FortisBC Inc. (FortisBC) Application for a Certificate of Public ...

etirement activity will likely be similar to the historic levels. As such, the currently approved
Iowa 50-R3 has been modified to 60-R3 for this account which provides a reasonable
interpretation of the historical retirement experience and recognizes the expectation that
future retirements will occur in a similar pattern as the historic retirement activity.
Account 335.00 - Generation Plant - Other Power Plant Equipment, represents 3%
of the depreciable plant studied. The retirements, additions and other plant transactions for
the period 1960 through 2009 were analyzed by the retirement rate method. This account
consists mainly of the Transmission conductor, and related material required for the electric
transmission of electricity. As indicated in the original survivor curve as plotted at page IV-
26, this account has witnessed only limited amounts of retirement activity within the
experience band analyzed. Discussions with management and company staff indicate that
further retirement activity will likely be similar to the historic levels. As such, the Iowa curve
45-R4 is recommended for this account as it provides a reasonable interpretation of the
historical retirement experience and recognizes the expectation that future retirements will
occur in a similar pattern as the historic retirement activity.
Appendix BCUC IR1 69.4
Account 334.00 - Generation Plant - Accessory Electrical Equipment, represents 2%
of the depreciable plant studied. The retirements, additions and other plant transactions for
the period 1960 through 2009 were analyzed by the retirement rate method. As indicated
in the original survivor curve as plotted at page IV-14, this account has witnessed some
retirement activity within the experience band analyzed. Retirements in this account have
begun at a relatively early age with more significant amount of retirements from ages 12 to
24. Discussions with management and company staff indicate that further retirement
activity will likely be similar to the historic levels. The currently approved Iowa 45-R2.5 has