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PILGRIM HOT SPRINGS PRELIMINARY FEASIBILITY ASSESSMENT

PILGRIM HOT SPRINGS PRELIMINARY FEASIBILITY ASSESSMENT. By Michelle Wilber & Lorie M. Dilley PE/CPG Hattenburg Dilley & Linnell For the Alaska Energy Authority. Pilgrim Hot Springs. Located approximately 60 miles north of Nome, Alaska

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PILGRIM HOT SPRINGS PRELIMINARY FEASIBILITY ASSESSMENT

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  1. PILGRIM HOT SPRINGSPRELIMINARY FEASIBILITY ASSESSMENT By Michelle Wilber & Lorie M. Dilley PE/CPG Hattenburg Dilley & Linnell For the Alaska Energy Authority

  2. Pilgrim Hot Springs • Located approximately 60 miles north of Nome, Alaska • Located within Mary’s Igloo Native tribal lands is 2 sq. miles of thawed ground • Nome using approximately 3 MW to 5 MW • What is the feasibility of developing Pilgrim Hot Springs? • What are the order of magnitude costs?

  3. Pilgrim Springs Catholic Church built 1918-1920 and mission grounds The 7.5 mile access road Starts at Marker 53 (Nome – Teller Road)

  4. Geothermal System • 1978-1984 – Studies to confirm resource • 6 wells – 60 to 1000 feet deep • Shallow geothermal system – 90 C • Thermal Gradient – 2.2 C per 100 feet • 90% of the potential 12 to 19 MW is unidentified source • An assumed deeper source – 150 C and about 5,000 feet deep

  5. Alternatives Developed • Alternative 1 – Shallow Source – UTC System : 90 C fluid, 500 ft deep • Alternative 2 – Deep Source – UTC System : 150 C fluid, 5,000 ft deep • Alternative 3 – Deep Source – Binary Plant : 150 C fluid, 5,000 ft deep

  6. Cost Components • Site Development • Exploration, Confirmation, & Permitting • Production Well Drilling • Power Plant and Gathering System • Transmission Line • Costs from outside sources incurred an “Alaskan Factor” of 2

  7. Site Development • Upgrade 7.5 mile road to accommodate drill rigs : 24 ft wide, 3 ft section, culverts for stream crossings : 3 to 5 M$ • Pad Development : 15,000 sq ft building, drill pads : 0.5 to 1 M$

  8. Exploration, Confirmation & Permitting TOTALS: 7-14 M$ 11-22 M$

  9. Production Well Drilling Average Costs of Onshore Oil & Gas Drilling for 2003 from Joint Association Survey on Drilling (Augustin, 2006).

  10. Power Plants & Gathering System UTC System • $1,300 per kW • Currently only 200 kW • Developing 1 MW • Shipping & Building & Alaska Factor • 12 to 17 M$ Binary System • $1,600 to $2,400 per kW • Full Range of Generators • 5 MW Generator • Shipping & Building & Alaska Factor • 23 to 30 M$

  11. Transmission Lines • 60 miles assuming winter construction, topography is gentle • Dryden & LaRue: 0.5 to 0.75 M$ per mile • Hanse suggest 0.2 to 0.45 M$ per mile • Total Cost : 20 to 45 M$

  12. Alternative 1

  13. Alternative 2

  14. Alternative 3

  15. Conclusions

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