ESCONDIDO CANYON PUMPED STORAGE HYDRO

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AFTERBAY RESERVOIR

• Disturbed Area: 216-acres
• Upper-Level Liquid Area: 3,922,575-ft2 (90.1-acres)
• Bottom-Level Liquid Area: 3,726,446-ft2 (85.5-acres)
• Liquid Depth: 95-ft, Freeboard: 5.0-ft (Above Upper Liquid Level)
• Average (50% of Volume) Liquid Depth: 53-ft
• Liquid Storage: 8,449 acre-ft
• Dam Type: RCC-Roller Compacted Concrete, Spillway: To Be Determined
• Annual Evaporation: 375 acre-feet (51-in. per year)
• Rain/Snow Catchment Area: n/a

FOREBAY RESERVOIR

• Disturbed Area: 157-acres
• Top-Level Liquid Area: 3,970,502-ft2 (91.2-acres)
• Bottom-Level Liquid Area: 3,771,977-ft2 (86.6-acres)
• Average (50% of Volume) Liquid Depth: 53-ft
• Liquid Depth: 95-ft, Freeboard: 5.0-ft (Above Upper Liquid Level)
• Liquid Storage: 8,449 acre-ft
• Dam Type: RCC-Roller Compacted Concrete, Spillway: To Be Determined
• Annual Evaporation: 379 acre-feet (51-in. per year)
• Rain/Snow Catchment Area: n/a

RESERVOIR HEAD DATA

• Average Static Head: 3,290-feet
• Maximum Falling Head: 3,195-feet
• Minimum Falling head: 2,137-feet

POWERHOUSE, FLOWS and EQUIPMENT

• Ternary Type PSH with single speed sync Motor/Generators
• No. Powerhouses: 2
• Total No. Turbine/Pump Units: 6 (3-Units per Powerhouse)
• Water Flow per Turbine/Pump Unit: 537,854-gpm, All Turbines: 3,227,122-gpm
• Maximum Power Output: 2-GW
• Maximum Duration (Based on Reservoir): 12-hrs
• Annual Power Generation: 12-hr. Periods: 8,760-GWh, 10-hr. Periods: 7,300-GWh
• Pump Cycle Efficiency: 87.2%
• Turbine Cycle Efficiency: 88.5%
• Round Trip Efficiency (RTE) with losses and Leakage: 77.0%
• Motor/Generator Units: 382-MW

UNDERGROUND EXCAVATIONS

• Access Tunnel Network: 19,430-ft
• Tailrace Discharge Branches: 5,190-ft
• Powerhouse Tailraces, Penstocks, Accesses: 4,520-ft
• Intake Shafts: 3,585’
• Discharge Shafts: 141’
• Secondary Ventilation/Access Shaft: 3,500-ft.

ELECTRICAL and TRANSMISSION

• Generator output underground 23kV, increased to 500kv at an underground substation
• Surface substation will reduce to a 345kV OH line feeding Las Cruces, NM (67-miles) and a 345kV OH line feeding (11m) Artesia - El Paso OH Lines.
• 667MW will be delivered to Las Cruces, and 1,334MW via the Artesia and El Paso line. The PSH unit will have the capacity to deliver 2,000MW once the Las Cruces, or the Artesia - El Paso line is upgraded to 500kV.
• Both high voltage lines will deliver to the connection with a VD of less than 2-percent
• Generators Power Factor: 88.4% Lagging

MISCELLANEOUS

• Required road construction to Forebay: 1.4-miles
• Required new road construction Forebay: 5-miles
• Required road construction to Afterbay: 1.0-miles
• Required new road construction Afterbay: 5-miles
• Water well development: Alluvium adjacent to afterbay site
• Project located on: USFS-Lincoln National Forest, project area 5,209-acres (1/8 section rule, includes roads)
• Makeup water pumping requirements is 565-gpm for 20-hrs/day
• FERC Preliminary Permit awarded Oct 4, 2024.