UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C.  20549FORM 10-Q



[X]

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934



For the quarter ended September 30, 2005



[  ]

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934



For the transition period from ___ to ___



Commission File Number 0-14147



QUESTAR PIPELINE COMPANY(Exact name of registrant as specified in charter)



STATE OF UTAH                                                                                             87-0307414

(State of other jurisdiction of                                                            (I.R.S. Employer

incorporation or organization)                                                          Identification No.)

180 East 100 South Street, P.O. Box 45360 Salt Lake City, Utah 84145-0360(Address of principal executive offices)
Registrant's telephone number, including area code (801) 324-2400

Not Applicable(Former name or former address, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 of 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes  [X]    No  [  ]



Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the exchange Act).  Yes  [  ]    No  [X]



Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes [ ]       No [X]



Indicate the number of shares outstanding of each of the issuers classes of common stock, as of the latest practicable date.



Class

Outstanding as of October 31, 2005



Common Stock, $1.00 par value

6,550,843 Shares

|Registrant meets the conditions set forth in General Instruction H (1) (a) and (b) of Form 10-Q and is filing this Form 10-Q with the reduced disclosure format.
|----------------------------------------------------------------------------------------------------------------------------------------------------------------



Questar Pipeline Company

Form 10-Q for the Quarterly Period Ended September 30, 2005



TABLE OF CONTENTS





Page No.



NATURE OF BUSINESS

2



FORWARD-LOOKING STATEMENTS AND RISK FACTORS

3



GLOSSARY OF COMMONLY USED TERMS

4



SEC FILINGS AND WEBSITE

5



PART I. FINANCIAL INFORMATION

5



Item 1.  Financial Statements

5



Consolidated Statements of Income for the three and nine months ended

5

September 30, 2005 and 2004



Condensed Consolidated Balance Sheets at September 30, 2005

6

and December 31, 2004



Condensed Consolidated Statements of Cash Flows for the nine months ended

7

September 30, 2005 and 2004



Notes Accompanying the Consolidated Financial Statements

7



Item 2.  Managements Discussion and Analysis of Financial Condition and

9

Results of Operations



Item 4.  Controls and Procedures

13



PART II. OTHER INFORMATION

13



Item 6.  Exhibits

11



Signatures

13



NATURE OF BUSINESS



Questar Pipeline Company (Questar Pipeline or the Company) is an interstate pipeline company that provides natural gas-transportation and underground storage services in Utah, Wyoming and Colorado. As a natural gas company under the Natural Gas Act of 1938, Questar Pipeline and certain subsidiary pipeline companies are regulated by the Federal Energy Regulatory Commission (FERC). The Company also provides non-jurisdictional gas processing and gathering. Questar Pipeline is a wholly owned subsidiary of Questar Corporation (Questar) headquartered in Salt Lake City, Utah.



FORWARD-LOOKING STATEMENTS AND RISK FACTORS



This report 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. All statements other than statements of historical facts included or incorporated by reference in this report, including, without limitation, statements regarding the future financial position, business strategy, budgets, projected costs and plans and objectives of management for future operations, are forward-looking statements. In addition, forward-looking statements generally can be identified by the use of forward-looking terminology such as may, will, could, expect, intend, project, estimate, anticipate, believe, forecast, or continue or the negative thereof or variations thereon or similar terminology. Although these statements are made in good faith and are reasonable representations of Questar Pipelines expected performance at the time, actual results may vary from managements stated expectations and projections due to a variety of factors.



Important assumptions and other significant factors that could cause actual results to differ materially from those expressed or implied in forward-looking statements include, but are not limited to, the following:



Questar Pipeline must comply with numerous regulations from the federal, state and local level

Questar Pipeline is subject to federal, state and local environmental, health and safety laws and regulations. Environmental laws and regulations are complex, change frequently and tend to become more onerous over time. In addition to the costs of compliance, the Company may incur substantial costs to take corrective actions at both owned and previously owned facilities. Accidental spills and leaks requiring cleanup may occur in the ordinary course of business. As standards change, the Company may incur significant costs in cases where past operations followed practices that were considered acceptable at the time but that now require remedial work to meet current standards. Failure to comply with these laws and regulations may result in fines, significant costs for remedial activities, or injunctions.





Questar Pipeline must comply with numerous and complex regulations governing activities on federal and state lands in the Rocky Mountain region, notably the National Environmental Policy Act, the Endangered Species Act and the National Historic Preservation Act. Federal and state agencies frequently impose conditions on the Companys activities. These restrictions tend to become more stringent over time, and can limit or prevent the Company from transporting and storing natural gas.



