Energy generated from offshore resources is not reliable over short periods of time. Although<br>wind and wave energy is fairly consistent in the long run, their short term capacity fluctuations<br>prohibit these resources from replacing dependable fossil-fuel based energy systems. This<br>limitation could be overcome if the energy harvested from these resources could be stored<br>temporarily and then released when needed.<br>The large hydrostatic head at the ocean floor provides a unique opportunity for storing energy<br>offshore. Similar to hydroelectric dams storing water at a high potential, energy could be stored<br>offshore by displacing water from a subsea chamber. This chamber could be incorporated into<br>the mooring system of present offshore harvesting devices to yield more favorable economics.<br>This report establishes the baseline assumptions for designing this energy storage device and<br>proposes a methodology for constructing a beta level prototype. In addition to discerning the<br>tradeoffs between different design options with respect to the marine environment, this study<br>analyzes the cost of this structure per unit energy stored.<br>The contents of this report comprise of the following. First, the hazards inherent to the marine<br>environment are explored qualitatively, and methods to address these issues are proposed.<br>Second, the chamber shape, mooring type, and amount of material are determined based on their<br>respective costs. Finally, this report concludes with the final dimensions of a proposed beta<br>prototype and a list of recommendations for future work ...
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