Suitability of Guam from an Environmental Aspect as a Potential Site for Ocean Thermal Energy Conversion Plants

The bottom drops off rapidly around Guam and depths suitable for ocean thermal energy systems are obtained reasonably close to shore, which increases the possibility that cold water discharge would have an environmental effect. Discharge of cold water into the open sea could have two results: Cool water could drift away at or near the surface, simulating natural upwelling with the same beneficial effects; or it could plunge to an intermediate depth with minimal environmental effects. Discharge of cool water, on the other hand, into near-shore environments would probably kill or injure many benthic forms and coral reefs. Prevailing currents in this area are from east to west; therefore, siting on the west side of the island would appear to be preferable. First, cold water would be carried out to sea rather than into shallow water near shore. Secondly, greater depths are available closer to shore on the western as opposed to the eastern side of the island. Most of the places which have been identified as potential fishing grounds are on the north or south of the island, so situated that discharges from eastern but not western plant sites could affect them. (Author)