Shares of solar-energy companies were mixed in trading Thursday morning.

First Solar ( FSLR), which announced Wednesday that it will build the largest photovoltaic power plant in the U.S., was down 1.2% to $147.54.

First Solar said the 48-megawatt plant will produce power for roughly 30,000 homes. It will be added to the existing 10-megawatt El Dorado plant run by Sempra Generation, a subsidiary of Sempra Energy ( SRE), in Boulder City, Nev.

"We are pleased to have the opportunity to expand this 10MW (megawatt) project to 58MW -- more than five times its original size, advancing our mission of providing clean, affordable solar electricity," said John Carrington, First Solar executive vice president of marketing and business development. "Sempra Generation's decision to use First Solar in expanding the El Dorado solar plant demonstrates our ability to provide a cost-effective energy solution for utility scale projects."

China Sunergy ( CSUN), which on Thursday announced the departure of board member Dr. Fengming Zhang, was trading higher at $3.15, up 0.6%. Zhang resigned from his positions of vice president of manufacturing technology and board director.

Yingli Green Energy ( YGE) announced a $50 million drawdown under a three-year loan facility by a fund managed by Asia Debt Management Hong Kong Limited. The company also announced the renewal of credit lines up to an aggregate amount of 1 billion renminbi with the Export-Import Bank of China.

"This initial cooperation with ADM Capital, in conjunction with the extension of our long-term cooperation with China Eximbank, is not only evidence of the market's confidence in Yingli's value proposition and business development potential, but also a reflection of the Company's successful efforts to ensure our strong capital position," said Zongwei Li, director and CFO. Shares of Yingli were down 0.4% to $7.32.

Elsewhere, Green Plains Renewable Energy ( GPRE) was up 1.9% to $2.

Energy Conversion Devices ( ENER) was down 0.7% to $15.21.

JA Solar ( JASO) was up 2.4% to $3.65.

LDK Solar ( LDK) was trading at $8.48, up 1.2%.

Canadian Solar ( CSIQ) was down 1% to $6.86.

Solarfun ( SOLF) was up 4.4% to $4.78.

Suntech Power ( STP) was down 2.3% to $14.31.

SunPower ( SPWRA) was up 0.3% to $26.33.
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