Schedule
                           Wisconsin Apportionment Percentage
                            for Interstate Pipeline Companies
 Wisconsin DepartmentA-10  File with Wisconsin Form 1NPR, 2, 3, 4, 4T, 5S, or 6                                         2024
     of Revenue            Read instructions before filling in this schedule
Name                                                                                                          Identifying Number

Property Factor                                                                           Wisconsin               Total Company

                                                                   (i)                              (ii)       (i)              (ii)
                                                                   Beginning                 End of           Beginning         End of
                                                                   of Year                          Year       of Year          Year
 1  Land   . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
 2  Buildings  . . . . . . . . . . . . . . . . . . . . . . . .  2
  3  Furniture and fixtures . . . . . . . . . . . . . . .       3
  4  Transportation equipment  . . . . . . . . . . .            4
  5  Machinery and other equipment   . . . . . .                  5
  6  Depletable property  . . . . . . . . . . . . . . . .         6
  7  Leasehold improvements . . . . . . . . . . . .             7
  8  Inventories . . . . . . . . . . . . . . . . . . . . . . .  8
  9  Other (specify) . . . . . . . . . . . . . . . . . . . .    9
 10  Add lines 1 through 9 . . . . . . . . . . . . . . .         10

                                                                                             Wisconsin             Total Company
 11  Separately for the Wisconsin columns and the Total
     Company columns, add the amounts from line 10, 
     columns (i) and (ii), and divide each total by 2 . 
     This is the total property  . . . . . . . . . . . . . . . . . . . . . . .  .  11                     .00  11                      .00

 12  Divide Wisconsin column, line 11 by Total Company
     column, line 11, and multiply by 100 . . . . . . . . . . . . . .  .  12                        .         %
 13  Factor weight   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .  13    3 .000
 14  Divide line 12 by line 13 . This is the Wisconsin
     property factor   . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .  14             .    %

 Payroll Factor                                                                              Wisconsin             Total Company

 15  Wages, salaries, and other compensation paid to
      employees  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .  15                 .00  15                      .00
 16  Fees paid to affiliated corporations for personal
     services   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .  16              .00  16                      .00
 17  Add lines 15 and 16 . This is the total payroll  . . . . . . .  .  17                                .00  17                      .00
 18  Divide Wisconsin column, line 17 by Total Company
     column, line 17, and multiply by 100   . . . . . . . . . . . . .  .  18                        .    %
 19  Factor weight  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .  19     3 .000
 20  Divide line 18 by line 19 . This is the Wisconsin
     payroll factor   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .  20            .    %

IC-308 (R . 8-24)

2024 Schedule A-10 Name                                                                  ID Number                                                                                             Page 2 of 2 

                                                                                         Wisconsin                                                                                           Total Company

 Traffic Units Factor
 21   Traffic units  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
 22   Divide Wisconsin column, line 21 by Total Company
    column, line 21, and multiply by 100   . . . . . . . . . . . . .  22                 .                                                                                               %
 23   Factor weight   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     23 3 .000
 24   Divide line 22 by line 23 . This is the Wisconsin
      traffic units factor   . . . . . . . . . . . . . . . . . . . . . . . . . .  24     .                                                                                               %
Separate return filers and pass-through entities:
 25   Add lines 14, 20, and 24 . This is the Wisconsin percentage  .  . 25               .                                                                                               %

Combined return filers:
 26  Computation of total company sales:
      a  Gross receipts from the sale of inventory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                                           26a               .00
      b     Gross receipts from the operation of farms, mines, and quarries . . . . . . . . . . . .                             26b                                                                        .00
      c     Gross receipts from the sale of scrap or by-products   . . . . . . . . . . . . . . . . . . . . .                                                                             26c               .00
      d     Gross commissions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      26d                                                                        .00
      e     Gross receipts from personal and other services . . . . . . . . . . . . . . . . . . . . . . . .                                                                              26e               .00
      f     Gross rents from real property or tangible personal property . . . . . . . . . . . . . . .                          26f                                                                        .00
      g     Interest on trade accounts and trade notes receivable   . . . . . . . . . . . . . . . . . . . . . . . . .  .                                                                 26g               .00
      h     Partner’s share of partnership’s gross receipts  . . . . . . . . . . . . . . . . . . . . . . . . .                                                                           26h               .00
      i     Member’s share of limited liability company’s gross receipts . . . . . . . . . . . . . . .                                                                                   26i               .00
      j     Gross management fees  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                                   26j               .00
      k     Gross royalties from income-producing activities . . . . . . . . . . . . . . . . . . . . . . . .                                                                             26k               .00
      l     Gross franchise fees from income-producing activities  . . . . . . . . . . . . . . . . . . . .                                                                               26l               .00
 27  Add lines 26a through 26l  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                                  27                .00
    28Enter sales included above that are intercompany sales between combined group
    members  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   28                .00
 29   Enter sales included above that are not included in the computation of combined
    unitary income  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   29                                                                         .00
 30   Add lines 28 and 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                              30                .00
 31   Subtract line 30 from line 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       31                                                                         .00
 32   Enter intercompany sales previously eliminated from the amounts above if the gain
     or loss on the transaction was deferred and recognized in combined unitary
    income on this return  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                               32                .00
 33   Add lines 31 and 32. This is the modified sales factor denominator. Enter this amount
    on Form 6, Part III, line 1b   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      33                                                                         .00

 34   Add lines 14, 20, and 24 and enter the result   . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                                                          34  .                %
 35   Multiply line 33 by line 34. This is the modified sales factor numerator. Enter this
    amount on Form 6, Part III, line 1a  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .                                35                .00