Geo has huge potential, using free input of heat from below the earth's surface. The cost of producing electricity varies from US$0.05 to 0.08 per kWH. The USA is currently the largest producer (9 Gigawatts) but comprises less than 1% of total.
Companies involve in this sector:
1. Calpine Corp (CPNLQ.US)
2. Ormat Tech (ORA.US)
3. Enel SpA (EN.US)
4. US Geothermal (UGTH.US)
5. Polaris Geothermal (GEO.CN)
6. Nevada Geothermal (NGLPF.US)
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