smart thermostats and to consumers. The signals to smart
thermostats would be sent using the advanced metering
infrastructure (AMI) communication network and a second
communication network commonly referred to as the home
area network (HAN). Using these two communication
networks, a utility would be able to exchange information
with smart thermostats, and the goal was to reduce energy use
for air conditioning during times of high demand for
electricity. The consumer would be notified of pricing either
on an exception basis (e.g., when prices were high) or daily
using other communication channels such as email, text, and
automated phone calls. Many industry dynamic pricing
studies have shown that including automation of demand
response for large loads, such as central air conditioning,
increases the load reduction that residential consumers are
able to achieve and makes it more convenient for consumers
[1] and [2]. This type of automation often makes use of
sophisticated algorithms to cycle the air conditioning to
achieve the load reduction while maintaining comfortable
temperatures within the home.
Over time, as utilities, policy makers, and other stakeholders
considered the appropriate role for utilities behind the meter,
more extensive scenarios began to unfold. It might be
possible using the HAN to exchange information with other
large loads, such as pool pumps, electric heaters, dryers, and
refrigerators. Images of homes with HANs with ten or more
devices began to appear on utility websites and in
presentations at conferences. New devices were developed,
such as in-home display devices, which were portable devices
that consumers could use to see energy use in near real time,
and at conferences, huge screens showed customer energy use
and cost refreshed every few seconds. Regulators and
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