Northern Natural Gas Company                                                  Original Sheet No. 201C
FERC Gas Tariff
Fifth Revised Volume No. 1

                      General Terms & Conditions

                     TABLE OF CONTENTS (Continued)

Section                                 Subject                                  Page

   53B           PERIODIC RATE ADJUSTMENT (PRA) - ELECTRIC
                 COMPRESSION POWER COSTS                                          302
                    o Purpose And Applicability                                   302
                    o Definitions                                                 302
                    o Methodology - Market Area And Field Area Electric
                      Compression Commodity Rates                                 302
                    o Effective Date                                              302
                    o True-Up Mechanism                                           302
                    o PRA Filing                                                 302A
   54            DISCOUNTING                                                      303
                    o Order Of Discounts                                          303
                    o Types Of Discounts                                          303
   55            OFF-SYSTEM SERVICES                                              304
   56            SEGMENTATION OF CAPACITY                                         305
                    o Market Area                                                 305
                    o Field Area                                                 305A
   57            PENALTY AND DDVC REVENUE CREDITING MECHANISM                     306
                    o Crediting Mechanism                                         306
                    o Allocation Method                                           306
                         1. Daily Delivery Variance Charges And Curtailment
                            Penalty                                               306
                         2. Receipt Point And Supply Shortfall And Excess
                            Penalties                                             306
                         3. Carlton Penalty                                       306
                         4. Unauthorized Gas                                      306
                         5. PDD Rollover Charge                                   306
   58            CROSS-REFERENCE FOR TARIFF-PERMITTED
                 PROVISIONS IN SERVICE AGREEMENTS                                 308






























Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: January 25, 2006                                             Effective: February 25, 2006