Suntech Power Holdings Co.'s (STP, K3ND.SG) first-quarter earnings rose 54% as shipments and revenue surged though currency hedging losses and concerns over sales in Europe weighed on the bottom line.

Pricing pressure also prompted the company to cut its full-year revenue guidance by $100 million, with a new forecast of $3.3 billion to $3.5 billion.

Suntech's ADS were off 2.2% to $7.49 premarket Wednesday. They were down 23% over the past three months through Tuesday's close.

China-based Suntech has grown to become the world's largest solar-panel maker as government renewable-energy incentives drive increasing worldwide demand. It posted mostly higher profits over the past year, but uncertainty surrounding some subsidies, particularly in
Italy , have threatened its top line.

Chairman and Chief Executive of Zhengrong Shi said the uncertainty in
Italy , a long winter in Germany and first-quarter seasonality contributed to a sequential decline in sales, though Shi added the company saw greater demand in other emerging markets, including China .

Suntech has diversified its production base and selling markets lately by adding shifts at its
Arizona manufacturing plant and launching projects across the Americas and Asia-Pacific region.

Suntech reported a first-quarter profit of $31.9 million, or 17 cents an American depositary share, up from $20.7 million, or 11 cents an ADS, a year earlier. Losses from hedging activities contributed to $56.9 million in other expenses in the latest quarter, compared with a $2.8 million gain a year earlier. Revenue jumped 49% to $877 million.

Analysts polled by Thomson Reuters most recently forecast a 35-cent per-share profit and $864 million in revenue.

Shipments grew 63% from a year earlier but fell 3.1% from the fourth quarter. The company's March forecast had called for relatively flat sequential growth.

Gross margin narrowed to 19% from 19.5%.