NEW YORK ( TheStreet) -- Energy XXI (Bermuda) ( EXXI), Halliburton ( HAL), Chevron ( CVX), El Paso Pipeline Partners ( EPB), Complete Production Services ( CPX), Sinopec ( SNP), Schlumberger ( SLB) and InterOil Corporation ( IOC) have up to 100% buy ratings, as per a Bloomberg consensus estimate.

Improved consumer spending has eased the concerns of declining demand for oil from the world's largest economy. Crude oil gained over 2% to settle at two-week highs with WTI prices hovering at around $87.3 per barrel at close Monday. Oil prices firmed during the last one week, getting a push from Hurricane Irene.

These eight stocks from the energy sector could generate a mean return of 47% over the next one year. They have outperformed the Dow in the last one year gaining 34% compared to the latter's 14% increase. The stocks are arranged in the ascending order of buy ratings.

8. Chevron ( CVX) is a $200 billion energy major with both upstream and downstream operations.

Net income for the second quarter of 2011 was reported at $7.7 billion, improving from $5.4 billion in the same quarter prior year. Sales rose to $69 billion from $53 billion in the year-ago quarter, riding on higher crude oil prices.

"We reached an important milestone in streamlining our downstream asset portfolio with receipt of government approval for the planned sale of our refining and marketing assets in the United Kingdom and Ireland," said John Watson, the company's CEO. During the quarter, Chevron completed the sale of its fuels-marketing and aviation businesses in three Central American countries, as well as other assets in North America and China.

Chevron's capital outlay was $13.4 billion for the first six months of 2011, and it is actively pursuing projects in the upstream segment.

The stock gained 34% during the last one year and is trading at 7.3 times with 81% buy ratings. Chevron's 2011 earnings are estimated to grow with 25% upside.

7. InterOil Corporation ( IOC) is an independent energy company operating in the upstream, midstream and downstream business segments.

Net profit reported for the second quarter of 2011 was $23.5 million compared with $7.8 million during the same quarter of 2010. The company's operating segments of corporate, midstream refining and downstream were profitable and yielded $34.5 million collectively, while the development segments of upstream and midstream liquefaction recorded combined net losses of $11 million.

During the quarter, total revenue increased to $304 million from $225 million in the same period prior year. Earnings before interest, taxes, depreciation and amortization for the quarter were a gain of $39 million, compared to a gain of $15 million in the year-ago quarter. Improved performance of the refining and downstream segments contributed towards higher gross profits.

The company recently signed an agreement to supply one million tons per annum of LNG to Noble Clean Fuels from its proposed Gulf LNG project in Papua New Guinea.

Analysts polled by Bloomberg recommend an impressive 83% buy rating on the stock and 70% upside over the next one year.

6. Complete Production Services ( CPX) provides oil and gas companies products and services to develop hydrocarbon reserves.

For the second quarter of 2011, the company reported net income of $54.5 million from $15.7 million in the same quarter last year. Adjusted EBITDA, as a percentage of sales, was 29.5% for the second quarter, benefiting from increased activity by upstream companies, as well as the deployment of the company's third frac fleet in July.

Revenue increased 53% year-over-year to $552 million, on improved activity and deployment of new assets. The company completed a $15.6 million acquisition of a hydraulic snubbing and production testing business. During the quarter, the company incurred capital expenditure of $93 million.

Based on analysts' consensus estimate, the stock is expected to deliver 77% over the next one year and is trading at 10.2 times its estimated 2011 earnings. Analysts polled by Bloomberg recommend an 86% buy rating on the stock.

5. Schlumberger ( SLB) is a supplier of technology, integrated project management and information solutions to the oil and gas industry.

Net revenue for the second quarter of 2011 was $9.6 billion compared to $5.9 billion in the same quarter prior year. Revenue from oilfield services grew 51% year-over-year in the June quarter, contributing 90% towards revenue.

Net income stood at $1.18 billion, up 22% from the same quarter in 2010.

The company repurchased shares worth $700 million during the quarter. The stock's key growth drivers in 2011 are technology upgrades required for exploration and deepwater operations. Surging oil prices could support additional drilling activity in North America and the Middle East, led by Saudi Arabia and Iraq. The stock has analysts' buy ratings of 89% and is likely to return 50% in the next one year. The scrip is trading at 14 times its estimated 2012 earnings.

