Wind Power Generation

Terra Renewables


Terra Renewables

Wind Power generation solutionsThe Terra Power Solutions Team

Terra Renewables proposed solution for the intermittency of wind power and other renewable power sources is to create a super grid of interconnected wind energy facility across the Eastern and Western Cape. This large-scale array of dispersed wind energy facility would be located in different wind regimes, negating the overall variation in power output.

Renewables is recognised as an International Industry leader for having a well organised approach to the various aspects of developing large wind turbine and solar installations. Renewables aspires to apply the best standards and procedures covering all aspects to be included in the project development.

Our project activities fall into our 6 phase approach to the development of Solar and Wind Farms 

Summary of Terra Renewables Wind Projects

What is Wind Power?

SA wind mapIt involves the conversion of the energy in the wind into a useful form, such as electricity, using wind turbines. At the end of 2008, worldwide capacity typically expressed in Gigawatts (GW)) of wind-powered generators was 120.8 gigawatts. Although wind produces only about 1.5% of worldwide electricity use, it is growing rapidly, having doubled in the three years between 2005 and 2008. In several countries it has achieved relatively high levels of penetration, accounting for approximately 19% of electricity production in Denmark, 10% in Spain and Portugal, and 7% in Germany and the Republic of Ireland in 2008.

The principal application of wind power today is the generation of electricity. Large scale wind energy facilities are typically connected to the local electric power transmission network. Wind energy as a power source is favoured by many environmentalists as an alternative to fossil fuels, as it is plentiful, renewable, widely distributed, clean, and produces lower greenhouse gas emissions, although the construction of wind energy facility is not universally welcomed due to their visual impact, localised noise, bird and insect populations and other effects on the environment. The intermittency of wind seldom creates problems when using wind power to supply a low proportion of total demand. Where wind is to be used for a moderate fraction of demand, additional costs for compensation of intermittency are considered to be modest.

Determination of electricity generation capability

The strength of wind varies in magnitude and direction as well as density, and an average value for a given location does not alone indicate the amount of energy a wind turbine could produce there. To assess the wind energy at a particular location, a probability distribution function is often used to help us understand the accuracy of the observed data. Different locations will have different wind speed distributions.

Because so much power is generated by higher wind speed, much of the energy comes in short bursts. The consequence is that wind energy from a particular turbine or wind energy facility does not have as consistent an output as fuel-fired power plants.

Wind power density (WPD) is a calculation relating to the effective force of the wind at a particular location, frequently expressed in terms of the elevation above ground level over a period of time. It further takes into account wind velocity and mass. Colour coded maps are frequently prepared for a particular area described, for example, as "Mean Annual Power Density at 50 Meters."

More information on Electricity Generation

Factors to consider when establishing a wind farm