Smartphone Charger in Honolulu — $9/yr to Run (42.5¢/kWh)
Your smartphone charger in Honolulu costs about $1/month at 42.5¢/kWh. See daily, monthly, and yearly costs, plus tips to cut your bill.
Honolulu, HI Electricity Rate
42.5¢/kWh
Utility: Hawaiian Electric (HECO)
+227% vs national avg
National avg: 13.0¢/kWh
Daily Cost
$0.03
0.1 kWh/day
Monthly Cost
$0.78
2 kWh/mo
Annual Cost
$9
22 kWh/yr
Lifetime (3yr)
$28
energy only
Monthly Cost Breakdown in Honolulu
| Period | kWh | Honolulu Cost | National Avg | Difference |
|---|---|---|---|---|
| Daily | 0.1 | $0.03 | $0.01 | +$0.02 |
| Weekly | 0.4 | $0.18 | $0.05 | +$0.12 |
| Monthly | 1.8 | $0.78 | $0.24 | +$0.54 |
| Quarterly | 5.5 | $2.33 | $0.71 | +$1.62 |
| Annual | 21.9 | $9.32 | $2.85 | +$6.47 |
Customize Your Smartphone Charger Cost
Adjust usage hours and electricity rate to calculate your exact cost in Honolulu.
Daily
$0.03
Monthly
$0.78
Annual
$9
3-Year
$28
Energy Saving Tips for Smartphone Charger in Honolulu
- ✓Honolulu electricity rates are 227% above the national average — energy efficiency matters more here.
- ✓Unplug charger when not in use
- ✓Use original or certified chargers
- ✓Avoid overnight charging
Highest-Cost Appliances in Honolulu, HI
See which appliances cost the most to run at Honolulu's 42.5¢/kWh electricity rate.
Level 2 EV Charger (240V)
Transportation · 7,200W
$5,513/yr
$459.43/mo
Electric Furnace
HVAC · 10,000W
$3,829/yr
$319.05/mo
Electric Tankless Water Heater
Water Heating · 18,000W
$2,795/yr
$232.91/mo
EV Charger (Level 2)
Garage · 7,200W
$2,757/yr
$229.72/mo
Boiler (Electric)
HVAC · 6,000W
$2,297/yr
$191.43/mo
Electric Water Heater (Tank)
Water Heating · 4,500W
$2,096/yr
$174.68/mo
Water Heater (Tank Electric)
Water Heating · 4,500W
$2,096/yr
$174.68/mo
Heat Pump
HVAC · 2,400W
$1,634/yr
$136.13/mo
Smartphone Charger Cost in Other Hawaii Cities
| City | Rate | Annual Cost | vs Honolulu |
|---|---|---|---|
| Honolulu (current) | 42.5¢ | $9 | — |
| Maui | 41.5¢ | $9 | $-0 |
Smartphone Charger Energy Cost FAQ — Honolulu, HI
Understanding Smartphone Charger Energy Costs in Honolulu, HI
Honolulu is a mid-sized Hawaii city where residential electricity rates from Hawaiian Electric (HECO) are shaped by regional energy supply and local demand patterns. Running a low-draw appliance like the Smartphone Charger (20W) at Honolulu's rate of 42.5¢/kWh costs approximately $9 per year — $6 more than the national average of $3.
Electricity in Honolulu is significantly more expensive than the national average — 227% higher. For a Smartphone Charger used 3 hours per day, this rate premium adds up to $6 in extra annual costs. Energy-efficient models and usage habits have an outsized impact in high-rate markets like this.
Honolulu has a high cost of living (index: 193), which means electricity is just one of many above-average expenses. Reducing appliance energy costs — even by small amounts — contributes to meaningful household savings in this market. Since no ENERGY STAR or smart version is currently available for this appliance, reducing usage hours is the primary way to cut costs.
In Honolulu's warm climate (avg 83.7°F), HVAC-related appliances tend to run more frequently, compounding energy costs. A Smartphone Charger produces approximately 0.02 tons of CO2 annually at typical usage. Honolulu residents can reduce this footprint by optimizing usage patterns, or investing in solar — see our solar savings calculator for Honolulu.
Compare All Energy Costs in Honolulu
See energy costs for 178+ household appliances at Honolulu's local electricity rate.
Frequently Asked Questions
How much does it cost to run a Smartphone Charger in Honolulu, HI?
At Honolulu's average electricity rate of 42.5¢/kWh, a Smartphone Charger costs approximately $9 per year to run. That's about $0.78 per month with typical usage of 3 hours per day.
What is the electricity rate in Honolulu, HI?
The average residential electricity rate in Honolulu, HI is 42.5¢/kWh, which is 227% above the national average of 13.0¢/kWh. The primary utility provider is Hawaiian Electric (HECO).
How much electricity does a Smartphone Charger use per year?
A Smartphone Charger uses approximately 20 watts and consumes about 22 kWh per year with typical usage of 3 hours/day for 365 days/year.
Is a Smartphone Charger expensive to run in Honolulu?
Compared to the national average cost of $3/year, running a Smartphone Charger in Honolulu costs $6 more per year due to higher local electricity rates.
How can I reduce my Smartphone Charger energy cost in Honolulu?
To reduce Smartphone Charger costs in Honolulu: Unplug charger when not in use. Use original or certified chargers. Consider using a smart plug to monitor and optimize usage. Also check with Hawaiian Electric (HECO) for local energy efficiency rebates and programs.