Hawaii Electricity Emission Factor 2023

EPA eGRID2023 Rev2 · 2 eGRID subregions · Very Dirty

Hawaii's electricity grid has a CO₂e emission factor of 1316.1 lb/MWh (0.5970 kg/kWh) - 71% dirtier than the US average. The grid is 24% carbon-free and 24% renewable. These are the official EPA eGRID2023 values used for GHG Protocol Scope 2 location-based emissions reporting.

1316.1

lb CO₂e / MWh

0.5970

kg CO₂e / kWh

24%

Carbon-free

24%

Renewable

eGRID Subregions in Hawaii

Hawaii spans 2 eGRID subregions. Use the ZIP-level API to get the exact factor for each facility.

Subregion	Name	lb CO₂e/MWh	kg/kWh	Carbon-free	Rating
HIOA	Hawaii Oahu	1498.947	0.6799	14.2%	Very Dirty
HIMS	Hawaii Miscellaneous	1133.294	0.5141	34.17%	Very Dirty

Generation Mix

Solar7.4%

Wind4.3%

Biomass2.5%

Oil83.1%

Other Fossil2.7%

Generation mix shown for HIOA (primary subregion). See subregion pages for full breakdowns.

Electricity cost in Hawaii

Latest monthly state-level average rate (EIA Form 861, 2026-04):

Sector	$/kWh
Residential	$0.4662
Commercial	$0.4299
Industrial	$0.3829
All sectors	$0.4225

State-level averages, not utility-specific tariffs. For exact pricing, check your utility's published rate schedule.

Derived metrics for Hawaii

Carbon cost of electricity: $686 per tonne CO₂e (residential rate ÷ grid intensity)
Annual per-capita CO₂e from electricity: 4,447 kg/yr (6.5k kWh × grid factor)
10,000 mi/yr EV emissions: 2040 kg CO₂e (at 0.30 kWh/mi)
Same miles in gas car: ~4,000 kg CO₂e (400 g/mi baseline)
EV vs gas savings: 49% cleaner
Grid trend 2018-2023: -10.9% (cleaner)

kWh to CO₂ Calculator - Hawaii

Enter electricity consumption (kWh):

Using Hawaii average: 1316.1 lb CO₂e/MWh = 0.5970 kg/kWh. Source: EPA eGRID2023.

How to Use Hawaii's Emission Factor for Scope 2 Reporting

For GHG Protocol Scope 2 location-based emissions reporting, multiply each facility's electricity consumption by the emission factor for its ZIP code's eGRID subregion. Facilities in different parts of Hawaii may be in different subregions - use the API to get the exact factor by ZIP code.

curl "https://emission-factors.com/api/lookup?zip=YOUR_ZIP"

Compare with Other States

Hawaii

1316 lb/MWh

Frequently Asked Questions

What is Hawaii's electricity emission factor?

Hawaii's EPA eGRID2023 electricity emission factor is 1316.1 lb CO₂e per MWh (0.5970 kg per kWh). This is 71% dirtier than the US national average.

How do I calculate Scope 2 emissions for a Hawaii facility?

Multiply the facility's annual kWh consumption by 0.5970 to get kg CO₂e. Divide by 1,000 for metric tonnes. For facilities spanning multiple Hawaii subregions, use the emission factors API to get the exact factor by ZIP code.

How clean is Hawaii's electricity grid?

Hawaii's grid is 24% carbon-free and 24% renewable. At 1316 lb CO₂e/MWh, it is 71% dirtier than the US average of 770.9 lb/MWh.

Get exact emission factors by ZIP code

33,616 ZIP codes · All 27 eGRID subregions · CO₂e, NOx, SO₂, generation mix

Read the API docs · Scope 2 calculation guide