Running cost comes down to wattage, hours and your rate. In District of Columbia the rate is 25.40 cents per kWh, which is 37.7 percent above the national average. Here is what that means for a dishwasher.
A dishwasher drawing 1,800 W costs $0.46 per hour in District of Columbia. Run 1 hours a day that is $0.46 daily, $13.72 a month and $167 a year, which is $45.73 more than the same appliance at the US average rate.
Dishwasher cost at District of Columbia rates
Change any box. The result updates as you type.
Planning estimate. The rate box is prefilled with a regional average; the figure on your own bill is the one that matters. Power is draw while running, not while switched on.
Cost by hours used per day in District of Columbia
| Hours/day | Energy | Per day | Per month |
|---|---|---|---|
| 1 h | 1.80 kWh | $0.46 | $13.72 |
| 2 h | 3.60 kWh | $0.91 | $27.43 |
| 4 h | 7.20 kWh | $1.83 | $54.86 |
| 6 h | 10.80 kWh | $2.74 | $82.30 |
| 8 h | 14.40 kWh | $3.66 | $110 |
| 12 h | 21.60 kWh | $5.49 | $165 |
| 24 h | 43.20 kWh | $10.97 | $329 |
Cost by wattage at 25.40 cents
| Rated power | Per hour | Per day | Per month |
|---|---|---|---|
| 1,200 W | $0.30 | $0.30 | $9.14 |
| 1,500 W | $0.38 | $0.38 | $11.43 |
| 1,800 W | $0.46 | $0.46 | $13.72 |
| 2,100 W | $0.53 | $0.53 | $16.00 |
| 2,400 W | $0.61 | $0.61 | $18.29 |
Find the row matching the nameplate on your own unit. Within a single appliance category the spread is often wider than the difference between categories, so the label is worth reading.
What actually varies by state
Dishwasher cycles run much the same regardless of climate; the wattage and cycle length barely change between District of Columbia and anywhere else. What genuinely differs here is the electricity rate itself, which is why this page exists at all rather than a single national figure.
Why District of Columbia pays what it does
District of Columbia has a competitive retail electricity market, so the rate used here blends households on the utility default with households on shopped supply plans. If you have never switched supplier you are probably on the default, which is usually the more expensive side of that blend. Only the generation portion of your bill changes when you switch; delivery and outage response do not.
At 25.40 cents, District of Columbia ranks 42 of 51 from cheapest to most expensive. The Northeast regional average is 25.91 cents. Roughly half of any residential bill is transmission and distribution rather than generation, which is why rates keep climbing even when fuel prices fall.
How this compares across the country
The same dishwasher on the same schedule, in the cheapest and dearest states:
| State | Rate | Per month | Per year |
|---|---|---|---|
| Idaho | 12.35¢ | $6.67 | $81.14 |
| Utah | 12.96¢ | $7.00 | $85.15 |
| District of Columbia | 25.40¢ | $13.72 | $167 |
| California | 33.25¢ | $17.96 | $218 |
| Hawaii | 52.00¢ | $28.08 | $342 |
Lowering the number in District of Columbia
- Turn off heated dry. The single largest discretionary energy use in the cycle.
- Run full loads. The machine heats roughly the same amount of water whether half full or full.
- Skip the pre-rinse. Rinsing under a hot tap can use more hot water than the dishwasher cycle itself.
- Use the eco cycle for anything not urgent. Longer and cooler, and it uses less energy despite the extra time.
Offsetting it with solar in District of Columbia
This load uses about 1.80 kWh a day. Covering that would take roughly 2 standard 400 W panels at typical sun hours, an array of about 0.80 kW. Because it offsets electricity worth 25.40 cents rather than the national 18.44 cents, the same array is worth more here than the national payback figures suggest.
Most of the load is the heating element, which is steady and predictable. Running the cycle at midday is the whole strategy. Full sizing, including battery and inverter requirements, is on the solar sizing page for this appliance.