Economic Perspectives of Renewable Energy Systems

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Economic Perspectives of Renewable Energy Systems ( economic-perspectives-renewable-energy-systems )

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However, much more renewable energy generating capacity must be built than that needed for this target before it makes sense to use wind or PV for electrolysis, for instance, or to gasify biomass to hydrogen. Given this situation, hydrogen will not be a prerequisite for de-carbonising the current energy system. The global potential for solar hydrogen production is estimated to about 30 EJ/year (IEA –Solar Paces Implementing Agreement). 8.11 Concepts for Ocean Energy Systems Around 71% of the Earth’s land mass is covered by sea and oceans, and the potential opportunities to harvest the abundant renewable energy sources that these contain is vast, estimated between 1 – 10 TW globally. Ocean energy includes potential and kinetic energy from the ocean. At present only tidal power systems are commercially operated. Several other types of ocean energy sources with different origins exist and the sources are classed into wave, marine current, thermal gradient and salinity gradient. The energy from ocean waves can be considered to be a concentrated form of solar energy. Winds are generated by the differential heating of the earth, and, as a result of their blowing over large areas of water; part of their energy is converted into waves. Many wave energy devices have been proposed but few have reached demonstration. Prototypes of onshore, near shore and offshore Oscillating Water Column systems deployed since 1985 have proven this technology, which is still being developed. Various offshore wave energy devices are reaching the prototype stage as well as devices to exploit the energy resource that marine currents contain. Different 34

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