NEW YORK (TheStreet) -- The energy sector declined through the first quarter of 2015 and then pared some of its losses in the second quarter. Through the first half, the S&P energy index declined by 6%, compared to a meager 0.2% gain for the S&P 500 as a whole.

Yet, some energy stocks even underperformed compared to the very low bar set by this sector. Here are the 10 worst. 

Because the bargain stock bin is a great place to find good values, TheStreet paired the 10 worst performing energy sector stocks with TheStreet Ratings to determine whether they really are good investments going forward.

TheStreet Ratings, TheStreet's proprietary ratings tool, projects a stock's total return potential over a 12-month period including both price appreciation and dividends. Based on 32 major data points, TheStreet Ratings uses a quantitative approach to rating over 4,300 stocks to predict return potential for the next year. The model is both objective, using elements such as volatility of past operating revenues, financial strength, and company cash flows, and subjective, including expected equities market returns, future interest rates, implied industry outlook and forecasted company earnings.

Buying an S&P 500 stock that TheStreet Ratings rated a "buy" yielded a 16.56% return in 2014 beating the S&P 500 Total Return Index by 304 basis points. Buying a Russell 2000 stock that TheStreet Ratings rated a "buy" yielded a 9.5% return in 2014, beating the Russell 2000 index, including dividends reinvested, by 460 basis points last year.

Check out which stocks were among the worst energy performers in the S&P 500 for the quarter. And when you're done with that be sure to find out which financial stock had the worst performance in the S&P 500 for the first quarter.

 

RIG ChartRIG data by YCharts
10. Transocean Ltd. (RIG - Get Report)

Market Cap: $5.9 billion
Year-to-date return: -12%
TheStreet Ratings: Sell, D+

Transocean Ltd., together with its subsidiaries, provides offshore contract drilling services for oil and gas wells worldwide. The company primarily offers deepwater and harsh environment drilling services.

"We rate TRANSOCEAN LTD (RIG) a SELL. This is driven by a number of negative factors, which we believe should have a greater impact than any strengths, and could make it more difficult for investors to achieve positive results compared to most of the stocks we cover. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, disappointing return on equity, generally disappointing historical performance in the stock itself and feeble growth in its earnings per share."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The company, on the basis of change in net income from the same quarter one year ago, has significantly underperformed when compared to that of the S&P 500 and the Energy Equipment & Services industry. The net income has significantly decreased by 205.9% when compared to the same quarter one year ago, falling from $456.00 million to -$483.00 million.
  • Return on equity has greatly decreased when compared to its ROE from the same quarter one year prior. This is a signal of major weakness within the corporation. Compared to other companies in the Energy Equipment & Services industry and the overall market, TRANSOCEAN LTD's return on equity significantly trails that of both the industry average and the S&P 500.
  • Despite any intermediate fluctuations, we have only bad news to report on this stock's performance over the last year: it has tumbled by 64.27%, worse than the S&P 500's performance. Consistent with the plunge in the stock price, the company's earnings per share are down 203.93% compared to the year-earlier quarter. Naturally, the overall market trend is bound to be a significant factor. However, in one sense, the stock's sharp decline last year is a positive for future investors, making it cheaper (in proportion to its earnings over the past year) than most other stocks in its industry. But due to other concerns, we feel the stock is still not a good buy right now.
  • TRANSOCEAN LTD has experienced a steep decline in earnings per share in the most recent quarter in comparison to its performance from the same quarter a year ago. The company has reported a trend of declining earnings per share over the past two years. However, the consensus estimate suggests that this trend should reverse in the coming year. During the past fiscal year, TRANSOCEAN LTD swung to a loss, reporting -$5.25 versus $3.85 in the prior year. This year, the market expects an improvement in earnings ($2.36 versus -$5.25).
  • RIG, with its decline in revenue, underperformed when compared the industry average of 1.9%. Since the same quarter one year prior, revenues fell by 12.7%. Weakness in the company's revenue seems to have hurt the bottom line, decreasing earnings per share.

 

CVX ChartCVX data by YCharts
9. Chevron Corporation (CVX - Get Report)

Market Cap: $181.4 billion
Year-to-date return: -14%
TheStreet Ratings: Hold, C

Chevron Corporation, through its subsidiaries, engages in the petroleum, chemicals, and power and energy operations worldwide. The company operates in two segments, Upstream and Downstream.

