ists are unhappy with the continued development and spread of nuclear
power, even though some accept that it may be hard to avoid. In part, of
course, they claim that this is the result of policy failures to invest suffi -
ciently in the benign alternatives over the past 30 or 40 years.
It would however be unfair to pretend that renewable energy is the perfect
answer. For a start such renewables as PV, wind, and wave are generally
diffuse and intermittent. Often, they are rather unpredictable. And although
the ‘ fuel ’ is free and the waste products are minimal, up - front investment
costs tend to be large. There are certainly major challenges to be faced and
overcome as we move towards a solar future.
Our story now moves on towards the exciting technology of photovoltaics,
arguably the most elegant and direct way of generating renewable electricity.
But before getting involved in the details of solar cells and systems,
it is necessary to appreciate something of the nature of solar radiation –
the gift of a steady fl ow of energy income that promises salvation for the
planet.
ists are unhappy with the continued development and spread of nuclearpower, even though some accept that it may be hard to avoid. In part, ofcourse, they claim that this is the result of policy failures to invest suffi -ciently in the benign alternatives over the past 30 or 40 years.It would however be unfair to pretend that renewable energy is the perfectanswer. For a start such renewables as PV, wind, and wave are generallydiffuse and intermittent. Often, they are rather unpredictable. And althoughthe ‘ fuel ’ is free and the waste products are minimal, up - front investmentcosts tend to be large. There are certainly major challenges to be faced andovercome as we move towards a solar future.Our story now moves on towards the exciting technology of photovoltaics,arguably the most elegant and direct way of generating renewable electricity.But before getting involved in the details of solar cells and systems,it is necessary to appreciate something of the nature of solar radiation –the gift of a steady fl ow of energy income that promises salvation for theplanet.
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