You should only need to specify the minimum day for shutoff. Below would be nice.
# PUBLIC UTILITIES SETTINGS
############################
# WATER
# The day to start checking for water system failure: 0 - 2147483647 (Default: 14)
# To simulate water never shutting off use a really big number.
WaterStartDay=14
# The initial chance for water shut off beginning on WaterStartDay: 0 - 100 (Default: 25)
WaterOffChance=25
# How many days before the WaterOffChance percentage is increased by the WaterIncreasePercentage
WaterIncreaseDays=10
# The amount which the percentage chance for shut off should increase every WaterIncreaseDays
WaterIncreasePercentage=5
# ELECTRICITY
# The day to start checking for electrical power system failure: 0 - 2147483647 (Default: 14)
# To simulate electrical system power never shutting off use a really big number.
PowerStartDay=14
# The initial chance for power shut off beginning on PowerStartDay: 0 - 100 (Default: 25)
PowerOffChance=25
# How many days before the PowerOffChance percentage is increased by the PowerIncreasePercentage
PowerIncreaseDays=10
# The amount which the percentage chance for shut off should increase every PowerIncreaseDays
PowerIncreasePercentage=5
# TELECOM / INTERNET (See: https://en.wikipedia.org/wiki/CompuServe )
# The day to start checking for the "internet" (and telephone lines) to shut down.
# EXAMPLE:
# If you set the StartDay to 0, and leave the rest at their default, you would get a progression like this:
# DAY | PERCENTAGE FOR SHUT OFF
# 00 | 25%
# 10 | 30%
# 20 | 35%
# 30 | 40%
# 40 | 45%
# 50 | 50%
# 60 | 55%
# 70 | 60%
# 80 | 65%
# 90 | 70%
# 100 | 75%
# 110 | 80%
# 120 | 85%
# 130 | 90%
# 140 | 95%
# 150 | 100% (system shuts off on day 150 at the latest)