"We rate CHEVRON CORP (CVX) a HOLD. The primary factors that have impacted our rating are mixed ? some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company's strengths can be seen in multiple areas, such as its reasonable valuation levels and largely solid financial position with reasonable debt levels by most measures. However, as a counter to these strengths, we also find weaknesses including feeble growth in the company's earnings per share, deteriorating net income and disappointing return on equity."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • CVX's debt-to-equity ratio is very low at 0.22 and is currently below that of the industry average, implying that there has been very successful management of debt levels. Although the company had a strong debt-to-equity ratio, its quick ratio of 0.96 is somewhat weak and could be cause for future problems.
  • Regardless of the drop in revenue, the company managed to outperform against the industry average of 38.7%. Since the same quarter one year prior, revenues fell by 37.9%. Weakness in the company's revenue seems to have hurt the bottom line, decreasing earnings per share.
  • The company, on the basis of change in net income from the same quarter one year ago, has significantly underperformed against the S&P 500 and did not exceed that of the Oil, Gas & Consumable Fuels industry. The net income has significantly decreased by 43.1% when compared to the same quarter one year ago, falling from $4,512.00 million to $2,567.00 million.
  • The company's current return on equity has slightly decreased from the same quarter one year prior. This implies a minor weakness in the organization. In comparison to the other companies in the Oil, Gas & Consumable Fuels industry and the overall market, CHEVRON CORP's return on equity is significantly below that of the industry average and is below that of the S&P 500.

 

SWN ChartSWN data by YCharts
8. Southwestern Energy Company (SWN - Get Report)

Market Cap: $8.7 billion
Year-to-date return: -16.7%
TheStreet Ratings: Hold, C

Southwestern Energy Company, an independent energy company, engages in the exploration, development, and production of natural gas and oil in the United States. The company operates in two segments, Exploration, Development and Production; and Midstream Services.

"We rate SOUTHWESTERN ENERGY CO (SWN) a HOLD. The primary factors that have impacted our rating are mixed ? some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company's strengths can be seen in multiple areas, such as its reasonable valuation levels, largely solid financial position with reasonable debt levels by most measures and expanding profit margins. However, as a counter to these strengths, we also find weaknesses including unimpressive growth in net income, disappointing return on equity and weak operating cash flow."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The debt-to-equity ratio is somewhat low, currently at 0.73, and is less than that of the industry average, implying that there has been a relatively successful effort in the management of debt levels. Despite the fact that SWN's debt-to-equity ratio is low, the quick ratio, which is currently 0.54, displays a potential problem in covering short-term cash needs.
  • 49.09% is the gross profit margin for SOUTHWESTERN ENERGY CO which we consider to be strong. Despite the high profit margin, it has decreased significantly from the same period last year. Despite the mixed results of the gross profit margin, SWN's net profit margin of 8.36% compares favorably to the industry average.
  • Current return on equity is lower than its ROE from the same quarter one year prior. This is a clear sign of weakness within the company. In comparison to the other companies in the Oil, Gas & Consumable Fuels industry and the overall market, SOUTHWESTERN ENERGY CO's return on equity is significantly below that of the industry average and is below that of the S&P 500.
  • The company, on the basis of change in net income from the same quarter one year ago, has significantly underperformed against the S&P 500 and did not exceed that of the Oil, Gas & Consumable Fuels industry. The net income has significantly decreased by 59.8% when compared to the same quarter one year ago, falling from $194.19 million to $78.00 million.

 

MUR ChartMUR data by YCharts
7. Murphy Oil Corporation (MUR - Get Report)

Market Cap: $7.4 billion
Year-to-date return: 17.7%
TheStreet Ratings: Hold, C

Murphy Oil Corporation operates as an oil and gas exploration and production company worldwide. It explores for and produces crude oil, natural gas, and natural gas liquids. The company was formerly known as Murphy Corporation and changed its name to Murphy Oil Corporation in 1964.

"We rate MURPHY OIL CORP (MUR) a HOLD. The primary factors that have impacted our rating are mixed ? some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company's strengths can be seen in multiple areas, such as its reasonable valuation levels, largely solid financial position with reasonable debt levels by most measures and expanding profit margins. However, as a counter to these strengths, we also find weaknesses including deteriorating net income, disappointing return on equity and weak operating cash flow."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The current debt-to-equity ratio, 0.32, is low and is below the industry average, implying that there has been successful management of debt levels. Although the company had a strong debt-to-equity ratio, its quick ratio of 0.87 is somewhat weak and could be cause for future problems.
  • The gross profit margin for MURPHY OIL CORP is rather high; currently it is at 66.20%. Despite the high profit margin, it has decreased significantly from the same period last year. Despite the mixed results of the gross profit margin, the net profit margin of -1.92% trails the industry average.
  • The company's current return on equity has slightly decreased from the same quarter one year prior. This implies a minor weakness in the organization. In comparison to the other companies in the Oil, Gas & Consumable Fuels industry and the overall market, MURPHY OIL CORP's return on equity is significantly below that of the industry average and is below that of the S&P 500.
  • The company, on the basis of change in net income from the same quarter one year ago, has significantly underperformed when compared to that of the S&P 500 and the Oil, Gas & Consumable Fuels industry. The net income has significantly decreased by 109.3% when compared to the same quarter one year ago, falling from $155.25 million to -$14.44 million.

