💻 Computers & Office
How Much Does a Cable Modem Cost to Run?
At the current U.S. average rate of 18.8¢/kWh (April 2026), a cable modem costs about $1.37 per month at typical usage — 24 hours/day (always on).
Per hour
0.2¢
at 6–15 W
Per day
4.5¢
24 hours/day (always on)
Per month
$1.37
7.3 kWh
Per year
$16.47
88 kWh
A cable or fiber modem adds another 6–15 always-on watts alongside the router. Combined home networking gear typically totals 20–40 watts of permanent draw — a small but genuinely constant bill floor.
Calculate it for your home
Per hour
0.2¢
Per day
4.5¢
Per month
$1.37
Per year
$16.47
Uses 7.3 kWh/month at 18.8¢ per kWh.
Cheapest and most expensive states
Monthly cost at typical usage, using each state's current average residential rate.
Cost in every state
| State | Rate (¢/kWh) | Per hour | Per month | Per year |
|---|---|---|---|---|
| North Dakota | 12.4 | 0.1¢ | $0.90 | $10.86 |
| Idaho | 12.7 | 0.1¢ | $0.93 | $11.13 |
| Nebraska | 13.3 | 0.1¢ | $0.97 | $11.65 |
| Oklahoma | 13.3 | 0.1¢ | $0.97 | $11.65 |
| Utah | 13.3 | 0.1¢ | $0.97 | $11.65 |
| Iowa | 13.9 | 0.1¢ | $1.01 | $12.18 |
| Montana | 13.9 | 0.1¢ | $1.01 | $12.18 |
| Missouri | 14.0 | 0.1¢ | $1.02 | $12.26 |
| Arkansas | 14.2 | 0.1¢ | $1.04 | $12.44 |
| Nevada | 14.3 | 0.1¢ | $1.04 | $12.53 |
| Louisiana | 14.4 | 0.1¢ | $1.05 | $12.61 |
| Washington | 14.4 | 0.1¢ | $1.05 | $12.61 |
| South Dakota | 14.5 | 0.1¢ | $1.06 | $12.70 |
| Wyoming | 14.7 | 0.1¢ | $1.07 | $12.88 |
| Tennessee | 14.9 | 0.1¢ | $1.09 | $13.05 |
| Kentucky | 15.0 | 0.1¢ | $1.09 | $13.14 |
| New Mexico | 15.2 | 0.2¢ | $1.11 | $13.32 |
| Florida | 15.4 | 0.2¢ | $1.12 | $13.49 |
| Georgia | 15.4 | 0.2¢ | $1.12 | $13.49 |
| Arizona | 15.5 | 0.2¢ | $1.13 | $13.58 |
| Kansas | 15.8 | 0.2¢ | $1.15 | $13.84 |
| Oregon | 15.8 | 0.2¢ | $1.15 | $13.84 |
| West Virginia | 16.1 | 0.2¢ | $1.17 | $14.10 |
| North Carolina | 16.3 | 0.2¢ | $1.19 | $14.28 |
| Minnesota | 16.4 | 0.2¢ | $1.20 | $14.37 |
| Colorado | 16.5 | 0.2¢ | $1.20 | $14.45 |
| Mississippi | 16.8 | 0.2¢ | $1.23 | $14.72 |
| Texas | 17.0 | 0.2¢ | $1.24 | $14.89 |
| South Carolina | 17.1 | 0.2¢ | $1.25 | $14.98 |
| Alabama | 17.4 | 0.2¢ | $1.27 | $15.24 |
| Virginia | 17.4 | 0.2¢ | $1.27 | $15.24 |
| Indiana | 17.9 | 0.2¢ | $1.31 | $15.68 |
| Delaware | 18.8 | 0.2¢ | $1.37 | $16.47 |
| Wisconsin | 19.2 | 0.2¢ | $1.40 | $16.82 |
| Ohio | 19.5 | 0.2¢ | $1.42 | $17.08 |
| Illinois | 20.5 | 0.2¢ | $1.50 | $17.96 |
| Michigan | 21.4 | 0.2¢ | $1.56 | $18.75 |
| Pennsylvania | 21.5 | 0.2¢ | $1.57 | $18.83 |
| Maryland | 22.1 | 0.2¢ | $1.61 | $19.36 |
| New Jersey | 23.5 | 0.2¢ | $1.71 | $20.59 |
| Vermont | 24.6 | 0.2¢ | $1.79 | $21.55 |
| Washington, D.C. | 25.4 | 0.3¢ | $1.85 | $22.25 |
| New Hampshire | 27.2 | 0.3¢ | $1.98 | $23.83 |
| Alaska | 27.4 | 0.3¢ | $2.00 | $24.00 |
| Rhode Island | 28.3 | 0.3¢ | $2.06 | $24.79 |
| Maine | 28.4 | 0.3¢ | $2.07 | $24.88 |
| Massachusetts | 29.5 | 0.3¢ | $2.15 | $25.84 |
| New York | 29.5 | 0.3¢ | $2.15 | $25.84 |
| Connecticut | 32.2 | 0.3¢ | $2.35 | $28.21 |
| California | 35.3 | 0.4¢ | $2.58 | $30.92 |
| Hawaii | 46.6 | 0.5¢ | $3.40 | $40.82 |
How to lower the cost
- Enable sleep after 15–20 minutes of idle — modern machines wake in seconds.
- Anything always-on (servers, mining, chargers on strips) deserves a smart plug and a schedule.
- Laptops do the same office work as desktops on a quarter of the power.
Frequently asked questions
How much electricity does a cable modem use?
A typical cable modem draws about 10 watts in use. At 24 hours/day (always on), that works out to roughly 0.2 kWh per day, or 7.3 kWh per month.
How much does it cost to run a cable modem for 1 hour?
At the current U.S. average residential rate of 18.8¢/kWh, one hour costs about 0.2¢. In North Dakota (12.4¢/kWh) it's 0.1¢, while in Hawaii (46.6¢/kWh) it's 0.5¢.
How much does a cable modem cost to run per month?
With typical usage (24 hours/day (always on)), expect about $1.37 per month at the U.S. average rate — from $0.90 in North Dakota up to $3.40 in Hawaii. Rates are as of April 2026.
Does a cable modem use a lot of electricity?
Not really — at typical usage it's under 1% of an average home's monthly consumption. Heating, cooling, hot water, and drying are the loads that move bills.