4. Halliburton ( HAL) is an oil-field services company providing services and products for the exploration, development and production of oil and natural gas.

Net income for the second quarter of 2011 was reported at $747 million, vs. 483 million in the first quarter prior year. Consolidated revenue improved to $5.9 billion from $4.4 billion in the same quarter last year. Operating income increased to $1.2 billion from $762 million in the June quarter of 2010 on the improving pricing environment and higher equipment utilization.

On the geographies that delivered strong performance, Dave Lesar, the company's CEO, said, "North America revenue grew by 16% sequentially compared to United States rig activity growth of 6%, with incremental operating margins of greater than 50% for both divisions. International revenue grew 8% from the prior quarter, with 18% operating income growth, excluding the impact of Libya and employee separation costs. Strong sequential operating income improvement was driven by seasonal recovery in the North Sea and Russia as well as improved activity in Latin America and Asia."

At the end of the quarter, cash balance was $1.4 billion. With analysts' buy ratings of 92% and upside potential of 68%, the stock looks a good bet over the next one year. It is trading at 12.8 times its estimated 2011 earnings.

3. Energy XXI (Bermuda) ( EXXI) is an independent oil and natural gas exploration and production company with business interests in the U.S. Gulf Coast and Gulf of Mexico.

Net profit for the fourth quarter of fiscal 2011 was $36 million on revenue of $282 million and production of 42,100 barrels of oil equivalent per day. The results include contribution from acquisitions made in certain Gulf of Mexico properties. Energy XX1 reported earnings before interest, tax, and depreciation of $166 million as against $79 million in 2010 fiscal fourth quarter.

Increased production and cash flows strengthened the company's balance sheet as it managed to reduce debt by $200 million during the last six months of fiscal 2011. The stock gained 32% in the last one-year and is trading at 10.3 times its estimated 2011 earnings. Of the 14 analysts covering the stock, 13 rate a buy. The stock is expected to deliver 51% over the next one year, according to analysts' consensus estimate.

2. El Paso Pipeline Partners ( EPB) owns and operates natural gas transportation pipelines and storage assets in the U.S.

Net income in the second quarter came in at $98 million, up 56% from the corresponding quarter of 2010. Adjusted EBITDA was robust, growing 43% to $238 million.

"Our portfolio of high-quality assets continues to grow through acquisitions and expansions. During the quarter, we completed the acquisition of additional interests in CIG and SNG, and now own 100 percent of SNG. We also placed into service additional expansion projects which brings our total to fourteen in less than three years. Our successful acquisitions and expansions have enabled us to deliver consistent distribution growth, as we have increased quarterly distributions every quarter since our IPO in 2007," said Jim Yardley, the company's CEO

During the first half of 2011, the company's capital expenditure was $88 million. The stock has 93% buy rating and is likely to return 16% over the next one year. It is trading at 16 times its estimated 2011 earnings.

1. Sinopec ( SNP) is a China-based integrated oil & gas and chemical company. The company generates around three-fifths of its revenue from its refining segment, while exploration and production and chemicals contribute the remainder.

Sinopec owns eight of the top ten refineries in China and its refining capacity is ranked second globally. China's new refined oil pricing mechanism in 2008 turned Sinopec's refining business around, after years of loss making. However, the giant refiner is vulnerable to any spikes in crude oil prices as it buys more than 70% of its supply from the global markets. As part of its diversification plans, Sinopec intends to build shale gas resources.

Net income jumped 12% during the second quarter of 2011, while revenue improved 31.5%. For the first half of 2011, output was 253.88 billion cubic feet of natural gas and 150 million barrels of crude oil, representing an increase of 70 basis points from the same period last year, respectively.

Analysts polled by Bloomberg have 100% buy rating on the stock. Upstream asset injections from parent company and changes to refined product pricing mechanism could trigger upsides. The stock has appreciated 23% so far in 2011 and analysts' consensus estimate expects 19% increase over the next one year. The stock is trading at 6.4 times its estimated 2011 earnings.