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Questar Net Income Up 54% in Second Quarter 2008

July 28, 2008

Questar Corp. (NYSE:STR) net income grew 54% in the second quarter of 2008 to $172.6 million, or $0.98 per diluted share compared to $112.2 million, or $0.64 per diluted share, for the second quarter of 2007. For the first half of 2008, Questar net income was $358.4 million, or $2.03 per diluted share, compared to $263.3 million or $1.50 per diluted share for the 2007 period, a 36% increase.

 NET INCOME (LOSS) BY SUBSIDIARY (in millions, except earnings per share)  3 Months Ended         6 Months Ended June 30,               June 30, 2008    2007   Change  2008    2007  Change ——- ——- —— ——- —— —— Market Resources Questar E&P             $116.8   $66.7     75% $213.3  $143.9    48% Wexpro                    18.8    14.7     28    35.0    28.6    22 Gas Management            21.7    14.9     46    40.2    27.3    47 Energy Trading and other                     4.8     5.8    (17)   12.9    11.8     9 ——- ——-        ——- —— Market Resources Total     162.1   102.1     59   301.4   211.6    42  Questar Pipeline            12.7    10.0     27    28.6    21.2    35 Questar Gas                 (2.0)   (1.1)   (82)   28.6    28.0     2 Corporate                   (0.2)    1.2           (0.2)    2.5 ——- ——-        ——- —— QUESTAR CORPORATION TOTAL $172.6  $112.2     54% $358.4  $263.3    36% ======= =======        ======= ======  Earnings per diluted share                     $0.98   $0.64          $2.03   $1.50 Average diluted shares     176.3   175.9          176.3   175.7 

“All Questar business units posted record net income in the first half of 2008,” said Keith O. Rattie, Questar Chairman, President and CEO. “Questar E&P grew natural gas and oil-equivalent production 14% in the first half, driven by a 27% increase in Midcontinent production.”

Second Quarter 2008 Highlights

— Questar E&P grew natural gas, oil and natural gas liquids (NGL) production 14% to 40.6 billion cubic feet of natural gas equivalent (Bcfe) compared to 35.5 Bcfe for the 2007 period. Natural gas comprised 88% of reported production volumes.

— Average realized natural gas prices at Questar E&P increased $1.49 per thousand cubic feet (Mcf), or 23%, and average realized crude oil and NGL prices increased $28.93 per barrel (bbl), or 57%. Natural gas hedges decreased reported revenues by $44.0 million, while oil hedges decreased revenues by $15.7 million.

— Net mark-to-market gains on natural gas basis-only hedges increased net income $10.1 million in the 2008 quarter compared to a loss of $4.1 million in the year-earlier period.

— Wexpro grew its investment base 30% to $346.4 million at June 30, 2008. Wexpro produced 10.9 Bcf of cost-of-service gas for delivery to affiliate Questar Gas compared to 10.2 Bcf in the 2007 quarter.

— Gas Management net income grew 46%, driven by higher gathering and processing margins. Net processing revenues increased 40% to $24.0 million due to a 29% increase in fee-based processing volumes and higher keep-whole processing margins.

— Energy Trading net income decreased 17% to $4.8 million as a result of reduced trading margins caused by narrower regional basis differentials and lower overall commodity-price volatility compared to the 2007 period. Gross marketing margin totaled $7.1 million compared to $9.3 million in the year-ago period.

— Questar Pipeline grew net income 27% over the prior-year period, to $12.7 million, driven by higher transportation revenues from expansion projects completed in the fourth-quarter of 2007. One-time items combined to reduce net income $2.1 million after-tax in the quarter.

— Questar Gas seasonal loss increased to $2.0 million. Higher operating and maintenance expense more than offset increased gross margin in the quarter.

— Questar earned a 16.7% return on assets (ROA – defined as earnings before interest and income taxes divided by average total assets) for the trailing 12-month period ended June 30, 2008. Market Resources ROA was 20.2%; Questar Pipeline ROA was 9.9%; and Questar Gas ROA was 7.9%.

