Electric Vehicles

Residential Rates

Many electric vehicle owners do most charging at home under one of several rate options. A customer may stay with the current residential rate and pay the same amount for energy no matter what time of day it is used. Or, a customer may elect to participate in time-of-use (“TOU”) rates and pay for energy based upon when it is used during the day.

In October 2016, the Hawaiian Electric Companies introduced the TOU-RI rate as instructed by the Hawaii Public Utilities Commission. This rate provides the lowest price for energy used from 9 a.m. to 5 p.m. but higher rates from 5 p.m. to 10 p.m. Customers may use this TOU rate for all residential uses or have an electrician install wiring and have separate TOU utility service just for electric vehicle charging.

Note: An earlier TOU rate for electric vehicle charging (Schedule TOU EV) that began in 2010 provided a lower price for energy used overnight hours. TOU EV was closed to new enrollments in September 2016, but customers currently enrolled may stay on rate TOU EV.

The EV WattPlan online tool can be used to compare costs of EV ownership.


Schedule R

Most residential households are on Schedule R with a price that remains constant throughout the day. Under this option, energy for household use and electric vehicle charging is measured using your current meter with the same cost per kilowatt-hour, no matter the time of day.

You need to do nothing if you wish to remain on Schedule R.


Schedule TOU-RI

Residential customers may be able to save money using the new time-of-use rates that are lowest during midday, when solar and other renewable energy is most abundant. Under TOU-RI, customers pay more during the priority peak.

Enrollment is available for up to 5,000 residential customers across the three Hawaiian Electric Companies, whether or not the customer has an electric vehicle. Visit our TOU-RI page for additional information and enrollment. Rates vary island by island and month to month, but the following chart shows typical differences between the residential rate and a sample TOU-RI rate.

Interim TOU-RI Schedule Graph - Daily (Approximate Differentials)

Option 1: TOU-RI for the whole-house

Residential customers may elect to have their household billed under TOU-RI, whether or not they own an electric vehicle. Under this option, customers on TOU-RI pay the lowest price for energy for all their household use, and electric vehicle charging if they have one, between 9 a.m. and 5 p.m. daily. The rate is higher from 5 p.m. to 10 p.m.

Option 2: TOU-RI, separately metered for electric vehicle charging only

Residential customers may sign up for the time-of-use rate just for electric vehicle but keep the rest of their household use under their existing residential rate. The customer will need a licensed electrician to work with the utility to install new service for electric vehicle charging only. This work requires a city building permit and after the work is done and the permit approved, the utility will install a new TOU-RI meter. Customers considering this option should contact the GoEV Team at 808-543-4638 (GoEV) or GoEV@hawaiianelectric.com.


Schedule TOU EV

The TOU EV begun in 2010 was closed to new enrollments in September 2016 but customers currently enrolled may stay on rate TOU EV. If a TOU EV customer chooses to leave TOU EV it will not be possible to reenroll. If you are enrolled in TOU EV you may review your rate here.


Rate comparisons are summarized below.

 Schedule R Schedule TOU-RI For Whole-House Schedule TOU-RI For EV Charging Only 
Description Household and EV charging rate remains constant around the clock. Household and EV charging is cheapest during the mid-day. EV charging through a separate meter is cheapest during the mid-day. Household use remains under the existing rate.
Current Status Open Open to 5,000 residential customers total Open to 5,000 residential customers total
Electric Meter Current meter measures household use and EV charging. Single TOU-RI meter measures household use and EV charging. Separate TOU-RI meter measures EV charging only. Household use is measured by existing meter.
Off-Peak Rate Not applicable.
Rate is the same throughout the day.
Slightly lower than residential rate from 10 pm to 9 am daily. Slightly lower than residential rate for EV charging from 10 pm to 9 am daily.
Mid-Peak or Midday Rate Not applicable.
Rate is the same throughout the day.
Lower than residential rate from 9 am to 5 pm daily. Lower than residential rate for EV charging from 9 am to 5 pm daily.
Priority Peak or On-Peak Rate Not applicable.
Rate is the same throughout the day.
Higher than residential rate from 5 pm to 10 pm daily. Higher than residential rate for EV charging from 5 pm to 10 pm daily.
Advantages For customers unable to shift electric use to daytime, electricity cost is the same all day. NEM credits apply to all residential use including EV charging. Lower rates for household and EV charging during daytime. The more electrical use shifted to daytime, the greater the savings. Lower rates for EV charging during mid-day time. The more charging that can be shifted to mid-day, the greater the savings.
Disadvantages No discount for electricity used during daytime when solar and other renewable energy is most abundant. Higher rates for electric use during peak hours.
Customers with little daytime electric use see little or no savings.
Customers with PV generating excess energy during the day may see little or no savings.
Higher rates for EV charging during peak hours.
Household electric use is not eligible for lower daytime. Household NEM credits cannot be applied to separate EV charging.
Fixed Customer Charge Same as Schedule R Additional Customer Charge for new separate service.
Enrollment Requirements Standard enrollment for residential service. Enrollment for TOU-RI rate. EV ownership, building permit for new EV service closed and enrollment for TOU-RI rate. Customer must install second service.
Detailed Rate
Schedule Information
Schedule R Schedule TOU-RI Schedule TOU-RI

Residential: Getting started

Step 1: Understand your rate options > Rates
Step 2: Understand the enrollment process > Residential-Family Dwelling or Multi-Unit Dwelling

Commercial: Getting started

Step 1: Understand your rate options > Rates
Step 2: Understand the enrollment process > Commercial Facility
Step 3: Submit an enrollment form > Form