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Jointly Owned Facilities
 12 Months Ended
Dec. 31, 2013
Jointly Owned Facilities [Line Items]  
Jointly Owned Facilities

14. Jointly Owned Facilities

 

(All Registrants except PPL Electric)

 

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53

Each subsidiary owning these interests provides its own funding for its share of the facility. Each receives a portion of the total output of the generating plants equal to its percentage ownership. The share of fuel and other operating costs associated with the plants is included in the corresponding operating expenses on the Statements of Income.

 

In addition to the interests mentioned above, at December 31, 2012, PPL Montana had a 50% leasehold interest in Colstrip Units 1 and 2 and a 30% leasehold interest in Colstrip Unit 3 under operating leases. In December 2013, PPL Montana terminated the operating lease arrangement and acquired these interests. See Note 8 for additional information. At December 31, 2013, the book value of the acquired assets was not significant. At December 31, 2013 and 2012, NorthWestern owned a 30% interest in Colstrip Unit 4. PPL Montana and NorthWestern have a sharing agreement that governs each party's responsibilities and rights relating to the operation of Colstrip Units 3 and 4. Under the terms of that agreement, each party is responsible for 15% of the total non-coal operating and construction costs of Colstrip Units 3 and 4, regardless of whether a particular cost is specific to Colstrip Unit 3 or 4, and is entitled to take up to the same percentage of the available generation from Units 3 and 4.

PPL Energy Supply LLC [Member]
  
Jointly Owned Facilities [Line Items]  
Jointly Owned Facilities

14. Jointly Owned Facilities

 

(All Registrants except PPL Electric)

 

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53

Each subsidiary owning these interests provides its own funding for its share of the facility. Each receives a portion of the total output of the generating plants equal to its percentage ownership. The share of fuel and other operating costs associated with the plants is included in the corresponding operating expenses on the Statements of Income.

 

In addition to the interests mentioned above, at December 31, 2012, PPL Montana had a 50% leasehold interest in Colstrip Units 1 and 2 and a 30% leasehold interest in Colstrip Unit 3 under operating leases. In December 2013, PPL Montana terminated the operating lease arrangement and acquired these interests. See Note 8 for additional information. At December 31, 2013, the book value of the acquired assets was not significant. At December 31, 2013 and 2012, NorthWestern owned a 30% interest in Colstrip Unit 4. PPL Montana and NorthWestern have a sharing agreement that governs each party's responsibilities and rights relating to the operation of Colstrip Units 3 and 4. Under the terms of that agreement, each party is responsible for 15% of the total non-coal operating and construction costs of Colstrip Units 3 and 4, regardless of whether a particular cost is specific to Colstrip Unit 3 or 4, and is entitled to take up to the same percentage of the available generation from Units 3 and 4.

LG And E And KU Energy LLC [Member]
  
Jointly Owned Facilities [Line Items]  
Jointly Owned Facilities

14. Jointly Owned Facilities

 

(All Registrants except PPL Electric)

 

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53

Each subsidiary owning these interests provides its own funding for its share of the facility. Each receives a portion of the total output of the generating plants equal to its percentage ownership. The share of fuel and other operating costs associated with the plants is included in the corresponding operating expenses on the Statements of Income.

 

In addition to the interests mentioned above, at December 31, 2012, PPL Montana had a 50% leasehold interest in Colstrip Units 1 and 2 and a 30% leasehold interest in Colstrip Unit 3 under operating leases. In December 2013, PPL Montana terminated the operating lease arrangement and acquired these interests. See Note 8 for additional information. At December 31, 2013, the book value of the acquired assets was not significant. At December 31, 2013 and 2012, NorthWestern owned a 30% interest in Colstrip Unit 4. PPL Montana and NorthWestern have a sharing agreement that governs each party's responsibilities and rights relating to the operation of Colstrip Units 3 and 4. Under the terms of that agreement, each party is responsible for 15% of the total non-coal operating and construction costs of Colstrip Units 3 and 4, regardless of whether a particular cost is specific to Colstrip Unit 3 or 4, and is entitled to take up to the same percentage of the available generation from Units 3 and 4.

Louisville Gas And Electric Co [Member]
  
Jointly Owned Facilities [Line Items]  
Jointly Owned Facilities

14. Jointly Owned Facilities

 

(All Registrants except PPL Electric)

 

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53

Each subsidiary owning these interests provides its own funding for its share of the facility. Each receives a portion of the total output of the generating plants equal to its percentage ownership. The share of fuel and other operating costs associated with the plants is included in the corresponding operating expenses on the Statements of Income.

