The author’s purpose in Solar-Powered Public Buildings is effective, because the author reveals the significant costs of readying California’s public buildings to run on solar power.
We define solar power as the process of turning solar energy directly into electricity through photovoltaics (PV), indirectly through concentrated solar power, or a mix of both.
Photovoltaic cells use the photovoltaic effect to turn light into an electric current.
A vast area of sunlight is focused to a hot spot by concentrated solar power systems using lenses or mirrors and solar tracking devices, frequently to power a steam turbine.
Cost is the worth of money that has been expended to produce something or provide a service and is therefore no longer accessible for use, to put it simply.
In business terminology, a cost may be an acquisition cost, in which case the cost is the sum of the money spent to obtain it.
Hence, option C is correct.
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