 

OKE ChartOKE data by YCharts
6. ONEOK, Inc. (OKE - Get Report)

Market Cap: $8.2 billion
Year-to-date return: -20.7%
TheStreet Ratings: Hold, C

ONEOK, Inc. engages in the gathering, processing, storage, and transportation of natural gas in the United States. It operates in Natural Gas Gathering and Processing, Natural Gas Liquids, and Natural Gas Pipelines segments.

"We rate ONEOK INC (OKE) a HOLD. The primary factors that have impacted our rating are mixed ? some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. Among the primary strengths of the company is its respectable return on equity which we feel is likely to continue. At the same time, however, we also find weaknesses including a generally disappointing performance in the stock itself, generally higher debt management risk and weak operating cash flow."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The return on equity has improved slightly when compared to the same quarter one year prior. This can be construed as a modest strength in the organization. Compared to other companies in the Oil, Gas & Consumable Fuels industry and the overall market, ONEOK INC's return on equity significantly exceeds that of both the industry average and the S&P 500.
  • OKE, with its decline in revenue, slightly underperformed the industry average of 38.7%. Since the same quarter one year prior, revenues fell by 42.9%. Weakness in the company's revenue seems to have hurt the bottom line, decreasing earnings per share.
  • ONEOK INC's earnings per share declined by 34.1% in the most recent quarter compared to the same quarter a year ago. This company has reported somewhat volatile earnings recently. We feel it is likely to report a decline in earnings in the coming year. During the past fiscal year, ONEOK INC increased its bottom line by earning $1.53 versus $1.33 in the prior year. For the next year, the market is expecting a contraction of 4.6% in earnings ($1.46 versus $1.53).
  • Net operating cash flow has significantly decreased to $39.27 million or 91.99% when compared to the same quarter last year. In addition, when comparing the cash generation rate to the industry average, the firm's growth is significantly lower.
  • Despite any intermediate fluctuations, we have only bad news to report on this stock's performance over the last year: it has tumbled by 42.21%, worse than the S&P 500's performance. Consistent with the plunge in the stock price, the company's earnings per share are down 34.09% compared to the year-earlier quarter. Although its share price is down sharply from a year ago, do not assume that it can now be tagged as cheap and attractive. The reality is that, based on its current price in relation to its earnings, OKE is still more expensive than most of the other companies in its industry.

 

ESV ChartESV data by YCharts
5. Ensco plc (ESV - Get Report)

Market Cap: $5.2 billion
Year-to-date return: -25.6%
TheStreet Ratings: Sell, D

Ensco plc provides offshore contract drilling services to the oil and gas industry worldwide. The company operates through three segments: Floaters, Jackups, and Other.

"We rate ENSCO PLC (ESV) a SELL. This is driven by a few notable weaknesses, which we believe should have a greater impact than any strengths, and could make it more difficult for investors to achieve positive results compared to most of the stocks we cover. The company's weaknesses can be seen in multiple areas, such as its disappointing return on equity and generally disappointing historical performance in the stock itself."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • Return on equity has greatly decreased when compared to its ROE from the same quarter one year prior. This is a signal of major weakness within the corporation. Compared to other companies in the Energy Equipment & Services industry and the overall market, ENSCO PLC's return on equity significantly trails that of both the industry average and the S&P 500.
  • ESV's stock share price has done very poorly compared to where it was a year ago: Despite any rallies, the net result is that it is down by 60.40%, which is also worse that the performance of the S&P 500 Index. Investors have so far failed to pay much attention to the earnings improvements the company has managed to achieve over the last quarter. Naturally, the overall market trend is bound to be a significant factor. However, in one sense, the stock's sharp decline last year is a positive for future investors, making it cheaper (in proportion to its earnings over the past year) than most other stocks in its industry. But due to other concerns, we feel the stock is still not a good buy right now.
  • ENSCO PLC has improved earnings per share by 9.5% in the most recent quarter compared to the same quarter a year ago. This company has reported somewhat volatile earnings recently. But, we feel it is poised for EPS growth in the coming year. During the past fiscal year, ENSCO PLC swung to a loss, reporting -$11.70 versus $6.08 in the prior year. This year, the market expects an improvement in earnings ($3.90 versus -$11.70).
  • ESV's debt-to-equity ratio of 0.72 is somewhat low overall, but it is high when compared to the industry average, implying that the management of the debt levels should be evaluated further. Despite the fact that ESV's debt-to-equity ratio is mixed in its results, the company's quick ratio of 2.14 is high and demonstrates strong liquidity.
  • Net operating cash flow has increased to $459.00 million or 10.17% when compared to the same quarter last year. Despite an increase in cash flow, ENSCO PLC's average is still marginally south of the industry average growth rate of 12.07%.

