Renewable Energy - Water
has been successfully harnessed in Brittany since 1967. Small
prototypes operate near Bergen in Norway. Electricity is generated
from the rise and fall in water levels as the tide ebbs and
flows. More than 30 good sites for using tidal energy have
been identified around the world.
Hydro-electric Power The
most widely used form of renewable energy is hydro-electric
power; currently producing 25% of the world's electricity.
The amount of water in a dammed lake at the top of a mountain
has the potential to be converted into kinetic (moving) energy
if the dam is breached.
Power (HEP) works as a result of the potential energy water
possesses before it is released - transformed to kinetic energy,
and at the base of the mountain some converts to heat and
sound energy. The remaining kinetic energy drives the turbines
of generators converting this energy into electricity. Electric
energy depends on the movement of electrons inside conductors
and is the principal way in which we transfer energy from
place to place.
There could be a six-fold increase in HEP by the year 2020.
In 1989 the total amount of hydroelectric power generated
was equivalent to 526 million tonnes of oil! In Canada and
Norway it is the main source of electricity, as in developing
countries such as brazil, Ghana and Zambia.
© ep@w Publishing Company Ltd. 2000