Cascades Geothermal Region

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Cascades Geothermal Region

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The Cascade Range is part of a vast mountain chain that extends from British Columbia to northern California and has been volcanically active for ~ 40 million years as a result of the convergence of the of the Juan de Fuca and Pacific plates. Two physiographic sub-provinces make up the Cascade Range; the Western Cascades and the High Cascades on the east. Middle Eocene to early Pliocene (40 – 5 million years) thick mafic lava flows, primarily of andesitic composition are associated with ash flows, tuffs, and silicic intrusive bodies and stocks that decrease in age eastward to the High Cascades. Miocene to Holocene volcanic rocks make up the modern volcanic arc of the high Cascades. Lava flows, 2- to 3 km thick, fill an a graben developed in older rocks that are intruded and overlain by stratovolcanoes of Quaternary age. Their composition varies from rhyolitic to basaltic associated with interlayered ash flows and pryroclastic deposits. The High Cascades are situated at the western margin of the Basin and Range in the zone of crustal extension. This has had control over the volcanic history and the north-south alignment of volcanic activity (Cashman, K.V. and others, 2009). Assessment of Moderate- and High-Temperature Geothermal Resources of the United States[1]


  1.  "Assessment of Moderate- and High-Temperature Geothermal Resources of the United States"
Geothermal Region Data
State(s) California, Oregon, Washington

Area 124,543 km²124,543,000,000 m²
48,073.598 mi²
1,340,568,397,700 ft²
148,953,428,000 yd²
30,775,198.015 acres
USGS Resource Estimate for this Region
Identified Mean Potential 608 MW608,000 kW
608,000,000 W
608,000,000,000 mW
0.608 GW
6.08e-4 TW
Undiscovered Mean Potential 1057 MW1,057,000 kW
1,057,000,000 W
1,057,000,000,000 mW
1.057 GW
0.00106 TW
Planned Capacity
Planned Capacity 30 MW30,000 kW
30,000,000 W
30,000,000,000 mW
0.03 GW
3.0e-5 TW
Plants Included
in Planned Estimate
Plants with Unknown
Planned Capacity

Energy Generation Facilities within the Cascades Geothermal Region

Geothermal Power Projects within the Cascades Geothermal Region

Geothermal Development Projects in the Region(per GEA's Annual U.S. Geothermal Power Production and Development Report (April 2011))