NEW YORK ( TheStreet) -- Oasis Petroleum ( OAS), Brigham Exploration ( BEXP), CGG Veritas ( CGV), McMoRan Exploration ( MMR) and GT Solar ( SOLR) were top-performing energy stocks last week.

Meanwhile, LDK Solar ( LDK), Yingli Green Energy ( YGE), Aventine Renewable Energy Holdings ( AVRW), Trina Solar ( TSL) and ReneSola ( SOL) declined sharply.

Oasis Petroleum advanced 11.2% on strong first-quarter results. Production increased 146% to 8,090 barrels of oil equivalent (Boe) per day from the same period last year. Adjusted earnings before interest, taxes, depreciation and amortization during the March quarter rose to $41.1 million vs. $29.5 million in the first quarter of 2010.

Brigham Exploration rose 10.6%. Equity analyst Dan McSpirit of BMO Capital markets raised the stock to outperform from market perform last week. His target price for the stock is $40 per share.

CGGVeritas jumped 9.3% last week after announcing the formation of a marine joint venture with Elnusa of Indonesia. The new entity will deliver 2D and 3D marine seismic acquisition services to oil and gas company clients.

McMoRan climbed 8.6% during the week.

GT Solar closed 8.5% higher last week. The supplier of solar equipment received a $228 million order to deliver polysilicon production equipment to South Korean firm OCI.

Vestas Wind Systems (VWDRY) improved 8.2% after winning an order for 111 turbines. The order includes delivery of 111 V90, 1.8MW turbines to Enel Green Power North America in a five-year service and maintenance agreement. The company will start shipping units from the second half of 2011.

Berry Petroleum ( BRY) advanced 7.5% last week.

SeaDrill (SDRL) edged up 7.3% after North Atlantic Drilling, its 75%-owned subsidiary, received a $100 million order for the semisubmersible drilling rig West Alpha for operations in the Norwegian Continental Shelf.

Comstock Resources ( CRK) gained 7.1% during the week.

The Calgary-based oil company Bankers Pete(BNKJF) surged 7% after reporting positive quarterly results. The company's net income during the March quarter was $11.2 million, or 4 cents per diluted share, compared with a loss of $363,000 during the same period last year. Revenue rose to $72.7 million from $35.1 million in the March quarter of 2010.

NewField Exploration ( NFX) surged 6.9% during the week.

El Paso ( EP) gained 6.4% past week, buoyed by news that its Tennessee gas pipeline in Louisiana Bay that was shut down on April 21 following a leak may return to service on May 27.

Southern Union Company ( SUG) and Worley Parsons (WYGPY) closed 6.1% and 5.8% higher last week, respectively.

Enerplus ( ERF) rose 5.8% on analyst upgrades. TD Newcrest's equity analyst Roger Serin upgraded the stock from hold to buy with a target price of around $37 per share, while Canaccord Genuity raised the stock to buy from hold with a target price of around $33 per share.

Petroleum Geo Services(PGSVY) rose 5.8%, OGX Petroleum (OGXPY) gained 5.7%, Ultra Petroleum ( UPL) increased 5.7%, Complete Production Services ( CPX) rose 5.6%, Cobalt International Energy ( CIE) was up 5.5%, Petrohawk Energy ( HK) gained 5.4% and Continental Resources ( CLR) increased 5.4%.

LDK Solar was the top loser last week, plunging 24.4%. Among the catalysts for its slide was an announcement that the company was pulling a planned dollar-denominated note offering. Also last week, Jeffery Bencik of Kaufman downgraded the stock to hold from buy with a target price of $8 per share.

Yingli Green Energy shed 15.1% after reporting disappointing first-quarter earnings. Adjusted earnings per share came in at 38 cents, vs. an expected 41 cents. Revenue was lower than expected at $527.3 million, vs. analysts' estimates for $582.2 million.

Aventine Renewable Energy fell 13.9%, Trina Solar declined 13.3% and Renesola slid 12.1% last week.

SunTech Power ( STP) shed 9.6% after a brokerage downgrade. Analysts at Collins Stewart cut the stock to neutral from buy and lowered the price target to $8 from $10.

Meanwhile, JX Holdings (JXHLY) fell 9.5%, JA Solar ( JASO) declined 9.3%, Atlas Energy ( ATLS) slid 7.8%, OMV (OMVKY) declined 6.8%, Transatlantic Petroleum ( TAT) fell 6.5% and Surgutneftegas (SGTPY) declined 6.3%.

Niska Gas Storage Partners ( NKA) slid 5.3% after a brokerage downgrade. Raymond James, equity analyst at Darren Horowitz, downgraded the stock to market perform from outperform.

Other losers were Canadian Oil Sands ( COSWF), down 4.7%; Atlas Pipeline Partners ( APL), down 4.4%; Premier Oil (PMOIY), down 4.2%; and Statoil ( STO), down 3.8%.

Tidewater ( TDW) declined 3.5% on a rating cut at Simmons & Co during the week.

Other laggards were Cameron International ( CAM) and Teekay LNG Partners ( TGP), which fell, 3% and 2.8%, respectively.

OAO Tatneft (OAOFY) lost 2.7% last week on Russia's plans to increase export duties on petroleum products like LPG, gasoline, and heavy oil.

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