Questar Raises 2008 Net Income Guidance

Questar now expects full-year 2008 net income to range from $3.50 to $3.60 per diluted share compared to previous guidance of $3.25 to $3.40 per diluted share. The company’s revised guidance now assumes that the NYMEX/Rockies basis differential will range from $3.50 to $4.50 per MMBtu for the remainder of 2008, compared to $2.50 to $3.00 per MMBtu assumed in previous guidance. The guidance assumes the NYMEX natural gas price will range from $10.00 to $11.00 per MMBtu for currently unhedged 2008 production for the rest of the year, and the prompt-month NYMEX crude oil price will range from $120.00 to $130.00 per bbl for unhedged volumes. The company’s guidance also excludes one-time items and assumes hedges in place on the date of this release. These and other assumptions are summarized in the table below:

 Guidance Assumptions  2008            2008 Current        Previous ————— ————— Earnings per diluted share                 $3.50-$3.60     $3.25-$3.40 Average diluted shares (millions)                177.1           176.2 Questar E&P production – Bcfe                  166-169         166-169 Pinedale well completions                        73-78           70-75 NYMEX gas price per MMBtu(a)             $10.00-$11.00   $10.00-$11.00 NYMEX crude oil price per bbl(a)       $120.00-$130.00 $105.00-$115.00 NYMEX/Rockies basis differential per MMBtu(a)                                  $4.50-$3.50     $3.00-$2.50 NYMEX/Midcontinent basis differential per MMBtu(a)                              $3.00-$2.00     $1.60-$1.35  (a) On unhedged volumes for the remainder of 2008 

— Questar E&P has hedged about 79% of forecast natural gas and oil-equivalent production for the remainder of 2008 with fixed-price swaps. Additionally, the company has hedged about 2% of forecast remainder of 2008 production with natural gas basis-only swaps (see table at the end of this release).

— The company estimates that a $1.00 per MMBtu change in the average NYMEX price of natural gas for the remainder of 2008 would result in about a $0.02 change in earnings per diluted share.

— The company also estimates that a $10.00 per barrel change in the average NYMEX price of oil for the remainder of 2008 would result in about a $0.03 change in earnings per diluted share.

Questar E&P Net Income Increases 75% in Second Quarter, 48% for First Half of 2008

Questar E&P – a Market Resources subsidiary that acquires, explores for, develops and produces natural gas and oil – reported production of 40.6 Bcfe in the second quarter of 2008 compared to 35.5 Bcfe in the 2007 period, a 14% increase. Higher realized natural gas, crude oil and NGL prices and growing production more than offset a 25% increase in average production costs (primarily due to higher production tax and interest expense as detailed in the production cost table). Net mark-to-market gains on natural gas basis-only swaps increased net income $10.1 million in the 2008 quarter compared to a $ 4.1 million loss in the 2007 quarter. For the first half of 2008, Questar E&P net income rose 48% to $213.3 million compared to $143.9 million a year earlier, driven by a 14% increase in production, higher realized prices and increased net mark-to-market gains on NYMEX/Rockies natural gas basis swaps.

 Questar E&P – Production by Region  3 Months Ended   6 Months Ended June 30,         June 30, 2008 2007 Change 2008 2007 Change —- —- —— —- —- —— (Bcfe)           (Bcfe) Pinedale Anticline                   12.5 11.5     9% 25.8 23.6     9% Uinta Basin                           6.1  6.6    (8) 12.8 12.6     2 Rockies Legacy                        5.0  4.9     2   9.9  9.4     5 —- —-        —- —- Subtotal – Rocky Mountains      23.6 23.0     3  48.5 45.6     6 Midcontinent                         17.0 12.5    36  31.6 24.8    27 —- —-        —- —- Total Questar E&P               40.6 35.5    14% 80.1 70.4    14% ==== ====        ==== ==== 

 Questar E&P – Realized Prices and Hedging Impact  3 Months Ended         6 Months Ended June 30,               June 30, 2008    2007   Change  2008    2007   Change ——- ——- —— ——- ——- ——  Realized natural gas price ($ per Mcf)        $7.94   $6.45     23%  $7.43   $6.39     16% Natural gas hedging impact ($ per Mcf)       (1.23)   1.94          (0.53)   1.46  Realized oil and NGL price ($ per bbl)       $79.48  $50.55     57% $76.85  $49.63     55% Oil and NGL hedging impact ($ per bbl)      (19.68)  (2.13)        (14.55)  (0.52)  Net mark-to-market gains (losses) on natural gas basis-only swaps ($ millions) Pre-tax                   $16.3   ($6.6)         $30.0    $5.2 After-tax                 $10.1   ($4.1)         $18.6    $3.3 

Questar may enter into derivative transactions on up to 100% of forecast production from proved reserves to lock in acceptable returns on invested capital and to protect cash flow and net income from a decline in commodity prices. The company uses natural gas basis-only swaps to protect cash flows and net income from widening natural gas-price basis differentials that may result from capacity constraints on regional gas pipelines.

