NEW YORK (TheStreet) -- Suntech Power Holdings (STP), Frontier Oil (FTO) and SunPower (SPWRB) were the top gainers, while Seacor Holdings (CKH - Get Report), Tullow Oil and Newfield Exploration (NFX) headed the losers' list last week.

Suntech Power Holdings gained 20.2%, topping energy gainers, after the company secured an order from the UN for supplying $80 million worth of solar power systems over the next three years. Canaccord Genuity raised the stock to hold during the week.

Frontier Oil swung 14.2% higher after Simmons & Company upgraded its rating on the stock to overweight from neutral. Separately, Deutsche bank raised its price target on Frontier oil to $30 from $23. Meanwhile, Dahlman Rose rated new buy with a price target of $33. On Friday, the stock closed at $28.12.

SunPower surged 13.8% to reach 11-month highs after the company raised its 2011 earnings guidance to $2.0-$2.2 per share from the earlier $1.75-$2.05 issued in November.

Nexen ( NXY) rose 13.2% last week. Cormark Securities upgraded Nexen to buy from market perform.

Williams ( WMB - Get Report), a pipeline operator, advanced 12.5% after the company announced plans to spin off its oil and natural gas exploration business. The initial public offering (IPO) is scheduled for the third quarter.

Tesoro ( TSO) gained 10.2% during the week. Dahlman Rose rated the stock new buy with a target price of $34.0, up 40.7% from the current $24.1.

Yingli Green Energy Holdings ( YGE) advanced 9.9% after reporting 2010 fourth quarter adjusted earnings per share at 57 cents vs. estimates of 47 cents, while revenue came in at $616.1 million vs. forecast $557.3 million. Yingli guided 2011 PV module shipments to 1,700MW-1,750MW from $1,062MW reported for 2010.

Other solar stocks LDK Solar ( LDK), ReneSola ( SOL - Get Report), Trina Solar ( TSL), GT Solar International ( SOLR), and First Solar International ( FSLR) advanced around 11.8%, 11.0%, 7.4%, 1.8%, and 1.3%, respectively.

Nabors Industries ( NBR) rose 9.5% after reporting 2010 fourth quarter results. Adjusted earnings per share came in at 44 cents vs. consensus 38 cents, while operating revenue came in at $1.32 billion vs. estimated $1.27 billion. Jefferies raised its price target on the stock to $35 from $27, following the earnings announcement, reiterating its buy rating.

Cimarex Energy ( XEC) rose 8.3% last week. Lazard capital raised its price target to $136 from $122, maintaining a buy rating, after the company announced fourth quarter results and a discovery in the Permian Basin. Meanwhile, Tudor Pickering upgraded the stock to buy from accumulate. However UBS cut its rating to neutral from buy.

Noble ( NE) gained 8.1%, after Morgan Keegan rated the stock new outperform with a price target of $45, implying 7% upside from current levels.

Other movers were Helix Energy Solutions ( HLX), Superior Energy Services ( SPN), Tidewater ( TDW) and Suncor Energy ( SU), up 11.8%, 10.7%, 10.1% and 10.0%, respectively.

Among oil giants, Halliburton ( HAL - Get Report) jumped 7.8% after Morgan Keegan rated the stock new outperform with a price target of $65, implying a 35% upside from current levels. Meanwhile, Occidental Petroleum ( OXY), Murphy Oil ( MUR), and ConocoPhillips ( COP - Get Report) gained 7.6%, 7.1%, and 7.0%, respectively.

Seacor Holdings was the top loser, erasing 11.7% value, after reporting 2010 fourth quarter earnings per share at $1.27 vs. consensus $1.90.

Tullow Oil fell 3.8% during the week after a report said French oil giant Total ( TOT) is renegotiating its deal to buy a stake in the London-listed explorer's Ugandan oilfields.

Newfield Exploration ( NFX) dipped 3.3% during the week. Sterne, Agee & Leach cut its rating to neutral from buy. Meanwhile, Canaccord Genuity upgraded Newfield Exploration to buy from hold.

Ultra Petroleum ( UPL) dipped 2.2% after its 2010 fourth quarter earnings per share came in at 50 cents, below consensus 53 cents.

Among others, Ecopetrol ( EC), Petrobra Argentina ( PZE), Cie Generale de Geophysique - Veritas ( CGV) and Sasol ( SSL) dipped 3.1%, 3.0%, 2.5% and 2.3%, respectively.

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