Various federal agencies within the U.S. Department of the Interior, particularly the Minerals Management Service and the Bureau of Indian Affairs, along with each Native American tribe, promulgate and enforce regulations pertaining to gas and oil operations on Native American tribal lands. These regulations include such matters as lease provisions, drilling and production requirements, environmental standards and royalty considerations. In addition, each Native American tribe is a sovereign nation having the right to enforce laws and regulations independent from federal, state and local statutes and regulations. These tribal laws and regulations include various taxes, fees, requirements to employ Native American tribal members, and other conditions that apply to lessees, operators and contractors conducting operations on Native American tribal lands. Finally, lessees and operators conducting operations on tribal lands are generally subject to the Native American tribal court system. One or more of these factors may increase the Companys costs of doing business on Native American tribal lands and have an impact on the viability of its gas and oil operations on such lands.



Questar Pipelines natural gas-transportation and storage operations are regulated by the FERC under the Natural Gas Act of 1938 and the Natural Gas Policy Act of 1978. The FERC has authority to: set rates for natural gas transportation, storage and related services; set rules governing business relationships between the pipeline subsidiary and its affiliates; approve new pipeline and storage-facility construction; and establish policies and procedures for accounting, purchase, sale, abandonment and other activities. FERC policies may adversely affect Questar Pipeline profitability.



Questar Pipeline incurs significant costs to comply with federal pipeline-safety regulations. Questar Pipeline may also be affected by possible future regulations requiring the tracking, reporting and reduction of greenhouse-gas emissions.





Other factors may affect Questar Pipelines results

Other factors may affect Questar Pipelines results such as changes in general economic conditions; changes in regulation; availability and economic viability of gas and oil properties for sale or exploration; creditworthiness of counterparties; rate of inflation and interest rates; assumptions used in business combinations; weather and natural disasters; changes in customers credit ratings; competition from other forms of energy, other pipelines and storage facilities; effects of accounting policies issued periodically by accounting standard-setting bodies; terrorist attacks or acts of war; changes in the business or financial condition of the Company; changes in credit ratings; and availability of financing.



The Company cannot predict these factors nor can it assess the impact, if any, of such factors on its financial position or its results of operations. Accordingly, forward-looking statements should not be relied upon as a predictor of actual results. Questar Pipeline undertakes no obligation to update any forward-looking statement provided in this report.



GLOSSARY OF COMMONLY USED TERMS



Btu

One British thermal unit  a measure of the amount of energy required to raise the temperature of one pound of water one degree Fahrenheit at sea level.



cf

Cubic foot is a common unit of gas measurement. One standard cubic foot equals the volume of gas in one cubic foot measured at standard conditions  a temperature of 60 degrees Fahrenheit and a pressure of 30 inches of mercury (approximately 14.73 pounds per square inch).



dew point

A specific temperature and pressure at which hydrocarbons condense to form a liquid.



dth

Decatherms or ten therms. One dth equals one million Btu or approximately one Mcf.



gas

All references to gas in this report refer to natural gas.



Mcf

One thousand cubic feet.



Mdth

One thousand decatherms.



MMcf

One million cubic feet.



MMdth

One million decatherms.



SEC FILINGS AND WEBSITE INFORMATION



Questar Pipeline files annual, quarterly, and current reports with the Securities and Exchange Commission (SEC). Questar Pipeline also regularly files other documents with the SEC. Investors can read and copy any materials filed with the SEC at its Public Reference Room at 450 Fifth Street, N.W., Washington, D.C. 20549, and can obtain information about the operations of the Public Reference Room by calling the SEC at 1-800-SEC-0300. The SEC also maintains a website that contains information filed electronically that can be accessed over the Internet at www.sec.gov.



Investors can also access financial and other information for Questar Pipeline at Questars website at www.questar.com. Questars website contains Statements of Responsibility for Board Committees, Corporate Governance Guidelines and its Business Ethics and Compliance Policy.



Questar Pipeline makes available, free of charge through the website, copies of Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, and any amendments to such reports. Access to these reports is provided as soon as reasonably practical after such reports are electronically filed with the commission.





