6.1.3 Renewable sources of energy

Wave and tidal energy

Tidal energy converts the energy from tides into electricity.

Tidal power has potential for future electricity generation, since tides are more predictable than e.g. wind and solar power

The world’s first large-scale tidal power plant is the Rance Tidal Power Station in France. The  newer Sihwa Lake Tidal Power Station is bigger. New forms of tidal power plants are being built, and  new technologies continuosly tried out.

Wave energy

Waves can give an endless and strong supply of energy  with the right technology.

Geothermal energy

Geothermal energy exploits the heat in the interior of the Earth for heating buildings and producing electricity. Geothermal energy is environmentally friendly, as it produces no waste. It has become increasingly popular in apartment buildings.


Hydrogen is high in energy, yet an engine that burns pure hydrogen produces almost no pollution. NASA has used liquid hydrogen since the 1970s to propel the space shuttle and other rockets into orbit. Hydrogen fuel cells power the shuttle’s electrical systems, producing a clean byproduct – pure water, which the crew drinks.

A fuel cell combines hydrogen and oxygen to produce electricity, heat, and water. Fuel cells are often compared to batteries. Both convert the energy produced by a chemical reaction into usable electric power. However, the fuel cell will produce electricity as long as fuel (hydrogen) is supplied, never losing its charge.
Renewable energy world. hydrogen

Hydrogen and fuel cell research

National Geographic quizzes:

Quiz: What You Don’t Know About Energy Efficiency
You know that poor insulation makes for a drafty, energy-wasting home, but how much do you really know about the true potential of energy efficiency?

Quiz: What You Don’t Know About Energy in Africa
It’s home to millions of people whose homes lack even a single lamp, but it’s also a frontier of great change and innovation. How much do you know about sub-Saharan Africa’s energy potential?

Quiz: What You Don’t Know About South American Energy
South America has vast energy resources, but how much do you know about the needs and reserves of its individual countries?

Quiz: What You Don’t Know About Energy in Asia
You know that demand in Asia is moving energy markets around the world, but how much do you really know about the needs and resources of the world’s most populous continent?

Read more:

Wave & tidal energy




Home Chapter  5  5 Green economy
Chapter 6 6 Greener future?
6.1 Green technology
6.1.1 Solar
6.1.2 Wind
6.1.3 Renewable energy
6.1.4 Energy storage
6.1.5 Geo-engineering
6.2 Ecological footprint
6.3 Greener law?
6.4 Greener business?
6.5 Greener architecture?
6.6 Greener tourism