Questar E&P production costs (the sum of depreciation, depletion and amortization expense, lease operating expense, general and administrative expense, allocated interest expense, and production taxes) per unit of gas-equivalent production increased 25% compared to the 2007 second quarter due primarily to increased production taxes and higher allocated interest expense.

 Questar E&P – Production Costs  3 Months        6 Months Ended Ended June 30,        June 30, (per Mcfe)         (per Mcfe) 2008  2007 Change  2008  2007 Change —– —– —— —– —– —— Depreciation, depletion and amortization                    $1.88 $1.71    10% $1.85 $1.70     9% Lease operating expense           0.74  0.62    19   0.73  0.61    20 General and administrative expense                          0.40  0.44    (9)  0.38  0.40    (5) Allocated interest expense        0.40  0.18   122   0.33  0.18    83 Production taxes                  0.79  0.41    93   0.73  0.43    70 —– —–        —– —– Production costs            $4.21 $3.36    25% $4.02 $3.32    21% ===== =====        ===== ===== 

— Production volume-weighted average depreciation, depletion and amortization per Mcfe (the DD&A rate) increased due to higher costs for drilling, completion and related services, increased cost of steel casing, other tubulars and wellhead equipment. The DD&A rate also increased due to the ongoing depletion of older, lower-cost reserves and the increasing component of Questar E&P production derived from recently acquired, higher-cost fields in the Midcontinent.

— Lease operating expense per Mcfe increased due to higher costs of materials and consumables, increased produced-water disposal costs and increased well-workover activity.

— General and administrative expense per Mcfe decreased as production growth outstripped increases in expenses.

— Allocated interest expense per unit of production increased primarily due to financing costs related to the first quarter 2008 acquisition of significant natural gas development properties in northwest Louisiana.

— Production taxes per Mcfe were higher due to higher natural gas and oil sales prices in the 2008 period. Production taxes are based on a percentage of sales prices, before the impact of hedges.

Wexpro Net Income Up 28% in Second Quarter, 22% for First Half of 2008

Wexpro – a Market Resources subsidiary that develops and produces cost-of-service reserves for affiliate Questar Gas – reported net income of $18.8 million compared to $14.7 million in the prior-year period, a 28% increase. Wexpro results benefited from a higher average investment base compared to the prior-year period. Wexpro investment base at June 30, 2008, was $346.4 million compared to $267.2 million a year ago, a 30% increase. For the first half of 2008, Wexpro net income was $35.0 million compared to $28.6 million for the prior-year period, a 22% increase, primarily due to a higher investment base.

Under a long-standing agreement with the states of Utah and Wyoming, Wexpro recovers its costs and earns an unlevered after-tax return of about 19 to 20% on its investment base – the investment in commercial wells and related facilities, adjusted for working capital and reduced for deferred income taxes and accumulated depreciation.

Gas Management Net Income Up 46% in Second Quarter, 47% for the First Half of 2008

Questar Gas Management (Gas Management) – Market Resources’ gas-gathering and processing-services business – reported net income of $21.7 million compared to $14.9 million in the prior-year period, a 46% increase, driven by higher gathering and processing margins. Net processing revenues increased 40% to $24.0 million due to increased processing volumes and a higher frac spread. Gas Management grew fee-based gas-processing volumes 29% in the second quarter to 43.2 million MMBtu. Fee-based gas-processing revenues grew 31% compared to the year-ago quarter, while the frac-spread for keep-whole processing increased 44% or $5.2 million. Approximately 72% of Gas Management net operating revenue (total revenue less processing plant-shrink) was derived from fee-based contracts compared to 74% in the 2007 period. For the first half of 2008, Gas Management net income increased 47% to $40.2 million compared to $27.3 million in the 2007 period, driven by higher gathering and processing margins.