PART I. FINANCIAL INFORMATION



ITEM 1. FINANCIAL STATEMENTS



QUESTAR PIPELINE COMPANY

CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)



|                                    | 3 Months Ended | 9 Months Ended
|----------------------------------- | -------------- | --------------
|                                    | September 30,  | September 30, 
|                                    | 2005           | 2004          
|                                    | (in thousands)
|REVENUES                            |                |               
|From unaffiliated customers         | $22,584        | $18,345       
|From affiliates                     | 20,182         | 22,083        
|TOTAL REVENUES                      | 42,766         | 40,428        
|                                    |                |               
|OPERATING EXPENSES                  |                |               
|Operating and maintenance           | 13,522         | 13,388        
|Other taxes                         | 1,686          | 1,673         
|Depreciation and amortization       | 7,340          | 6,961         
|                                    |                |               
|TOTAL OPERATING EXPENSES            | 22,548         | 22,022        
|                                    |                |               
|OPERATING INCOME                    | 20,218         | 18,406        
|                                    |                |               
|Interest and other income (expense) | 193            | (3)           
|Debt expense                        | (5,556)        | (5,554)       
|                                    |                |               
|INCOME BEFORE INCOME TAXES          | 14,855         | 12,849        
|                                    |                |               
|Income taxes                        | 5,632          | 4,813         
|                                    |                |               
|NET INCOME                          | $  9,223       | $  8,036      
|                                    |                |               



See notes accompanying the consolidated financial statements



QUESTAR PIPELINE COMPANY

CONDENSED CONSOLIDATED BALANCE SHEETS



|                                               | September 30,  | December 31, 
|---------------------------------------------- | -------------- | -------------
|                                               | 2005           | 2004         
|                                               | (Unaudited)    |              
|                                               | (in thousands)
|ASSETS                                         |                |              
|Current assets                                 |                |              
|Cash and cash equivalents                      | $       2,672  | $       3,007
|Notes receivable from Questar                  | 7,500          | 2,900        
|Accounts receivable                            | 6,212          | 7,840        
|Accounts receivable from affiliates            | 2,526          | 2,011        
|Materials and supplies, at lower               |                |              
|of average cost or market                      | 3,401          | 3,411        
|Prepaid expenses and other                     | 800            | 3,366        
|Total current assets                           | 23,111         | 22,535       
|Property, plant and equipment                  | 1,108,001      | 1,055,030    
|Less accumulated depreciation and amortization | 375,510        | 355,407      
|Net property, plant and equipment              | 732,491        | 699,623      
|Regulatory assets                              | 11,269         | 11,803       
|Goodwill                                       | 4,185          | 4,185        
|Other assets                                   | 11,375         | 16,839       
|                                               |                |              
|                                               | $    782,431   | $   754,985  
|                                               |                |              
|LIABILITIES AND SHAREHOLDER'S EQUITY           |               
|Current liabilities                            |                |              
|Notes payable to Questar                       | $      48,700  | $     28,000 
|Accounts payable and accrued expenses          | 20,251         | 18,433       
|Accounts payable to affiliates                 | 3,443          | 4,783        
|Total current liabilities                      | 72,394         | 51,216       
|Long-term debt                                 | 310,111        | 310,096      
|Deferred income taxes                          | 118,402        | 115,321      
|Other long-term liabilities                    | 13,744         | 16,602       
|                                               |                |              
|Common Shareholders Equity                    |                |              
|Common stock                                   | 6,551          | 6,551        
|Additional paid-in capital                     | 142,034        | 142,034      
|Retained earnings                              | 119,195        | 113,165      
|Total common shareholder's equity              | 267,780        | 261,750      
|                                               |                |              
|                                               | $    782,431   | $   754,985  



See notes accompanying the consolidated financial statements



QUESTAR PIPELINE COMPANY

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)



|                                            | 9 Months Ended
|------------------------------------------- | --------------
|                                            | September 30, 
|                                            | 2005          
|                                            | (in thousands)
|OPERATING ACTIVITIES                        |               
|Net income                                  | $  25,155     
|Adjustments to reconcile net income to net  |               
|cash provided from operating activities:    |               
|Depreciation and amortization               | 22,705        
|Deferred income taxes                       | 3,081         
|Net (gain) loss from asset sales            | (383)         
|                                            | 50,558        
|Change in operating assets and liabilities  | 9,686         
|NET CASH PROVIDED FROM OPERATING            |               
|ACTIVITIES                                  | 60,244        
|                                            |               
|INVESTING ACTIVITIES                        |               
|Purchase of property, plant and equipment   | (56,643)      
|Cash used in disposition of property, plant |               
|and equipment                               | (911)         
|NET CASH USED IN INVESTING ACTIVITIES       | (57,554)      
|                                            |               
|FINANCING ACTIVITIES                        |               
|Change in notes receivable from Questar     | (4,600)       
|Change in notes payable to Questar          | 20,700        
|Dividends paid                              | (19,125)      
|NET CASH USED IN FINANCING ACTIVITIES       | (3,025)       
|                                            |               
|Change in cash and cash equivalents         | (335)         
|Beginning cash and cash equivalents         | 3,007         
|Ending cash and cash equivalents            | $     2,672   
|                                            |               



