Wind energy expansion has been concentrated in a limited number of regions, however, and wind power remains a relatively small fraction of global electricity supply. Further expansion of wind energy, especially in regions of the world with little wind turbines deployment to date and in offshore wind farm locations, is likely to require additional policy measures.

Wind energy has quickly established itself as part of the mainstream electricity industry. From a cumulative wind capacity of 14 GW at the end of 1999, global installed wind power capacity increased 12-fold in 10 years to reach almost 160 GW by the end of 2009 and 197 in 2010, an average annual increase in cumulative capacity of 28%.

Global annual wind farm capacity additions equalled more than 38 GW in 2009, up from 26 GW in 2008 and 20 GW in 2007. The majority of the wind farm capacity has been installed onshore, with offshore wind turbines installations constituting a small proportion of the total market. About 2.1 GW of offshore wind turbines were installed by the end of 2009; 0.6 GW were installed in 2009, including the first commercial offshore wind power plant outside of Europe, in China.

Many of these offshore wind farm installations have taken place in the UK and Denmark. Significant offshore wind power plant development activity, however, also exists in, at a minimum, other EU countries, the USA, Canada and China. Offshore wind energy is expected to develop in a more significant way in the years ahead as the technology advances and as onshore wind energy sites become constrained by local resource availability and/or siting challenges in some regions.

The total investment cost of new wind power plants installed in 2009 was USD2005 57 billion. Direct employment in the wind energy sector in 2009 has been estimated at roughly 190,000 in the EU and 85,000 in the USA. Worldwide, direct employment has been estimated at approximately 500,000.

Despite these trends, wind energy remains a relatively small fraction of worldwide electricity supply. The total wind power capacity installed by the end of 2009 would, in an average year, meet roughly 1.8% of worldwide electricity demand, up from 1.5% by the end of 2008, 1.2% by the end of 2007, and 0.9% by the end of 2006.

The countries with the highest total installed wind power capacity by the end of 2009 were the USA (35 GW), China (26 GW), Germany (26 GW), Spain (19 GW) and India (11 GW). After its initial start in the USA in the 1980s, wind energy growth centred on countries in the EU and India during the 1990s and the early 2000s. In the late 2000s, however, the USA and then China became the locations for the greatest annual wind farm capacity additions.

Regionally, Europe continues to lead the market with 76 GW of cumulative installed wind power capacity by the end of 2009, representing 48% of the global total (Asia represented 25%, whereas North America represented 24%). Notwithstanding the continuing growth in Europe, the trend over time has been for the wind energy industry to become less reliant on a few key markets, and other regions of the world have increasingly become the dominant markets for wind energy growth.

The annual growth in the European wind energy market in 2009, for example, accounted for just 28% of the total new wind power additions in that year, down from over 60% in the early 2000s. More than 70% of the annual wind power capacity additions in 2009 occurred outside of Europe, with particularly significant growth in Asia (40%) and North America (29%).

Even in Europe, though Germany and Spain have been the strongest markets during the 2000s, there is a trend towards less reliance on these two countries. Despite the increased globalization of wind power capacity additions, the market remains concentrated regionally.

Latin America, Africa and the Middle East, and the Pacific regions have installed relatively little wind power capacity despite significant technical potential in each region. And, even in the regions of significant growth, most of that growth has occurred in a limited number of countries. In 2009, for example, 90% of wind power capacity additions occurred in the 10 largest markets, and 62% was concentrated in just two countries: China (14 GW, 36%) and the USA (10 GW, 26%).

In both Europe and the USA, wind energy represents a major new source of electric capacity additions. From 2000 through 2009, wind energy was the second-largest new resource added in the USA (10% of all gross capacity additions) and EU (33% of all gross capacity additions) in terms of nameplate capacity, behind natural gas but ahead of coal.

In 2009, 39% of all capacity additions in the USA and 39% of all additions in the EU came from wind energy. In China, 5% of the net capacity additions from 2000 to 2009 and 16% of the net additions in 2009 came from wind farm. On a global basis, from 2000 through 2009, roughly 11% of all newly installed net electric capacity additions came from new wind power plants; in 2009 alone, that figure was probably more than 20%.

A number of countries are beginning to achieve relatively high levels of annual wind power electricity penetration in their respective electric systems. On this basis, and focusing only on the 20 countries with the greatest cumulative wind power capacity, at the end of 2009, wind power capacity was capable of supplying electricity equal to roughly 20% of Denmark’s annual electricity demand, 14% of Portugal’s, 14% of Spain’s, 11% of Ireland’s and 8% of Germany’s.

http://srren.ipcc-wg3.de/report/IPCC_SRREN_Ch07