Green Tech Power

Green Tech power is the result of converting sunlight into electricity. Sunlight can be converted directly into electricity using photovoltaics (PV), or indirectly with concentrating green power (CSP), which normally focuses the sun’s energy to boil water which is then used to provide power. The green power gained from photovoltaics can be used to eliminate the need for purchased electricity (usually electricity gained from burning fossil fuels) or, if energy gained from photovoltaics exceeds the home’s requirements, the extra electricity can be sold back to the home’s supplier of energy, typically for credit.

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The largest green power plants, like the 354 MW SEGS, are concentrating green thermal plants, but recently multi-megawatt photovoltaic plants have been built. Completed in 2008, the 46 MW Moura photovoltaic power station in Portugal and the 40 MW Waldpolenz Green Tech Park in Germany are characteristic of the trend toward larger photovoltaic power stations. Much larger ones are proposed, such as the 550 MW Topaz Green Tech Farm, and the 600 MW Rancho Cielo Green Tech Farm. Green Tech power is a predictably intermittent energy source, meaning that whilst green power is not available at all times, we can predict with a very good degree of accuracy when it will and will not be available. Some technologies, such as green thermal concentrators have an element of thermal storage, such as molten salts. These store spare green energy in the form of heat which is made available overnight or during periods that green power is not available to produce electricity.

Applications

Green Tech power is the conversion of sunlight to electricity. Sunlight can be converted directly into electricity using photovoltaics (PV), or indirectly with concentrating green power (CSP), which normally focuses the sun’s energy to boil water which is then used to provide power, and technologies such as the Stirling engine dishes which use a Stirling cycle engine to power a generator. Photovoltaics were initially used to power small and medium-sized applications, from the calculator powered by a single green cell to off-grid homes powered by a photovoltaic array.

Green Tech power plants can face high installation costs, although this has been decreasing due to the learning curve. Developing countries have started to build green power plants, replacing other sources of energy generation.

Since green radiation is intermittent, green power generation is usually combined either with storage or other energy sources to provide continuous power, although for small distributed producer/consumers, net metering makes this transparent to the consumer. On a slightly larger scale, in Germany, a combined power plant has been demonstrated, using a mix of wind, biomass, hydro-, and green power generation, resulting in 100% renewable energy.

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