In a nutshell, ‘Green Energy’ utilises natural resources such as sunlight, wind, tides and geothermal heat to provide our daily energy requirement. They are considered ‘Green’ because they are environmentally friendly. It is easy to think that we may be travelling back in time when we think of items such as wind power and windmills. However, it is the result of eco-efficient and planet friendly options that this process is maintained.

It is the use of simple renewable energies such as Solar Thermal and Solar Water Heating Collectors, that suits the home environment. It is equipment such as Photovoltaic Panels (PV’s) that develop electricity through suitable roof-panels. Biomass Energy is the next phase, and this involves Fuel, Pellets, Stoves and Boilers burning Wood. Of course, then there is the heating from the Sun – often just called Ground Source Heat Pumps. When we think about Wind Power and Hydropower we have two of the more common forms of energy generation.

Thermal Solar Energy – Typically referred to as Solar Energy this is mainly made up of two types of Solar Panels – each using different methods to achieve similar results. To begin with, we have the concept of drawing energy from the Sun to heat water – known as Solar Water Heating Collectors. Secondly, Photovoltaic heat collectors – often simply referred to as Solar Electrical Panels – which transform the solar radiation into electricity. Obviously situated away from blockages such as chimneys etc., these Solar Panels need to be mounted on south facing roofs at an angle of 30 degrees from the horizontal.

As a result, Solar Water Power is often considered the most common form of Solar Energy in the UK. Solar Water heating systems are extremely important – and can provide over half of the hot water needs for houses within the UK. The cost of fitting depends on whether you do it yourself (500 to 1500 pounds) or whether you get a professional fitter – in which case it will cost between 2-5k overall.

Biomass Energy: This term encompasses all forms of natural products – such as plant and animal material. Considering its ability to produce energy in the form of heat and electricity, this type of energy is extremely flexible. Furthermore, within the European Markets, the UK is one of the central producers of Biomass fuels. One of the main factors of this style of energy is the result without the impact on C02. To that end, many wood crops come from sustainable sources (as one tree is felled, another is planted in its place; thus the new tree absorbs the CO2 produced during the heating process.)

‘Energy Crops’ trees such as Willow and Poplar play a major part in the process – under the banner of Short Rotation Coppice (SRC). Perennial grasses also produce a high yield of dry matter. Within this process also sits the lesser known Agricultural and Municipal Wastes. Agricultural Waste is commonly formed as a by-product of traditional agricultural work. Another biomass source is that of municipal waste – and this comes from recycled wood or food.

Geo-Thermal Energy Systems… This is primarily the heating of the Earth (mainly from the sun) and can be utilised in electricity and warm water production. Heating or cooling properties in the UK can be achieved using the ground source heat temperature of around 12 degrees centigrade. Whilst these heat pumps require energy to operate, their rate of return is excellent – being four units produced for every one unit used. Heat source pump energy can go one step further (by gaining a 100 percent return) if the energy to power them comes from items such as wind turbines or solar electrical panels.

Wind Energy Programs: In use for milling grain or pumping water, wind energy has been with us for a very long time, although its modern uses are complex. However, in more recent times there’s been the option to recover the energy for its own sake – and deliver this either to a home unit or to the local power grid. The UK is considered as one of the best sources of wind generation within Europe. Potentially, we can produce 10 percent of our annual energy needs through wind power, although at present within the UK we still only use 1 percent. Frankly, electricity can be realised from as little as 2p per kWh – as opposed to the current level of 2-10 p per kWh. Recovery of the cost involved is somewhere between 6-9 months.

Then there is Hydropower – something within Europe that the UK excels in. Although new in its approach, the act of harnessing energy from water has been going on for a long time. In total, this could produce something like 2 percent of all electricity required in the UK.

Using a turbine, a Hydropower system can transform the energy of water into other forms. No water reservoirs are required – as the turbines either run through a water drop-off system or the natural power of the river. It is by using the eroded national distribution systems, that allows for outdated sluices and dams to be used by techniques known as ‘Micro-Hydro’. Having said that, this process could still generate 200mW of the National Capacity. When considering the installation cost of items such as this, we’re looking at somewhere between 200 pounds and 3k per kW of energy created.

Because of the energy need of the Western World, we are now seeing a rapid rise in ‘Green Energy’. The UK is very well placed to provide most of the schemes set out above, and the UK domestic market again is one of the key beneficiaries of this technology.

It is the drive for installations in the domestic sector that looks to favour jobs such as plumbers and electricians. With EEC and UK recognition of renewable energy getting ever-higher on the political agenda, the grants and financial aid for introduction of these systems can only increase. It is by gaining the right certificates that will provide opportunities and job security for the long term. Look for combined electrical and plumbing training, with a key emphasis on practical green systems and installation.

(C) 2009 S. Edwards. Try Green Engineer Certification or electricalcoursegb.co.uk/RenewableEnergyCertification.html.

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