See notes accompanying the consolidated financial statements



QUESTAR PIPELINE COMPANY

NOTES ACCOMPANYING THE CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)





Note 1  Basis of Presentation of Interim Consolidated Financial Statements



The accompanying interim consolidated financial statements of Questar Pipeline have not been audited by an independent registered public accounting firm with the exception of the condensed consolidated balance sheet at December 31, 2004, which was derived from the audited consolidated financial statements at that date. The unaudited consolidated financial statements were prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the SECs instructions for Form 10-Q. The interim consolidated financial statements reflect all normal, recurring adjustments and accruals that are, in the opinion of management, necessary for a fair presentation of the financial position and results of operations for the interim periods presented. The preparation of consolidated financial statements and notes in conformity with GAAP requires that management make estimates and assumptions that affect the amounts of assets and liabilities and disclosure of contingent assets and liabilities. Actual results could differ from estimates. All significant intercompany accounts and transactions were eliminated in consolidation. Certain reclassifications were made to the 2004 financial statements to conform with the 2005 presentation.



The results of operations for the nine months ended September 30, 2005, are not necessarily indicative of the results that may be expected for the year ending December 31, 2005, due to the factors listed in the Forward-Looking Statements and Risk Factors section of this report. Interim consolidated financial statements do not include all of the information and notes required by GAAP for audited annual consolidated financial statements. For further information please refer to the consolidated financial statements and notes included in the Companys Annual Report on Form 10-K as amended for the year ended December 31, 2004.



Note 2  Fuel-Gas Reimbursement Percentage (FGRP)



During the fourth quarter of 2004, the FERC issued an order to Questar Pipeline in a case involving the annual FGRP. The FERC previously granted Questar Pipelines request to increase the FGRP effective January 1, 2004. In its order, the FERC approved the FGRP but also ruled that Questar Pipeline was required to credit to transportation customers proceeds from the sale of natural gas liquids recovered from its hydrocarbon dew point facilities at the Kastler plant in northeastern Utah. Questar Pipeline accrued a potential liability equal to any liquid revenues from the dew point plant. Through June 30, 2005, Questar Pipeline had reduced revenues by $5.4 million as a credit to customers, including $0.7 million recorded in the first half of 2005.



Questar Pipeline made an annual FGRP filing with the FERC on November 30, 2004, requesting an increase in the FGRP to 2.6%. On December 30, 2004, the FERC approved the request on an interim basis subject to refund and final resolution of the 2004 FGRP proceeding. Several shippers filed comments with the FERC protesting the FGRP level.



On June 17, 2005, Questar Pipeline filed an uncontested offer of settlement with the FERC to resolve the outstanding issues in the 2004 and 2005 FGRP filings. This settlement with customers was approved July 26, 2005, and contains the following terms: (a) the settlement will cover the period from June 1, 2005 through December 31, 2007; (b) no adjustments will be made to FGRP amounts collected by Questar Pipeline prior to June 2005; (c) one-half of the Kastler plant liquid revenues from August 2001 through December 2007 will be refunded to customers and the remaining revenues will be retained by Questar Pipeline; and (d) Questar Pipeline will reduce the FGRP amount collected from customers from 2.6% to 2.1% effective June 1, 2005. This percentage consists of 1.95% of ongoing FGRP related costs and 0.15% of prior-period amortization of costs. If actual ongoing costs are less than the 1.95%, the difference will be shared equally with customers beginning January 2006. Questar Pipeline recorded the impact of the settlement in third quarter 2005 increasing liquid revenues by $2.7 million and net income by $1.7 million.