Questar Pipeline Net Income Up 27% in Second Quarter, 35% for First Half of 2008

Questar Pipeline – which provides interstate natural gas transportation and storage services – reported net income of $12.7 million compared to $10.0 million in the prior-year period, a 27% increase, primarily from system expansions placed in service late in 2007. Revenues increased $12.3 million or 25%, driven by higher transportation services, while operating, maintenance, general and administrative expenses increased $1.2 million or 7% due to additional operating costs for new transportation and gas processing facilities. One-time items combined to reduce net income $2.1 million after-tax in the quarter. A $6.8 million after-tax loss on the impairment of investment in an underground gas storage project was partially offset by a $2.4 million after-tax gain on the sale of a non-core asset and a $2.3 million after-tax gain on collection of a note receivable. Questar Pipeline net income was $28.6 million in the first half of 2008 compared to $21.2 million in the year-ago period. Net income rose primarily from system expansions placed in service late in 2007.

Questar Gas Seasonal Net Loss of $2.0 Million in Second Quarter, Net Income Up 2% for First Half of 2008

Questar Gas – which provides retail natural gas distribution services in Utah, Wyoming and Idaho – reported a $2.0 million net loss in the quarter, a $0.9 million increase in its seasonal net loss over the year-ago period. Higher operating and maintenance expenses, primarily bad debt costs, more than offset an increase in gross margin.

Questar Gas net income was $28.6 million in the first half of 2008, 2% higher than the year-earlier period, primarily as a result of customer growth. Operating, maintenance, general and administrative expenses totaled $71 per customer in the first half of 2008 compared to $69 per customer in the 2007 period. At June 30, 2008, Questar Gas served 881,500 customers, up 19,400 or 2.3% from June 30, 2007.

Second Quarter 2008 Earnings Teleconference

Questar management will discuss second quarter 2008 results and the outlook for the remainder of 2008 in a conference call with investors Tuesday, July 29, beginning at 9:30 a.m. EDT. The call can be accessed on the company Internet site at www.questar.com.

About Questar

Questar Corp. (NYSE:STR) is a natural gas-focused energy company with an enterprise value of about $12 billion. Questar finds, develops, produces, gathers, processes, transports, stores and distributes natural gas.

Forward-Looking Statements

This release includes forward-looking statements within the meaning of Section 27(a) of the Securities Act of 1933, as amended, and Section 21(e) of the Securities Exchange Act of 1934, as amended. Such statements are based on management’s current expectations, estimates and projections, which are subject to a wide range of uncertainties and business risks. Factors that could cause actual results to differ from those anticipated are discussed in the company’s periodic filings with the Securities and Exchange Commission, including its annual report on Form 10-K for the year ended December 31, 2007. Questar undertakes no obligation to publicly correct or update the forward-looking statements in this news release, in other documents, or on the Web site to reflect future events or circumstances. All such statements are expressly qualified by this cautionary statement.

For more information, visit Questar’s Internet site at: www.questar.com.

 Hedge Positions – July 28, 2008  Time       Rocky                         Rocky Periods  Mountains Midcontinent Total  Mountains Midcontinent  Total ———————————————————————- Estimated Average price per Mcf, net to Gas (Bcf) fixed-price swaps              the well 2008 Second half           40.2         26.3  66.5      $7.06        $8.32  $7.56  2009 First half      32.7         29.5  62.2      $7.24        $8.12  $7.66 Second half           33.3         30.0  63.3       7.24         8.12   7.66 —————————- 66.0         59.5 125.5       7.24         8.12   7.66  2010 First half       6.7         26.2  32.9      $6.88        $8.09  $7.84 Second half            6.8         26.6  33.4       6.88         8.09   7.84 —————————- 12 months       13.5         52.8  66.3       6.88         8.09   7.84   Estimated Average basis per Mcf vs. Gas (Bcf) basis-only swaps               NYMEX  2008 Second half            1.7                1.7      $1.83               $1.83  2009 First half      11.0          1.7  12.7      $2.68        $1.08  $2.47 Second half           11.2          1.7  12.9       2.68         1.08   2.47 —————————- 12 months       22.2          3.4  25.6       2.68         1.08   2.47  2010 First half      30.2          1.7  31.9      $3.39        $0.94  $3.27 Second half           30.7          1.7  32.4       3.39         0.94   3.27 —————————- 12 months       60.9          3.4  64.3       3.39         0.94   3.27  2011 First half      45.3               45.3      $2.29               $2.29 Second half           46.1               46.1       2.29                2.29 —————————- 12 months       91.4               91.4       2.29                2.29   Hedge Positions – July 28, 2008 Time         Rocky                         Rocky Periods   Mountains Midcontinent Total  Mountain  Midcontinent Total ———————————————————————- Estimated Average price per Bbl, net to Oil (Mbbl) fixed-price swaps             the well  2008 Second half            423          221   644     $67.39       $70.77 $68.55  2009 First half       217          145   362     $60.55       $66.55 $62.95 Second half            221          147   368      60.55        66.55  62.95 ——— ———— —– 12 months        438          292   730      60.55        66.55  62.95 