 

NOV ChartNOV data by YCharts
4. National Oilwell Varco, Inc. (NOV - Get Report)

Market Cap: $18.7 billion
Year-to-date return: -26.3%
TheStreet Ratings: Hold, C

National Oilwell Varco, Inc. designs, manufactures, and sells equipment and components used in oil and gas drilling, completion, and production; and provides oilfield services to the upstream oil and gas industry worldwide.

"We rate NATIONAL OILWELL VARCO INC (NOV) a HOLD. The primary factors that have impacted our rating are mixed ? some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company's strengths can be seen in multiple areas, such as its largely solid financial position with reasonable debt levels by most measures, reasonable valuation levels and notable return on equity. However, as a counter to these strengths, we also find weaknesses including weak operating cash flow, poor profit margins and deteriorating net income."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • NOV's debt-to-equity ratio is very low at 0.22 and is currently below that of the industry average, implying that there has been very successful management of debt levels. Along with the favorable debt-to-equity ratio, the company maintains an adequate quick ratio of 1.06, which illustrates the ability to avoid short-term cash problems.
  • Regardless of the drop in revenue, the company managed to outperform against the industry average of 1.9%. Since the same quarter one year prior, revenues slightly dropped by 1.4%. Weakness in the company's revenue seems to have hurt the bottom line, decreasing earnings per share.
  • The gross profit margin for NATIONAL OILWELL VARCO INC is currently lower than what is desirable, coming in at 28.36%. It has decreased from the same quarter the previous year. Regardless of the weak results of the gross profit margin, the net profit margin of 6.43% is above that of the industry average.
  • Net operating cash flow has significantly decreased to $114.00 million or 76.63% when compared to the same quarter last year. In addition, when comparing to the industry average, the firm's growth rate is much lower.

 

DO ChartDO data by YCharts
3. Diamond Offshore Drilling, Inc. (DO - Get Report)

Market Cap: $3.5 billion
Year-to-date return: -29.7%
TheStreet Ratings: Hold, C-

Diamond Offshore Drilling, Inc. provides contract drilling services to the energy industry worldwide. The company provides services in floater market, such as ultra-deepwater, deepwater, and mid-water; and non-floater or jack-up market.

"We rate DIAMOND OFFSHRE DRILLING INC (DO) a HOLD. The primary factors that have impacted our rating are mixed ? some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company's strengths can be seen in multiple areas, such as its largely solid financial position with reasonable debt levels by most measures and expanding profit margins. However, as a counter to these strengths, we also find weaknesses including feeble growth in the company's earnings per share, deteriorating net income and disappointing return on equity."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The current debt-to-equity ratio, 0.54, is low and is below the industry average, implying that there has been successful management of debt levels. Although the company had a strong debt-to-equity ratio, its quick ratio of 0.84 is somewhat weak and could be cause for future problems.
  • 40.21% is the gross profit margin for DIAMOND OFFSHRE DRILLING INC which we consider to be strong. Regardless of DO's high profit margin, it has managed to decrease from the same period last year. Despite the mixed results of the gross profit margin, DO's net profit margin of -41.23% significantly underperformed when compared to the industry average.
  • Return on equity has greatly decreased when compared to its ROE from the same quarter one year prior. This is a signal of major weakness within the corporation. Compared to other companies in the Energy Equipment & Services industry and the overall market, DIAMOND OFFSHRE DRILLING INC's return on equity significantly trails that of both the industry average and the S&P 500.
  • Net operating cash flow has decreased to $160.57 million or 47.01% when compared to the same quarter last year. In addition, when comparing to the industry average, the firm's growth rate is much lower.

 

CNX ChartCNX data by YCharts
2. CONSOL Energy Inc. (CNX - Get Report)

Market Cap: $5 billion
Year-to-date return: -35.7%
TheStreet Ratings: Hold, C

CONSOL Energy Inc., together with its subsidiaries, operates as an integrated energy company in the United States and internationally. The company operates through two divisions, Exploration and Production (E&P), and Coal.