Note 3  Questar Regulated Services Merger



Questar Pipelines parent company, Questar Regulated Services Company (Regulated Services), merged effective March 31, 2005 with Questar Gas Company (Questar Gas). Questar Gas was the surviving company. Regulated Services was a holding company that provided management, engineering and accounting services for its wholly owned subsidiaries, Questar Pipeline and Questar Gas. Regulated Services was a wholly owned subsidiary of Questar. Questar Pipeline and Questar Gas became wholly owned subsidiaries of Questar as a result of the merger.



Note 4  Southern Trails



The western segment of the Southern Trails line, which runs from the California-Arizona border to Long Beach, California, is currently not in service except for the first 34 miles. Questar Pipelines investment is approximately $51 million. Additional investment would be required to complete the conversion of the pipeline from a liquid pipeline to a natural gas pipeline and make connections to customers. During the third quarter of 2005, Questar Pipeline withdrew its proposal with the Los Angeles Department of Water and Power to complete conversion of the pipeline for natural gas service. Questar Pipeline has been holding discussions with other potential purchasers of the pipeline. Depending upon the results of these discussions, Questar Pipeline may be required to recognize an impairment in the value of Southern Trails in the near term. The magnitude of any such impairment is not known but could be material. Questar Pipeline performed an impairment test for third quarter 2005 in accordance with the provisions of SFAS 144. Based on the results of the test, Questar Pipeline has concluded that no impairment is required based on current expectations.



Note 5  Recent Accounting Developments



In July 2005, the Financial Accounting Standards Board (FASB) issued an exposure draft of a Proposed Interpretation Accounting for Uncertain Tax Positions, an Interpretation of FASB Statement 109. The exposure draft seeks to reduce perceived diversity in practice associated with recognition and measurement in the accounting for income taxes. The exposure draft would apply to all tax positions accounted for in accordance with SFAS 109 Accounting for Income Taxes. The exposure draft requires that a tax position meet a probable recognition threshold for the benefit of the uncertain tax position to be recognized in the financial statements. This threshold is to be met assuming that the tax authorities will examine the uncertain tax position. The exposure draft contains guidance with respect to the measurement of the benefit that is recognized for an uncertain tax position, when that benefit should be derecognized, and other matters. This interpretation is effective for Questar Pipeline beginning January 1, 2006 under the timeframe in the proposed statement. The Company has not evaluated the potential effect of this proposed change in accounting principle.



Questar has granted and may continue to grant stock-based compensation to certain Questar Pipeline employees. In December 2004 the FASB issued Statement 123 (revised 2004), (SFAS 123R), Share Based Payment, which replaces SFAS 123 and supersedes APB Opinion 25. SFAS 123R eliminates the alternative to use APB Opinion 25s intrinsic value method of accounting that was provided in SFAS 123 as originally issued. After a phase-in period for SFAS 123R, pro forma disclosure will no longer be allowed. The Companys effective date for implementation of SFAS 123R is January 1, 2006. Alternative phase-in methods are allowed under SFAS 123R. The Company currently anticipates using the modified prospective phase-in method that requires recognition of compensation costs for all share based payments granted, modified or settled after the date of implementation as well as for any awards that were granted prior to the implementation date for which the required service has not yet been performed. The Company believes none of the alternative phase-in methods will have a material effect on operating results or financial position.



In March 2005, the FASB issued Interpretation No. 47 (FIN 47), Accounting for Conditional Asset Retirement Obligations  an Interpretation of FASB Statement No. 143 (SFAS 143). FIN 47 clarifies the term conditional asset retirement obligation as used in SFAS 143 and requires a liability to be recorded if the fair value of the obligation can be reasonably estimated. The types of asset retirement obligations that are covered by FIN 47 are those for which an entity has a legal obligation to perform an asset retirement activity; however the timing and/or method of settling the obligation are conditional on a future event that may or may not be within the control of the entity. FIN 47 also clarifies when an entity would have sufficient information to reasonably estimate the fair value of an asset retirement obligation. FIN 47 is effective no later than fiscal years ending after December 15, 2005. The Company does not expect the guidelines of FIN 47 will have a significant impact on its results of operations or financial position.



ITEM 2. MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

(Unaudited)



SUMMARY



Questar Pipeline net income increased 15% in the third quarter of 2005 compared to the 2004 period as a result of a settlement reached with shippers on the sharing of liquid revenues. Questar Pipeline net income increased 8% in the first nine months of 2005 due to the settlement and new transportation contracts.



