Solar energy is becoming increasingly popular as the world begins to take notice of the burgeoning carbon emission problems that come with burning fossil fuels. More than 100 countries use solar PV with over 100,000,000,000 watts installed. Driven by advances in technology the cost of photovoltaics has declined by over 70% since 2008. With current technology, photovoltaics recoup the energy needed to manufacture them in 1 to 4 years. The immediate and long term benefits of solar are significant.
Wind energy is one of the fastest growing major sources of new electricity around the world. In 2012, global wind energy capacity grew by 19 per cent, with the wind industry installing a record level of 44,711,000 watts of new clean, reliable wind power. Today, there are over 150,000 wind turbines operating around the world in over 90 countries. Wind energy is universally recognized as one of the safest and most environmentally friendly sources of electricity available to us today.
Hydro comes from the Greek word for water. Hydropower is a renewable power source because it relies on the water cycle, which is driven by the sun. It is the most reliable source of energy because it has a steady supply of power - the energy of moving water. Hydroelectric power stations can be set up in almost any size, depending upon the river or stream used to operate them; big enough to power a single home, a small town, or a large city. Hydropower is one of the greenest of green technologies.