Alternative & Solar Energy Solutions

Sustainable energy is perhaps best described as "the provision of energy such that it meets the needs of the present without compromising the ability of future generations to meet their needs".

Those who advocate a broader interpretation may allow inclusion of fossil fuels as transitional sources while technology develops, as long as new sources are developed for future generations to use.

However, the 'greener' lobby more often use a narrower interpretation that includes only energy sources which are not expected to be depleted in a time frame relevant to the human race.

Sustainable energy sources are most often regarded as including all renewable sources, such as plant matter, Solar Power, wind power, Geothermal Power, tidal and wave power. It usually also includes technologies that improve energy efficiency.

Conventional nuclear fission power is sometimes referred to as sustainable, but this is controversial due to concerns about radioactivity, waste and the risks of disaster due to accident or terrorism.

Renewable energy technologies are essential contributors to sustainable energy as they generally contribute to world energy security, reducing dependence on fossil fuel resources, and providing opportunities for mitigating greenhouse gases.

The IEA (International Energy Agency) states that:

Conceptually, one can define three generations of renewable technologies, reaching back more than 100 years .

First-generation technologies emerged from the industrial revolution at the end of the 19th century and include hydro-power, Biomass combustion, and geothermal power and heat. Some of these technologies are still in widespread use.

Second-generation technologies include solar heating and cooling, wind power, modern forms of bio-energy, and solar photo-voltaics. These are now gaining popularity as a result of research and development  since the 1980s.

The initial investment was prompted by energy security concerns linked to the oil crises of the 1970s but the continuing appeal of these renewables is due mainly to environmental benefits. Many of the technologies have led to significant advancements in materials available for use in other areas as well.

Third-generation technologies are still under development and include advanced biomass gasification, biorefinery technologies, concentrating solar thermal power, hot dry rock Geothermal Energy, and ocean energy. Advances in nanotechnology may also play a major role.

Green Energy is the term used to describe sources of energy that are considered to be environmentally friendly and non-polluting, such as geothermal, wind, solar, and hydro.

Sometimes nuclear power is also considered a green energy source. Green energy sources are usually given the "green" tag because they are perceived to lower carbon emissions and create less pollution.

Green energy is commonly thought of in the context of Electricity Generation. Consumers, businesses, and organizations may purchase green energy to support further development, help reduce the environmental impacts of conventional electricity generation, and increase their nation’s energy independence.

Renewable energy certificates (green certificates or green tags) have been one way for consumers and businesses to support green energy.