RESULTS OF OPERATIONS



Following is a summary of Questar Pipelines financial and operating results for the third quarter and first nine months of 2005 compared with the same periods of 2004:



|                                                         | 3 Months Ended | 9 Months Ended
|-------------------------------------------------------- | -------------- | --------------
|                                                         | September 30,  | September 30, 
|                                                         | 2005           | 2004          
|                                                         | (in thousands)
|OPERATING INCOME                                         |                |               
|Revenues                                                 |                |               
|Transportation                                           | $26,643        | $26,311       
|Storage                                                  | 9,156          | 9,322         
|Carbon dioxide processing                                | 1,405          | 1,946         
|Liquid revenues and other                                | 5,562          | 2,849         
|Total revenues                                           | 42,766         | 40,428        
|Operating expenses                                       |                |               
|Operating and maintenance                                | 13,522         | 13,388        
|Other taxes                                              | 1,686          | 1,673         
|Depreciation and amortization                            | 7,340          | 6,961         
|Total operating expenses                                 | 22,548         | 22,022        
|Operating income                                         | $20,218        | $18,406       
|                                                         |                |               
|OPERATING STATISTICS                                     |                |               
|Natural gas transportation volumes (in Mdth)             |                |               
|For unaffiliated customers                               | 71,257         | 60,128        
|For Questar Gas                                          | 16,594         | 14,825        
|For other affiliated customers                           | 9,072          | 5,506         
|Total transportation                                     | 96,923         | 80,459        
|Transportation revenue (per dth)                         | $    0.27      | $    0.33     
|Firm-daily transportation demand at
September 30, (Mdth) | 1,832          | 1,643         



Questar Pipelines net income was $9.2 million in the third quarter of 2005 compared with $8.0 million in the third quarter of 2004. For the first nine months of 2005, Questar Pipelines net income was $25.2 million compared with $23.4 million in the year-earlier period. Revenues increased in the 2005 period due to new transportation contracts and settlement of a liquids revenue sharing dispute with customers. See Note 2 in the Notes Accompanying the Consolidated Financial Statements in this report for a discussion of the settlement. The earnings increase in the first nine months of 2005 included $237,000 after-tax gains from the sale of assets and the capitalization of $899,000 of carrying costs on construction projects.



Revenues

Gas transportation volumes increased in the third quarter of 2005 and first nine months of 2005 over the prior year periods due to new transportation contracts. Following is a summary of major changes in Questar Pipelines revenues for the three and nine months ended September 30, 2005, compared with the same periods of 2004:



|                                                | 3 Months Ended
September 30, 2005
Compared with 2004 | 9 Months Ended
September 30, 2005
Compared with 2004
|----------------------------------------------- | ---------------------------------------------------- | ----------------------------------------------------
|                                                | (in thousands)                                      
|Transportation                                  |                                                      |                                                     
|New transportation contracts                    | $   996                                              | $  2,319                                            
|Expiration of transportation contracts          | (450)                                                | (1,082)                                             
|Elimination of Gas Research Institute
surcharge | (100)                                                | (578)                                               
|Other transportation                            | (114)                                                | (47)                                                
|Storage                                         | (166)                                                | (312)                                               
|Carbon dioxide processing                       | (541)                                                | (795)                                               
|Liquid revenues and other                       |                                                      |                                                     
|Change in liquid revenues before credit         | 75                                                   | 289                                                 
|Reversal of credit of Kastler liquid
revenues   | 2,723                                                | 2,723                                               
|Park and loan revenue                           | (227)                                                | 496                                                 
|Other                                           | 142                                                  | 297                                                 
|Increase                                        | $ 2,338                                              | $ 3,310                                             



Questar Pipeline has expanded its transportation system in response to growing regional natural gas production and transportation demand. Questar Pipeline added new transportation contracts in 2004 and 2005 for deliveries to the Kern River pipeline at Goshen, Utah. In the second quarter of 2005, Questar Pipeline began service to an electric generation facility in central Utah.



Questar Pipelines existing transportation system is nearly fully subscribed. As of September 30, 2005, Questar Pipeline had firm-transportation contracts of 1,832 Mdth per day compared with 1,643 Mdth per day as of September 30, 2004. The increase was primarily due to a new contract of 190 Mdth per day with an electric generation facility. Questar Pipelines firm-transportation contracts had a weighted average remaining life of 10.9 years as of September 30, 2005.



Questar Gas is Questar Pipelines largest transportation customer with contracts for 951 Mdth per day, including 50 Mdth per day for winter-peaking service. The majority of Questar Gass transportation contract demand extends through mid 2017.



