NEW YORK (TheStreet) -- Among energy stocks, Inter Oil (IOC) and Yingli Green (YGE) showed strength this past week, where Frontline (FRO - Get Report), RPC Solar (RES - Get Report) and Nabors Industries (NBR - Get Report) pared significant losses.

InterOil topped the gainers last week, jumping 15.8% after announcing an agreement with Gunvor Singapore Pte., for the supply of one million tons per annum of liquefied natural gas from the Gulf LNG project in Papua, New Guinea.

Yingli Green climbed 11.4% after announcing a Strategic Financing Relationship with lender CIT Group ( CIT). Under the agreement, CIT will provide financing options for the purchase and installation of modules to customers of Yingli Americas. Analysts at Jefferies have reiterated a buy on the stock.

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LDK Solar ( LDK) accumulated 3.7%. The company reported net sales of $471.9 million for the third quarter of fiscal 2011.

MarkWest Energy ( MWE) advanced 2.6% after analysts at UBS AG raised the earnings estimates for the company's stock and affirmed a buy rating with a price target of $57, from the previous positive rating and price target of $51.

Sunoco ( SUN - Get Report) and Kinder Morgan Management ( KMR) moved up 1.9% and 1.5%, respectively last week. Citigroup ( C) and Sunoco announced a multi-year renewal of their long-standing U.S. private-label credit card relationship. Analysts at Tudor Pickering have a buy rating on the stock.

Frontline led losers for the week, wiping out 51.9% on the heels of its unfavorable third quarter results. The company reported net loss of $44.7 million, excluding a vessel impairment loss of $121.4 million. FBR Capital has downgraded the stock from market perform to underperform with a price target of $1.50, indicating a downside of 46% from current levels.

RPC dropped 16.5%. Crude oil prices declined 0.2% at close last week. However, mid-week prices were down almost 2%.

Nabors Industries and Advantage Oil & Gas ( AAV) shed 15.4% each last week. The law offices of Howard G. Smith announced it is investigating potential claims against Nabors industries and its directors related to the company's executive compensation practices for its CEO and other executives. Advantage Oil & Gas was downgraded by analysts at RBC capital from outperform to sector perform.

Atwood Oceanics ( ATW) dropped 14.3%

Quicksilver Resources ( KWK) and Halliburton Company ( HAL - Get Report) declined 14.2% and 14.1%, respectively last week. Quicksilver Resources Chief Executive Glenn Darden told Reuters in an interview that its capital expenditure budget could be $200 million lower than the year's planned spending of $696 million.