Renewable energy has been called impractical for its small scale and large expense compared to conventional power production methods. Now, one area of development is answering those criticisms by getting very big to cut costs. New offshore wind facilities now going online are equal in size to the largest gas- or coal-fired power stations. The world’s largest wind facility, the London Array, located off England’s east coast, produces 630 megawatts of capacity, equal to traditional fossil-fuel power generators. And a project 10 times that size to be located nearby is in the planning stages. Siemens, the German power systems company, estimates that there are now 3.3 gigawatts of offshore wind power connected to the European power grid. That capacity is equal to the output of a large nuclear power station. And the global market for offshore wind power is expected to grow 20 percent a year for the next few years. The economies of scale in building very large wind power plants offshore instead of on land mean that costs can come down. Siemens estimates they are declining at the rate of 40 percent a decade. There are still money issues to resolve. Costs to install and maintain offshore wind power plants are high, pricing the power produced at about triple the general wholesale power price. Subsidies are still needed to launch these innovative startups. But the new offshore wind power plants increasingly look to be a key part of the global effort to reduce carbon emissions and conserve natural resources in a world of rapidly expanding demand for power. I’m John Howell for 3BL Media. Continue reading
DUBLIN–(BUSINESS WIRE)- Wind turbines have begun to be used for electrical generation, having previously been used for agricultural and grinding purposes. Initial wind turbines had a very small capacity, as well as very low efficiency and performance standards. Wind turbines have gone through various technological advancements during the time they have been in use. Each and every component of a wind turbine has been upgraded to make wind power generation more reliable and efficient.
Multi-Megawatt (MW) wind turbines are currently in use, which are easily delivering an availability factor of 95% or higher. A number of technological changes have been made to wind turbines, all of which have resulted in the improved performance of wind power generation.
Rotor blades have seen improvements in blade aerodynamic profiles as well as improvements in blade material properties, resulting in the production of large rotor blades that have made wind turbines capable of capturing more wind power. Wind turbines used to be fitted with gearboxes with a higher gear ratio, which had high maintenance requirements and low reliability. Continue reading