 

In addition to the interests mentioned above, at December 31, 2012, PPL Montana had a 50% leasehold interest in Colstrip Units 1 and 2 and a 30% leasehold interest in Colstrip Unit 3 under operating leases. In December 2013, PPL Montana terminated the operating lease arrangement and acquired these interests. See Note 8 for additional information. At December 31, 2013, the book value of the acquired assets was not significant. At December 31, 2013 and 2012, NorthWestern owned a 30% interest in Colstrip Unit 4. PPL Montana and NorthWestern have a sharing agreement that governs each party's responsibilities and rights relating to the operation of Colstrip Units 3 and 4. Under the terms of that agreement, each party is responsible for 15% of the total non-coal operating and construction costs of Colstrip Units 3 and 4, regardless of whether a particular cost is specific to Colstrip Unit 3 or 4, and is entitled to take up to the same percentage of the available generation from Units 3 and 4.

Kentucky Utilities Co [Member]
  
Jointly Owned Facilities [Line Items]  
Jointly Owned Facilities

14. Jointly Owned Facilities

 

(All Registrants except PPL Electric)

 

At December 31, 2013 and 2012, the Balance Sheets reflect the owned interests in the facilities listed below.

                Construction
     Ownership    Other Accumulated Work
     Interest Electric Plant Property Depreciation in Progress
PPL               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
  Trimble County Units 1 & 2  75.00%   1,288      144   54
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
  Trimble County Units 1 & 2  75.00%   1,279      112   43
 Merrill Creek Reservoir  8.37%    $ 22   15   

PPL Energy Supply               
 December 31, 2013               
 Generating Plants               
  Susquehanna  90.00% $ 4,686    $ 3,545 $ 76
  Conemaugh  16.25%   247      131   63
  Keystone  12.34%   207      91   2
 Merrill Creek Reservoir  8.37%    $ 22   16   
                  
 December 31, 2012               
 Generating Plants               
  Susquehanna  90.00% $ 4,628    $ 3,530 $ 65
  Conemaugh  16.25%   238      122   30
  Keystone  12.34%   206      82   3
 Merrill Creek Reservoir  8.37%    $ 22   15   

LKE                
 December 31, 2013               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 308    $ 42 $ 18
  Trimble County Unit 2  75.00%   980      102   36
                  
 December 31, 2012               
 Generating Plants               
  Trimble County Unit 1  75.00% $ 304    $ 33 $ 10
  Trimble County Unit 2  75.00%   975      79   33
                  
LG&E               
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      5   1
  Trimble County Unit 1   75.00%   308      42   18
  Trimble County Unit 2   14.25%   200      19   14
  Trimble County Units 5-6  29.00%   29      3   
  Trimble County Units 7-10  37.00%   69      7   1
  Cane Run Unit 7  22.00%            91
  Green River Unit 5  40.00%            1
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  38.00% $ 40    $ 5   
  Paddy's Run Unit 13 & E.W. Brown Unit 5  53.00%   46      3   
  Trimble County Unit 1   75.00%   304      33 $ 10
  Trimble County Unit 2   14.25%   198      14   13
  Trimble County Units 5-6  29.00%   29      2   
  Trimble County Units 7-10  37.00%   68      6   2
  Cane Run Unit 7  22.00%            16
                  
KU                
 December 31, 2013               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 11 $ 2
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      4   1
  Trimble County Unit 2   60.75%   780      83   22
  Trimble County Units 5-6  71.00%   70      8   
  Trimble County Units 7-10  63.00%   118      12   2
  Cane Run Unit 7  78.00%            317
  Green River Unit 5  60.00%            2
                  
 December 31, 2012               
 Generating Plants               
  E.W. Brown Units 6-7  62.00% $ 64    $ 7 $ 1
  Paddy's Run Unit 13 & E.W. Brown Unit 5  47.00%   42      2   
  Trimble County Unit 2   60.75%   777      65   20
  Trimble County Units 5-6  71.00%   70      4   
  Trimble County Units 7-10  63.00%   116      10   2
  Cane Run Unit 7  78.00%            53

Each subsidiary owning these interests provides its own funding for its share of the facility. Each receives a portion of the total output of the generating plants equal to its percentage ownership. The share of fuel and other operating costs associated with the plants is included in the corresponding operating expenses on the Statements of Income.

 

In addition to the interests mentioned above, at December 31, 2012, PPL Montana had a 50% leasehold interest in Colstrip Units 1 and 2 and a 30% leasehold interest in Colstrip Unit 3 under operating leases. In December 2013, PPL Montana terminated the operating lease arrangement and acquired these interests. See Note 8 for additional information. At December 31, 2013, the book value of the acquired assets was not significant. At December 31, 2013 and 2012, NorthWestern owned a 30% interest in Colstrip Unit 4. PPL Montana and NorthWestern have a sharing agreement that governs each party's responsibilities and rights relating to the operation of Colstrip Units 3 and 4. Under the terms of that agreement, each party is responsible for 15% of the total non-coal operating and construction costs of Colstrip Units 3 and 4, regardless of whether a particular cost is specific to Colstrip Unit 3 or 4, and is entitled to take up to the same percentage of the available generation from Units 3 and 4.