Molly Ayala
Electricity usage is a topic that has gained prominence in recent years, with the modern home using a lot of electricity to power a variety of devices, from lights and appliances to technology like phones, routers, and smart speakers. There are various ways to measure electricity usage, from smart meters that allow utility companies to check your usage remotely, to plug-in power meters that can be used to measure the electricity consumption of individual devices. Understanding electricity usage can help consumers save money and identify areas where they can reduce their consumption.
| Characteristics | Values |
|---|---|
| Method | Smart meters, electricity usage monitors, power meters, energy monitors, sub-meters, manual calculations |
| Data measured | Kilowatt-hours (kWh), watts, power, energy, voltage, amperes |
| Data source | Readings from meters and monitors, appliance information, usage logs |
| Cost | Smart meters: $25/month for non-AMR/AMI meters; Electricity usage monitors: $25-$50; Energy monitoring devices: $99-$349 |
| Installation | Self-installed or by an electrician |
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Smart meters
While smart meters offer advantages, some individuals have expressed concerns about data security, health impacts, and the potential for utility companies to control their electricity supply. However, smart meter data is transmitted securely, and there is no evidence of adverse health effects from radio transmissions. Regarding control, smart meters do not control the electricity supply but provide information that can be used to influence energy usage patterns.
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Usage estimates
There are several ways to estimate electricity usage. One way is to use an electricity usage monitor, which can be purchased at most hardware stores for around $25-$50. These monitors are easy to use and can measure the electricity usage of any device that runs on 120 volts. To use a usage monitor, simply plug the monitor into an electrical outlet and then plug the device into the monitor. The monitor will then display how many watts the device is using. To find out how many kilowatt-hours (kWh) of electricity the device uses in an hour, a day, or longer, you can leave everything set up and read the display after the desired amount of time has passed.
Another way to estimate electricity usage is to calculate the annual energy consumption of a product and the cost to operate it. This can be done by first estimating the number of hours per day an appliance runs. This can be done by making a rough estimate based on how much you use the appliance each day, or by keeping a log of usage for certain appliances. Once you have the estimated number of hours per day, you can use the formulas provided by the Department of Energy to calculate annual energy consumption and costs.
Additionally, for larger appliances such as clothes dryers and electric cooktops, which use 240 volts, the amperes might be stamped on the unit in place of the wattage, or listed in the owner's manual or specification sheet. You can also use online sources to find typical wattages or the wattage of specific products. The Home Energy Saver, for example, provides a list of appliances with their estimated wattage and their annual energy use.
Finally, smart meters are another way to check electricity usage. Smart meters allow electric companies to check your usage from the street or over otherwise connected infrastructure. They send out a consumption read every few minutes, which can be used to build a usage profile. While some people believe that smart meters are an invasion of privacy or a way for companies to control their electricity, others argue that they are a critical component of grid modernization and resiliency.
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Plug-in power meters
These power meters are compatible with most appliances, but some high-powered devices such as air conditioners or electric heaters may exceed the capacity of certain models of power meters. Therefore, it is important to check the specifications before use.
The cost of plug-in power meters varies, with some basic models available for as little as $15, while more advanced models with additional features can range from $299 to $349.
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Energy monitors
Whole-home energy monitors are small devices installed in the circuit breaker panel of a house or apartment. They provide load disaggregation, which means they can trace which devices in your home are drawing power and how much they're drawing. This gives you more detailed information on your household's energy consumption than a typical monthly electricity bill.
Some energy monitors use machine learning to identify individual appliances and their electricity usage, while others rely on smart devices and direct observations to measure how much power individual circuits are using.
It's worth noting that the increasing integration of smart technologies into homes may soon render whole-home energy monitors obsolete. Smart devices, such as smart outlets, plugs, and appliances, can often report and limit their energy use, and smart electrical panels can monitor an entire home and let you control and schedule individual circuits' usage.
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Sub-meters
A sub-metering system typically includes a "master meter" owned by the utility company supplying water, electricity, or gas. This master meter records the overall usage, which is then billed directly to the property owner. The property owner or manager can then install their own sub-meters on individual tenant spaces to measure each tenant's utility usage and bill them accordingly.
In the context of electricity usage, sub-meters can measure electrical consumption in kilowatt-hours (kWh). This data can be used to calculate the cost of electricity consumed by each tenant, providing a more accurate billing system than simply dividing the utility usage among tenants equally or by square footage.
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Frequently asked questions
Electric companies use smart meters to check electricity usage from the street or over otherwise connected infrastructure.
You can check your electricity usage by installing an electricity usage monitor, which can measure the electricity usage of any device that runs on 120 volts.
Plug the monitor into an electrical outlet, and then plug your device into the monitor. The monitor will display how many watts the device is using.
