turlock Irrigation District (TID). The analysis evaluated power system changes and their associated costs for accommodating increased and new loads, both for present
needs and projections ten (10) years into the future. The three (3) campgrounds included:
  • Blue Oaks Campground: Served at 12,470 volts, 3Ø, by Modesto Irrigation District (MID)
  • Fleming Meadows Campground: Served at 12,470 volts, 3Ø, by Turlock Irrigation District (TID)
  • Moccasin Point Campground: Served at 17,000 volts, 1Ø, by Pacific Gas and Electric (PG&E)
Field investigations were conducted by EETS at all three campgrounds to determine equipment ratings and circuit paths, as no as-built drawings were available. The location of new power loads was also determined. The scope of work included:
  • Generating existing and proposed one-line diagrams and site plans.
  • Coordinating with utilities to accommodate upsized electrical service and transitioning from single-phase to three-phase power where applicable.
  • Developing cost estimates for new loads and upgraded power infrastructure.
  • Identifying shortcomings, safety concerns, and code violations within the existing power systems.

SACRAMENTO, CA

SMUD E-FUEL EV CHARGING

SMUD is leading California’s transition to clean energy by expanding electric vehicle (EV) infrastructure to meet the state’s 2045 carbon neutrality goals. Focused on the installation of Level 2 and Level 3 chargers, SMUD provides rebates for residential, commercial, and multifamily properties, prioritizing equity and accessibility. By leveraging federal and state grants, SMUD deploys public chargers in
underserved areas, fostering widespread EV adoption. These initiatives align with California’s clean transportation mandates by integrating renewable energy and reducing greenhouse gas emissions.
For numerous multi-housing units across Sacramento, EETS provided the following services:
  • EETS Conducted field investigations to determine the most cost-effective methods for feeding new Level 2 and Level 3 EV chargers from the existing power infrastructure, incorporating load-sharing hardware.
  • Coordinating witCoordinated with vendors and stakeholders for the installation of EV chargers and the associated new or upgraded power infrastructure.h utilities to accommodate upsized electrical service and transitioning from single-phase to three-phase power where applicable.
  • Produced construction drawings, including one-line diagrams, equipment elevations, site plans, schematics, and communication diagrams.

Generation Projects

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