 QUESTAR CORPORATION CONSOLIDATED STATEMENTS OF INCOME (Unaudited)  3 Months Ended      6 Months Ended June 30,            June 30, 2008     2007       2008     2007 ————————————- (in millions, except per share amounts) REVENUES Market Resources                $654.4   $384.6   $1,264.6   $818.5 Questar Pipeline                  43.3     30.4       88.0     62.1 Questar Gas                      159.5    141.7      549.7    548.2 ————————————- Total Revenues                 857.2    556.7    1,902.3  1,428.8  OPERATING EXPENSES Cost of natural gas and other products sold (excluding operating expenses shown separately)                     258.0    119.6      706.6    512.0 Operating and maintenance         92.1     72.7      181.8    150.4 General and administrative        43.5     42.1       84.0     79.3 Production and other taxes        49.3     27.2       90.1     57.0 Depreciation, depletion and amortization                    115.2     92.6      225.9    183.7 Exploration                        3.8      3.1        7.3      5.1 Abandonment and impairment        14.2      2.1       16.8      4.1 ————————————- Total Operating Expenses       576.1    359.4    1,312.5    991.6 Net gain from asset sales            3.5      0.1        3.4      0.5 ————————————- Operating Income               284.6    197.4      593.2    437.7 Interest and other income            8.3      2.9       10.3      5.9 Minority interest                   (2.1)               (4.5) Income from unconsolidated affiliates                          0.2      2.2        0.4      4.4 Net mark-to-market gain (loss) on basis-only swaps                16.3     (6.6)      30.0      5.2 Interest expense                   (32.5)   (17.7)     (58.1)   (35.7) ————————————- Income Before Income Taxes     274.8    178.2      571.3    417.5 Income taxes                       102.2     66.0      212.9    154.2 ————————————- Net Income            $172.6   $112.2     $358.4   $263.3 =====================================  EARNINGS PER COMMON SHARE Basic                          $1.00    $0.65      $2.08    $1.53 Diluted                         0.98     0.64       2.03     1.50 Weighted-Average Common Shares Outstanding Basic                          172.7    172.0      172.6    171.8 Diluted                        176.3    175.9      176.3    175.7 Dividends Per Common Share       $0.1225  $0.1225     $0.245    $0.24 

 QUESTAR CORPORATION OPERATIONS BY LINE OF BUSINESS (Unaudited) 3 Months Ended    6 Months Ended June 30,          June 30, 2008    2007      2008      2007 ———————————– (in millions) Revenues from Unaffiliated Customers Questar E&P                     $349.4  $239.0     $649.1    $468.8 Wexpro                             8.5     4.9       16.8      11.4 Gas Management                    72.2    49.4      135.3      93.4 Energy Trading and other         224.3    91.3      463.4     244.9 ———————————– Market Resources total       654.4   384.6    1,264.6     818.5 Questar Pipeline                  43.3    30.4       88.0      62.1 Questar Gas                      159.5   141.7      549.7     548.2 ——- ——– ——— ——– $857.2  $556.7   $1,902.3  $1,428.8 ===================================  Revenues from Affiliated Companies Wexpro                           $52.3   $42.1      $98.7     $82.8 Gas Management                     5.5     4.1       11.3       8.4 Energy Trading and other         226.4   133.3      408.1     289.3 ———————————– Market Resources total       284.2   179.5      518.1     380.5 Questar Pipeline                  18.7    19.3       38.2      39.9 Questar Gas                        2.3     2.1        4.3       3.2 ———————————– $305.2  $200.9     $560.6    $423.6 ===================================  Operating Income Questar E&P                     $186.8  $119.9     $338.8    $237.0 Wexpro                            28.2    22.5       53.6      43.9 Gas Management                    37.8    22.8       70.9      41.6 Energy Trading and other           7.1     7.9       19.3      16.1 ———————————– Market Resources total       259.9   173.1      482.6     338.6 Questar Pipeline                  23.6    21.4       56.1      45.2 Questar Gas                        1.1     1.9       54.5      52.8 Corporate                                  1.0                  1.1 ———————————– $284.6  $197.4     $593.2    $437.7 ===================================  Net Income (Loss) Questar E&P                     $116.8   $66.7     $213.3    $143.9 Wexpro                            18.8    14.7       35.0      28.6 Gas Management                    21.7    14.9       40.2      27.3 Energy Trading and other           4.8     5.8       12.9      11.8 ———————————– Market Resources total       162.1   102.1      301.4     211.6 Questar Pipeline                  12.7    10.0       28.6      21.2 Questar Gas                       (2.0)   (1.1)      28.6      28.0 Corporate                         (0.2)    1.2       (0.2)      2.5 ———————————– $172.6  $112.2     $358.4    $263.3 =================================== 

