NEW YORK ( TheStreet) - SunPower (SPWRA), Southern Union (SUG), Chesapeake Midstream Partners (CHKM) and Bristow Group (BRS - Get Report) clocked smart gains this week, while Frontline (FRO - Get Report), Yingli Green Energy Holding (YGE - Get Report), GT Solar International (SOLR) and Trina Solar (TSL - Get Report) fared badly.
Among the advancers, SunPower gained 10.1%.
Southern Union topped the charts, jumping 2.7%. Williams has increased its bid on the company to about $5.6 billion in cash, topping its own previous bid of $5 billion in cash.
Chesapeake Midstream Partners rose 1%, Bristow Group edged up 0.9% and PAA Natural Gas Storage (PNG) moved 0.9% higher.Complete Production Services (CPX) advanced 0.8% after equity analyst Brian Uhlmer at Global Hunter Securities raised the stock's rating to buy from accumulate with a target price of $45 per share. Williams Partners (WPZ - Get Report) advanced 0.7% on receiving an FERC endorsement to increase its Transco natural gas pipeline network by another 142,000 dekatherms of incremental firm natural gas transportation capacity by November 2012. EQT Corporation (EQT - Get Report) rose 0.5% after SunTrust Robinson's equity analyst Neal Dingmann upgraded the stock to buy from neutral with a 12-month target price of $68 per share. Frontline was the top lagger, shedding 14.2% after Morgan Stanley lowered its price target to $14.5 from $16. Credit Suisse has also cut the stock's price target from $18 per share to $12. Yingli Green Energy lost 14% after Goldman cut its rating on the stock to sell from neutral with a price target of $8 per share. GT Solar and Trina Solar declined 11.3% and 11.2%, respectively. CGG Veritas (CGV) erased 10.9% after Barclays Capital downgraded the stock to equal weight from overweight with a target price of 31 euros per share. Reversing to the downside were Denbury Resources (DNR - Get Report) down 8.9%, EXCO Resources (XCO - Get Report) shedding 8.9%, Hess Corp (HES - Get Report) trimming 7.9%, Suntech Power Holdings (STP) erasing 7.8%, Bill Barett Corporation (BBG - Get Report) losing 7.7% and Talisman Energy (TLM - Get Report) retreating by 7.6%. ReneSola (SOL - Get Report) lost 7.5% after the company lowered its second-quarter revenue guidance to the range of $235 million to $245 million, from $280 million to $300 million, owing to declining wafer prices. Statoil ASA (STO - Get Report) decreased 7.4% after Standard & Poor's equity analyst Christine Tiscareno downgraded the stock to sell from buy. Other losers included SandRidge Energy (SD - Get Report), First Solar (FSLR - Get Report), STR Holdings (STRI - Get Report), Eni SPA (E), Oasis Petroleum (OAS - Get Report), Pioneer Natural Resources (PXD - Get Report) and YPF SA (YPF - Get Report).