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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2023
Asset Retirement Obligations [Abstract]  
Asset Retirement Obligations
26.
 
ASSET RETIREMENT OBLIGATIONS
AROs mostly relate to reclamation of land at the thermal, hydro and combustion turbine sites; and the
disposal of polychlorinated biphenyls in transmission and distribution equipment and a pipeline site.
Certain hydro, transmission and distribution assets may have additional AROs that cannot be measured
as these assets are expected to be used for an indefinite period and, as a result, a reasonable estimate of
the FV of any related ARO cannot be made.
The change in ARO for the years ended December 31 is as follows:
millions of dollars
2023
2022
Balance, January 1
$
 
174
$
 
174
Accretion included in depreciation expense
 
9
 
9
Change in FX rate
(1)
 
3
Additions
-
 
 
1
Accretion deferred to regulatory asset (included in PP&E)
 
18
 
1
Liabilities settled
(8)
(1)
Revisions in estimated cash flows
-
 
(13)
Balance, December 31
$
 
192
$
 
174