Home energy monitor
A home energy monitor is a device that provides information about a personal electrical energy usage to a consumer of electricity. Devices may display the amount of electricity used, plus the cost of energy used and estimates of greenhouse gas emissions. The purpose of such devices is to assist in the management of power consumption. Several initiatives has been launched to increase the usage of home energy monitors. Studies have shown a reduction of home energy when the devices are used.

Description 

A home energy monitor device provides information about electrical energy usage to a consumer of electricity (i.e., a homeowner). In addition to the amount of electrical usage, devices may display other information, including the cost of energy used and estimates of greenhouse gas emissions. The purpose of such devices is to assist in the management of power consumption.

Monitors consist of a measuring component and a display component. Electricity use is measured with an inductive clamp placed around the electric main, via the electric meter (either through an optical port, or by sensing the meters actions), by communicating with a smart meter, or by direct connection to the electrical system.

The display portion may be remote from the measurement, communicating with the sensor using a cable, network, power line communications, or using radio. Online displays are also available which allow the user to use an internet connected display to show near real-time consumption.

Initiatives

Australia 
In January 2009 the government of the state of Queensland, Australia began offering wireless energy monitors as part of its ClimateSmart Home Service program.  By August 2009, almost 100,000 homes had signed up for the service, by August 2010 that number had risen to 200,000 homes. By the end of the program more than 335,000 households across Queensland had received the service with the Elite energy monitoring device supplied by Efergy Technologies.

In mid-2013 the government of the state of Victoria, Australia enabled Zigbee-based In-Home Displays to be connected to Victorian Smart Meter. From September 2019, the Victorian households are eligible to avail rebates for home energy monitor installation under the Victorian Energy Upgrades Program.

Google PowerMeter 

Google PowerMeter was a software project of Google's philanthropic arm, Google.org, to help consumers track their home electricity usage. It was launched on October 5, 2009 and ended on September 16, 2011.

Studies
Various studies have shown a reduction in home energy use of 4-15% through use of home energy display.

A study using the PowerCost Monitor deployed in 500 Ontario homes by Hydro One showed an average 6.5% drop in total electricity use when compared with a similarly sized control group. Hydro One subsequently offered free power monitors to 30,000 customers based on the success of the pilot. According to World Economic Forum 2022, Google supports some companies around the world in different segments. Blue Line Innovations also indicates 100,000 units in the market today.

Another study carried out in the city of Sabadell (Spain) in 2009 using the Efergy e2 in 29 households during a six-month period came to 11.8% on a weekly comparison between the first and last weeks of the campaign. On a monthly basis, the savings were 14.3%. Expected annual  savings for all households is estimated to be 4.1 tonnes; projected  emissions savings for 2020 are 180.6 tonnes.

See also

 AlertMe
 Energy management software
 Google PowerMeter
 Energy conservation
 Hohm
 Home automation
 Kill A Watt
 Nonintrusive load monitoring
 Smart meter
 Wattmeter

References

External links
 gov.uk Saving electricity with a home energy monitor

Electric power
Electricity meters