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As solar-power companies expand manufacturing capacity to take advantage of growing global demand for their products, Chinese companies have dominated factory expansions this year, according to a study released Thursday by iSuppli Corp.

Of the 10 solar-panel and solar-cell makers that have announced the largest expansion plans this year, seven are Chinese companies, according to iSuppli. Together, the Chinese companies are set to expand manufacturing capacity by 6.4 gigawatts, or about 72% of the 10 companies' expansion, according to iSuppli, a market research firm based in El Segundo, Calif.

"While European countries like Germany are leading the world in solar installations, China has built a dominant position in the manufacturing of cells and modules that are used in these systems," Greg Sheppard, iSuppli's chief research officer, said in a statement. "With Chinese cell and module manufacturers now engaged in a race to expand manufacturing, the country is certain to maintain and expand its dominant position."

China-based LDK Solar Co. Ltd. (LDK), is expanding the most this year, with 1.3 gigawatts of new solar-panel manufacturing capacity expected in 2010, iSuppli said.

Norway-based Renewable Energy Corp. ASA (REC.OS) is second, with plans to expand manufacturing capacity this year by nearly 1.1 gigawatts, followed by China-based Suntech Power Holdings Co. Inc. (STP, K3ND.SG), which plans to expand production by a little more than 1 gigawatt this year.

ISuppli estimated that the global solar-photovoltaic industry will spend about $11 billion this year on production equipment, including equipment used to make solar-panel components such as ingots, wafers and polysilicon.

-By Cassandra Sweet, Dow Jones Newswires; 415-269-4446; cassandra.sweet@dowjones.com