Questar Pipelines primary storage facility is Clay Basin in eastern Utah. This facility is 100% subscribed under long-term contracts. In addition to Clay Basin Questar Pipeline also owns and operates three smaller aquifer gas storage facilities. Questar Pipelines firm storage contracts had a weighted average remaining life of 8.2 years as of September 30, 2005.



Questar Gas has contracted for 26% of firm-storage capacity at Clay Basin for terms extending from three to 14 years and 100% of the firm-storage capacity at the aquifer facilities for terms extending for 13 years.



Questar Pipeline charges FERC-approved transportation and storage rates that are based on straight-fixed-variable rate design. Under this rate design all fixed costs of providing service including depreciation and return on investment are recovered through the demand charge. About 95% of Questar Pipeline costs are fixed and recovered through these demand charges. Questar Pipelines earnings are driven primarily by demand revenues from firm shippers. Operating costs that vary based on throughput are recovered through volumetric charges. Since demand charges are based on contract levels and volumetric charges are about 5%, period-to-period changes in firm-transportation volumes do not have a significant impact on earnings.



Expenses

Operating and maintenance expenses increased 1% in the third quarter of 2005 and 1% in the first nine months of 2005 compared with corresponding 2004 periods. The increases were primarily due to higher labor and labor overhead costs offset by the elimination of the Gas Research Institute customer surcharge. Operating and maintenance expenses per dth transported were $0.14 in the first nine months of 2005 compared with $0.15 in the first nine months of 2004. Operating and maintenance includes processing and storage costs.



Depreciation expense increased in the 2005 periods reflecting increased pipeline investment.



Clay Basin Storage

Questar Pipeline continues to investigate a potential discrepancy between the book volumes of cushion gas at Clay Basin and cushion-gas volumes implied by pressure-survey data obtained in recent field tests. The current book volume of the cushion gas is 61.5 bcf with a book value of $99.7 million. Questar Pipeline believes the range of the potential discrepancy is 0  5 bcf. Analysis to date has not revealed any leaks or gas migration out of the reservoir. Additional reservoir tests and analysis, including reservoir modeling, have narrowed the potential discrepancy. Testing will continue in the fall and spring. This potential discrepancy has not prevented Questar Pipeline from meeting its obligations to storage customers.



If Questar Pipeline determines that the discrepancy is due to changes in the physical conditions in the storage reservoir, the financial impact may include additional investment in cushion gas to meet service obligations. If the discrepancy is due to lost-and-unaccounted-for-gas related to the aggregate impact of about 30 years of service, Questar Pipeline would expense the original cost of the portion of cushion gas determined to be lost and could file with the FERC to recover costs from customers. The Company believes that the reasonable possible range of losses due to lost-and-unaccounted-for gas is $0 to $8 million before recovery of costs from customers or income tax effects.



New Long-term Contracts

During first quarter 2004 Questar Pipeline obtained long-term transportation contracts to support a $54 million expansion of its central Utah transportation system. The expansion will add 102 Mdth per day of capacity from the Piceance and Uinta basins to the Kern River pipeline, a power-generation facility and Questar Gass distribution system. On January 21, 2005, the FERC approved the expansion. As of September 30, 2005, construction of the expansion was nearly complete. Questar Pipeline began partial service in September 2005 and expects to begin full service in the fourth quarter 2005.



Carbon Dioxide Processing Plant

Questar Transportation Services, a subsidiary of Questar Pipeline, owns non-jurisdictional gathering lines and a processing plant near Price, Utah. The plant was built in 1999 to process gas on behalf of Questar Gas. Questar Gas has contracted for the plants firm capacity and pays the cost of service for operating the plant.



Regulation

FERC Order No. 2004, which defines standards of conduct for transportation providers, became effective on September 22, 2004. These standards of conduct are designed to ensure that employees engaged in transportation-system operations function independently from employees of marketing and energy affiliates. In addition, a transportation provider must treat all transportation customers on a non-discriminatory basis and must not operate its transportation system to preferentially benefit its marketing or energy affiliates. Questar Pipeline has determined that all Questar Market Resources, Inc. subsidiaries except Questar Gas Management Co. are marketing or energy affiliates. Questar Gas is not an energy or marketing affiliate. Questar Pipeline and other Questar companies have adopted new procedures to comply with this order.



