The Costs of Energy

from CD 2023 April enchantment

by New Mexico Rural Electric Cooperatives

Understanding how power works can help you save

Use these formulas to calculate your energy use and projected costs.

Calculate Energy Consumption:

Power x Time = Energy

Example: Using a 100-watt bulb for 10 hours equals 1 kWh. (100 watts x 10 hours = 1,000 watt-hours or 1 kilowatthour.)

Calculate Energy Costs: is equivalent to 1,000 watts. A kilowatthour (kWh) is a measurement of energy consumption. It is the amount of power used over time and the basis for how electric bills are calculated.

Power (kW) x Time (hours of operation) x Price ($/kWh) = Cost of operation.

Follow these ﬁve easy steps to determine how much it may cost to run a speciﬁc appliance. You are billed per kWh, or for how much electricity you use in one hour. Examples are based on an average cost of $0.144 per kWh.

1) Obtain the wattage (watts) from the appliance nameplate.

Example: A space heater with a nameplate of 1,500 watts. Note: If listed as kW, skip to step 3. If amps are speciﬁed, multiply amps x voltage to obtain watts.

2) Divide the number of watts by 1,000 to get kW.

Example: 1,500 W ÷ 1,000 = 1.5 kW.

• Amperes (amp): The measure of how much electricity moves through a conductor. Amperes equal watts divided by volts. A typical household electrical outlet is 15 amps.

See above to learn how to calculate your energy use and projected costs.

Phantom Power

According to the Energy Information Agency, the typical U.S. household uses more air conditioning, appliances and consumer electronics than ever before. The average home contains 10 or more internet-connected devices.

There are many small ways to save energy, such as turning off the lights, ceiling fan or TV when you leave the room. A more encompassing way to save energy is to reduce phantom power.

Even when turned off, most electronics consume a small amount of electricity if they are still plugged in. Chargers for mobile devices consume electricity if they are plugged in, even when not actively charging the device.

3) To ﬁnd out how many kWh the appliance uses, multiply the kW times the number of hours* the appliance runs each day.

Example: The heater runs for 10 hours per day = 1.5 kW x 10 hours = 15 kWh per day.

*If the appliance operates for less than one full hour, divide the number of minutes by 60. Example: a hair dryer is used ﬁve minutes daily, or 5 ÷ 60 = 0.083 hours per day. A 1,250watt hair dryer = 1.25kW x 0.083 hours per day = 0.1 kWh per day.

4) To calculate the daily operating cost, multiply the kWh of the appliance by the average cost per kWh.

Example: Space heater daily cost = 15 kWh x $0.144 = $2.16 per day.

5) To calculate the monthly operating cost, multiply the daily cost by the number of days the appliance is used during the month.

Example: If you run the 1,500-watt space heater 10 hours a day, 30 days a month = 15 kWh x $0.144 x 30 = $64.80.

This wasted energy, called phantom load, accounts for as much as 10% of a home’s total electric use.

Save money by unplugging your electronics when you are done using them. Using a power strip can help you unplug multiple devices at once. Smart power strips automatically cut off phantom loads.

Another way to combat phantom power is with the use of smart plugs. Smart plugs are inexpensive and can be used to control items through a smartphone app.

With smart plugs, you can manage lighting, home office equipment and video game consoles.

Large Appliance Use

The combined use of large appliances such as dishwashers, dryers and washing machines account for the largest percentage of electricity use in the average U.S. home. Small steps will help save energy when using these appliances.

Only run full loads in the dishwasher, and thoroughly scrape food from dishes before loading. Dry towels and heavier cottons separate from lighter-weight clothing, and clean the lint screen after every use. Wash clothing in cold water to save energy used to heat water.

Lightbulbs

You can’t talk about saving energy without considering lightbulbs.

Switching from incandescent bulbs to LED smart bulbs can help save energy and money over the long run, despite a higher initial cost. LEDs come in a variety of colors and brightness levels, lasting 15 to 25 times longer than incandescent bulbs.

As we switch to more-efficient bulbs, we must change how we shop for them.

In the past, we selected lightbulbs based on wattage. But wattage indicates how much power is used rather than the bulb’s brightness.

The term to learn is lumens. Lumens measure the amount of light produced by the bulb. Use lumens to compare the brightness of any bulb.

Once you know the brightness you need, you can shop wisely and get the most for your money.

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