Shares of solar energy companies finished lower on Monday, and a report on Barron's Online said that SunPower ( SPWRA) would be negatively impacted by aggressive pricing from Suntech Power ( STP). Mehdi Hosseini of Friedman Billings Ramsey wrote that "continued weakness in end-market demand, uncertainties associated with the business model for both SPWRA and First Solar ( FSLR) and increased downside risk to company management guidance/consensus estimates are keeping us on the sidelines and actually have us incrementally more cautious into Q1 earnings." Sunpower finished down 8.4% to $24.23. Suntech closed down 13.1% to $12.82. First Solar was down 3.7% to $138.48. Trina Solar ( TSL) was down 3.1% to $12. Trina, which manufactures solar photovoltaic products, on Monday said it had entered into three sales agreements with customers in Germany for the delivery of about 42 megawatts of photovoltaic modules in 2009. "We expect to capture more market share in both established and emerging PV markets, such as Australia, the Benelux market, China, France, Greece, Korea and the United States," said Arturo Herrero, vice president of sales and marketing at the Changzhou, China-based company. Canadian Solar ( CSIQ) was down 11.5% to $5.72. China Sunergy ( CSUN) was off 7.5% to $2.61. Energy Conversion Devices ( ENER) was off 9.8% to $14.26. JA Solar ( JASO) was lower by 10.6% to $3.05. LDK Solar ( LDK) was down 13.1% to $7.29. Solarfun ( SOLF) was down 11.9% to $3.93. Green Plains Renewable Energy ( GPRE) was off by 1.5% to $2. Yingli Green Energy ( YGE) closed down 13.7% to $6.05.