SolarCity has, however, reduced its forecast, citing costs, for megawatt installations for this year.
The company withdrew its 2011 forecast, citing regulatory scrutiny and a possible 40 percent decline in new students.
A British food producer, Northern Foods, lowered its annual profit forecast, citing lower-than-expected sales over the holidays.
The company gave no earnings forecast, citing "the uncertainty of several factors that may affect our financial results".
FedEx on Monday sharply cut its quarterly profit forecast, citing higher fuel costs and severe winter weather that disrupted delivery operations in the United States and Europe.
Molina Healthcare, an insurance company, plunged $7.99, or 31 percent, to $17.77 after it withdrew its 2012 profit forecast, citing a possible revenue shortfall in Texas.
Ryder Systems slumped 13 percent to $35.44 after the company, which provides transportation and logistics services, cut its quarterly earnings forecast, citing lower demand at its commercial rental business.
Early this month, A.M.D., which is based here, slashed its second-quarter revenue forecast, citing weaker-than-expected sales in China and Europe and lackluster consumer demand over all.
The engineering and construction company KBR lowered its 2012 earnings forecast, citing higher-than-expected project charges in its minerals and construction units.
