Abstract
A solar tower power plant comprises a tall tower supporting a heat receiver surrounded by a field of heliostats that focus the rays of the Sun onto the receiver. The heliostats are each fitted with a solar tracking system so that they can track the Sun across the sky. Sometimes called point focusing solar concentrators, these plants can achieve concentration ratios of up to 1000. Solar towers often integrate thermal storage using molten salts, usually nitrates, as the heat transfer fluid, which enables them to generate electricity around the clock. Others use direct steam systems. More complex pressurized gas systems have also been proposed that use a gas turbine in a hybrid generating system.
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