 QUESTAR CORPORATION SELECTED OPERATING STATISTICS (Unaudited) 3 Months Ended   6 Months Ended June 30,         June 30, 2008     2007     2008    2007 ——————————– MARKET RESOURCES Questar E&P production volumes Natural gas (Bcf)                   35.8    30.9      70.6    61.8 Oil and natural gas liquids (MMbbl)                             0.8     0.7       1.6     1.4 Total production (Bcfe)             40.6    35.5      80.1    70.4 Average daily production (MMcfe)   446.4   389.9     440.1   389.1 Questar E&P average realized price, net to the well (including hedges) Natural gas (per Mcf)              $7.94   $6.45     $7.43   $6.39 Oil and NGL (per bbl)             $79.48  $50.55    $76.85  $49.63 Wexpro investment base at June 30, net of depreciation and deferred income taxes (millions)            $346.4  $267.2 Natural gas processing volumes NGL sales (MMgal)                  24.8    20.2      46.2    38.0 NGL sales price (per gal)         $1.41   $0.95     $1.32   $0.92 Fee-based processing (millions of MMBtu) (1) For unaffiliated customers         17.7    12.1      42.4    20.7 For affiliated customers           25.5    21.3      51.0    43.3 ——————————– Total fee-based processing volumes      43.2    33.4      93.4    64.0 ================================ Fee-based processing (per MMBtu)       $0.15   $0.15     $0.14   $0.15 Natural gas gathering volumes (millions of MMBtu) (1) For unaffiliated customers          54.7    44.3     106.0    83.9 For affiliated customers            38.0    31.4      75.3    68.9 ——————————– Total gathering                   92.7    75.7     181.3   152.8 ================================ Gathering revenue (per MMBtu) (1)  $0.31   $0.32     $0.31   $0.31 Natural gas and oil marketing volumes (MMdthe) For unaffiliated customers          20.0    24.4      46.5    50.0 For affiliated customers            25.4    23.6      52.5    50.9 ——————————– Total marketing                   45.4    48.0      99.0   100.9 ================================ QUESTAR PIPELINE Natural gas transportation volumes (MMdth) For unaffiliated customers       157.7    84.0     287.5   160.9 For Questar Gas                   30.1    25.4      73.3    67.5 For other affiliated customers     1.5     3.9       2.4     8.6 ——————————– Total transportation           189.3   113.3     363.2   237.0 ================================ Transportation revenue (per dth)   $0.23   $0.28     $0.24   $0.26 Firm-daily transportation demand at June 30, (Mdth)                3,124   2,240 Natural gas processing NGL sales (MMgal)                   1.5     1.4       4.0     3.9 NGL sales price (per gal)         $2.24   $1.20     $1.85   $1.05 QUESTAR GAS Natural gas volumes (MMdth) Residential and commercial          19.2    15.1      69.1    61.0 ——————————– Industrial                           0.5     0.4       0.9     0.8 Transportation for industrial customers                          13.4    11.0      29.4    20.9 ——————————– Total industrial                  13.9    11.4      30.3    21.7 ——————————– Total deliveries                  33.1    26.5      99.4    82.7 ================================ Natural gas revenue (per dth) Residential and commercial sales   $7.41   $8.51     $7.50   $8.53 Industrial                          6.92    5.88      6.75    6.39 Transportation for industrial customers                         $0.16   $0.21     $0.15   $0.22 Temperatures – warmer (colder) than                           normal normal                                 31%    (16%)      16% Temperature-adjusted usage per customer (dth)                       16.4    16.8      65.6    65.4 Customers at June 30, (thousands)    881.5   862.1 (1) one MMBtu = one dth 