"We rate CONSOL ENERGY INC (CNX) a HOLD. The primary factors that have impacted our rating are mixed ? some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. Among the primary strengths of the company is its solid financial position based on a variety of debt and liquidity measures that we have evaluated. At the same time, however, we also find weaknesses including a generally disappointing performance in the stock itself, disappointing return on equity and deteriorating net income."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • CONSOL ENERGY INC's earnings per share declined by 35.8% in the most recent quarter compared to the same quarter a year ago. This company has reported somewhat volatile earnings recently. But, we feel it is poised for EPS growth in the coming year. During the past fiscal year, CONSOL ENERGY INC increased its bottom line by earning $0.73 versus $0.35 in the prior year. This year, the market expects an improvement in earnings ($0.78 versus $0.73).
  • The debt-to-equity ratio is somewhat low, currently at 0.64, and is less than that of the industry average, implying that there has been a relatively successful effort in the management of debt levels. Even though the company has a strong debt-to-equity ratio, the quick ratio of 0.29 is very weak and demonstrates a lack of ability to pay short-term obligations.
  • Despite the weak revenue results, CNX has significantly outperformed against the industry average of 38.7%. Since the same quarter one year prior, revenues slightly dropped by 8.0%. Weakness in the company's revenue seems to have hurt the bottom line, decreasing earnings per share.
  • Despite any intermediate fluctuations, we have only bad news to report on this stock's performance over the last year: it has tumbled by 50.80%, worse than the S&P 500's performance. Consistent with the plunge in the stock price, the company's earnings per share are down 35.84% compared to the year-earlier quarter. Although its share price is down sharply from a year ago, do not assume that it can now be tagged as cheap and attractive. The reality is that, based on its current price in relation to its earnings, CNX is still more expensive than most of the other companies in its industry.
  • The company's current return on equity has slightly decreased from the same quarter one year prior. This implies a minor weakness in the organization. Compared to other companies in the Oil, Gas & Consumable Fuels industry and the overall market, CONSOL ENERGY INC's return on equity significantly trails that of both the industry average and the S&P 500.

 

CHK ChartCHK data by YCharts
1. Chesapeake Energy Corporation (CHK - Get Report)

Market Cap: $7.4 billion
Year-to-date return: -43%
TheStreet Ratings: Sell, D

Chesapeake Energy Corporation engages in the acquisition, exploration, and development of properties for the production of oil, natural gas and natural gas liquids (NGL) from underground reservoirs in the United States.

"We rate CHESAPEAKE ENERGY CORP (CHK) a SELL. This is driven by a number of negative factors, which we believe should have a greater impact than any strengths, and could make it more difficult for investors to achieve positive results compared to most of the stocks we cover. The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, disappointing return on equity, weak operating cash flow, generally disappointing historical performance in the stock itself and feeble growth in its earnings per share."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The company, on the basis of change in net income from the same quarter one year ago, has significantly underperformed when compared to that of the S&P 500 and the Oil, Gas & Consumable Fuels industry. The net income has significantly decreased by 979.8% when compared to the same quarter one year ago, falling from $425.00 million to -$3,739.00 million.
  • Return on equity has greatly decreased when compared to its ROE from the same quarter one year prior. This is a signal of major weakness within the corporation. Compared to other companies in the Oil, Gas & Consumable Fuels industry and the overall market, CHESAPEAKE ENERGY CORP's return on equity significantly trails that of both the industry average and the S&P 500.
  • Net operating cash flow has significantly decreased to $423.00 million or 67.23% when compared to the same quarter last year. In addition, when comparing the cash generation rate to the industry average, the firm's growth is significantly lower.
  • Despite any intermediate fluctuations, we have only bad news to report on this stock's performance over the last year: it has tumbled by 62.14%, worse than the S&P 500's performance. Consistent with the plunge in the stock price, the company's earnings per share are down 1159.25% compared to the year-earlier quarter. Naturally, the overall market trend is bound to be a significant factor. However, in one sense, the stock's sharp decline last year is a positive for future investors, making it cheaper (in proportion to its earnings over the past year) than most other stocks in its industry. But due to other concerns, we feel the stock is still not a good buy right now.
  • CHESAPEAKE ENERGY CORP has experienced a steep decline in earnings per share in the most recent quarter in comparison to its performance from the same quarter a year ago. This company has reported somewhat volatile earnings recently. We feel it is likely to report a decline in earnings in the coming year. During the past fiscal year, CHESAPEAKE ENERGY CORP increased its bottom line by earning $1.83 versus $0.68 in the prior year. For the next year, the market is expecting a contraction of 109.8% in earnings (-$0.18 versus $1.83).