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Physical Science : Green Energy Costs
Poziom:
Temat: Środowisko
Hi I'm Steve Jones and I'm going to tell you
a little of the costs of green energy. Although
the energy itself is free that is the sunlight
is free we don't have to pay to stand in the
sunlight, these forms of energy do require
infrastructure. If you think of Geothermal
energy, energy from, within the earth this
energy requires large wells digging and those
wells down which we pump water and from which
we get hot water, that is a large amount of
infrastructure. And we have to take that energy
to towns. So we need big pipes, we need lots
of water and so forth. This is the cost of
Geothermal energy, although the energy itself
is free. Biomass is the same. If we want to
produce Biomass we have to grow the plant.
We have to buy the seeds. We have to prepare
the ground. We have to harvest it, we have
to transport it to where it's going to be
processed. And then we have to have a facility
to turn it into energy. So when we talk about
diesel from Biomass it does have a cost. Although
again the sun that makes the plants grow is
free. Hydroelectric power, is very effective.
And we get massive amounts of electricity
but I can't see us building a dam on the cheap.
These are huge construction projects, they
require roads and infrastructure and towns
and hundred of thousands of people to run
them. So hydroelectric power although the
actual energy is free, because it's the sun's
energy moving the water and the water cycle.
The actual cost is the cost of the infrastructure
creating the electricity from the hydroelectric
power. Wind energy is also the same. The infrastructure
is needed. The tall tower, the turbines and
getting the energy to people. So it is free,
the wind we don't pay for but we pay for the
infrastructure. Finally solar energy must
be one of the most expensive of all these
renewable sources because silicone and the
related chemicals and structure are very expensive
to produce. And therefore solar cells probably
every fifteen years you've got to replace
them and it probably takes about fifteen years
to pay the cost of producing them. So overall
solar energy is actually quite an expensive
form of free energy. So although the energy
is free, it comes from the sun. We have to
remember there are costs, getting that energy
from the sun into our houses.