 QUESTAR CORPORATION PRELIMINARY CONDENSED CONSOLIDATED BALANCE SHEETS  June 30,    December 2008         31, (Unaudited)    2007 ———————- (in millions) ASSETS Current Assets Cash and cash equivalents                                     $14.2 Accounts receivable, net                          $421.7      417.8 Fair value of derivative contracts                   4.2       78.1 Inventories                                        115.7      115.0 Prepaid expenses and other                          42.9       33.8 Purchased-gas adjustment                            12.0 Deferred income taxes – current                    194.5 ———————- Total Current Assets                             791.0      658.9 ———————- Property, Plant and Equipment                      9,172.2    7,741.9 Accumulated depreciation, depletion and amortization                                     (2,847.7)  (2,643.3) ———————- Net Property, Plant and Equipment               6,324.5    5,098.6 ———————- Investment in unconsolidated affiliates               27.3       52.8 Goodwill                                              70.7       70.7 Fair value of derivative contracts                                7.8 Other noncurrent assets, net                          84.7       55.4 ———————- Total Assets                                   $7,298.2   $5,944.2 ======================  LIABILITIES AND SHAREHOLDERS’ EQUITY Current Liabilities Checks outstanding in excess of cash balances                                          $14.4 Short-term debt                                    151.1     $260.6 Accounts payable and accrued expenses              545.8      564.5 Fair value of derivative contracts                 457.6        9.3 Purchased-gas adjustment                                       58.1 Deferred income taxes – current                                 4.9 Current portion of long-term debt                   58.3      101.3 ———————- Total Current Liabilities                      1,227.2      998.7 ———————- Long-term debt, less current portion               1,920.9    1,021.2 Deferred income taxes                                998.6      942.4 Fair value of derivative contracts                   275.2       22.1 Other long-term liabilities                          447.9      381.9 Minority interest                                     29.4 Common Shareholders’ Equity                        2,399.0    2,577.9 ———————- Total Liabilities and Common Shareholders’ Equity                                        $7,298.2   $5,944.2 ====================== 

 QUESTAR CORPORATION PRELIMINARY CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)  6 Months Ended June 30, 2008      2007 ——————- (in millions) OPERATING ACTIVITIES Net income                                       $   358.4  $ 263.3 Adjustments to reconcile net income to net cash provided from operating activities: Depreciation, depletion and amortization           229.7    187.0 Deferred income taxes                              152.2     88.6 Share-based compensation                             8.5      6.2 Abandonment and impairment                          16.8      4.1 Net (gain) from asset sales                         (3.4)    (0.5) Minority interest                                    4.5 (Income) from unconsolidated affiliates             (0.4)    (4.4) Distributions from unconsolidated affiliates         0.2      3.2 Net mark-to-market (gain) on basis swaps           (30.0)    (5.2) Changes in operating assets and liabilities        (56.3)     9.8 ——————- Net Cash Provided From Operating Activities     680.2    552.1 ——————-  INVESTING ACTIVITIES Capital expenditures                              (1,433.2)  (593.5) Cash used in disposition of assets                    (3.0)    (0.8) Proceeds from disposition of assets                   33.3      5.8 ———- ——– Net Cash Used In Investing Activities        (1,402.9)  (588.5) ——————-  FINANCING ACTIVITIES Common stock                                         (11.0)    (2.4) Long-term debt issued, net of issuance costs       1,491.6 Long-term debt repaid                               (643.0) Change in short-term debt                           (109.5)    22.5 Checks outstanding in excess of cash balances         14.4     23.5 Other                                                 (3.8) Dividends paid                                       (42.4)   (41.4) Excess tax benefits from share-based compensation                                         12.2      9.6 ——————- Net Cash Provided From Financing Activities     708.5     11.8 ——————-  Change in cash and cash equivalents                  (14.2)   (24.6) Beginning cash and cash equivalents                   14.2     24.6 ——————- Ending Cash and Cash Equivalents                 $       –  $     – ===================