Questar Pipeline is required to comply with the Pipeline Safety Improvement Act of 2002. This act and the rules issued by the Department of Transportation (DOT) require interstate pipelines and local distribution companies to implement a 10-year program of risk analysis, pipeline assessment and remedial repair for transportation pipelines located in high-consequence areas such as densely populated locations. Questar Pipelines plan for complying with the act was filed with the DOT during 2004. Questar Pipeline estimates that its annual cost to comply with the act will be approximately $1 million, not including costs of pipeline replacement, if necessary.



See Note 2 in the Notes Accompanying the Consolidated Financial Statements in this report for a discussion of the Fuel Gas Reimbursement Percentage filings with the FERC.



ITEM 4.  CONTROLS AND PROCEDURES.



Evaluation of Disclosure Controls and Procedures.

The Companys Chief Executive Officer and Chief Financial Officer have evaluated the effectiveness of the Companys disclosure controls and procedures (as such term is defined in Rules 13a-15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act)) as of the end of the period covered by the report (the Evaluation Date). Based on such evaluation, such officers have concluded that, as of the Evaluation Date, the Companys disclosure controls and procedures are effective in alerting them on a timely basis to material information relating to the Company, including its consolidated subsidiaries, required to be included in the Companys reports filed or submitted under the Exchange Act. The Companys Chief Executive Officer and Chief Financial Officer also concluded that the controls and procedures were effective in ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the Companys management including its principal executive and financial officers or persons performing similar functions as appropriate to allow timely decisions regarding required disclosure.



Changes in Internal Controls.

Since the Evaluation Date, there have not been any changes in the Companys internal controls or other factors during the most recent fiscal quarter that could materially affect such controls.





PART II.  OTHER INFORMATION



ITEM 6.  EXHIBITS



The following exhibits are filed as part of this report:



Exhibit No.

Exhibit



31.1.

Certification signed by Alan K. Allred, Questar Pipeline Companys Chief Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.



31.2.

Certification signed by S. E. Parks, Questar Pipeline Companys Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.



32.

Certification signed by Alan K. Allred and S. E. Parks, Questar Pipeline Companys Chief Executive Officer and Chief Financial Officer, respectively, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.







SIGNATURES



Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.



QUESTAR PIPELINE COMPANY

(Registrant)







November 10, 2005

/s/Alan K. Allred_____________________

Date

Alan K. Allred

Chief Executive Officer







November 10, 2005

/s/S. E. Parks_________________________

Date

S. E. Parks

Vice President and Chief Financial Officer



Exhibits List



Exhibit No.

Exhibit



31.1.

Certification signed by Alan K. Allred, Questar Pipeline Companys Chief Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.



31.2.

Certification signed by S. E. Parks, Questar Pipeline Companys Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.



32.

Certification signed by Alan K. Allred and S. E. Parks, Questar Pipeline Companys Chief Executive Officer and Chief Financial Officer, respectively, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.



Exhibit 31.1.



CERTIFICATION





I, A. K. Allred, certify that:





1.

I have reviewed this quarterly report of Questar Pipeline Company on Form 10-Q for the period ending September 30, 2005;



2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;



3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;



4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and we have:



a)

designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;



b)

designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;



c)

evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and



d)

disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting.



5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent function):



a)

all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and



b)

any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.





November 10, 2005

/s/A. K. Allred



Date

A. K. Allred,

Chief Executive Officer



Exhibit 31.2.



CERTIFICATION





I, S. E. Parks, certify that:





1.

I have reviewed this quarterly report of Questar Pipeline Company on Form 10-Q for the period ending September 30, 2005;



2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this quarterly report;



3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;



4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and we have:



a)

designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;



b)

designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;



c)

evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and



d)

disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting.



5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent function):



a)

all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and



b)

any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.





November 10, 2005

/s/S. E. Parks



Date

S. E. Parks

Vice President and Chief Financial Officer







Exhibit No. 32.





CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002





In connection with the Quarterly Report of Questar Pipeline Company on Form 10-Q for the period ending September 30, 2005, as filed with the Securities and Exchange Commission on the date hereof (the Report), Alan K. Allred, Chief Executive Officer of the Company, and S. E. Parks, Vice President and Chief Financial Officer of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:



(1)

The Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and



(2)

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.



QUESTAR PIPELINE COMPANY







November 10, 2005

/s/Alan K. Allred



Date

Alan K. Allred

Chief Executive Officer







November 10, 2005

/s/S. E. Parks



Date

S. E. Parks

Vice President and Chief Financial Officer