alternate
alternator
auto
auxiliary
backup
battery
conditioner
current
data
device
diesel
electric
electrical
electricity
emergency
energy
engine
equipment
external
fuel
generation
generator
high
house
industrial
industry
input
internet
interruption
mechanical
power
powerful
problems
protected
server
service
source
stack
standby
supply
support
surges
technology
telecommunication
uninterrupted
unit
ups
utility
volt
voltage