Hawaii Electricity Emission Factor 2023

EPA eGRID2023 Rev2 · 2 eGRID subregions

Power plants in Hawaii emitted 1394.7 lb CO2e per MWh generated in 2023 (0.6326 kg/kWh), 81% dirtier than the US average, according to EPA's eGRID2023 state rate. Their generation was 20% carbon-free and 20% renewable. For GHG Protocol Scope 2 location-based reporting, use the eGRID subregion factor of each facility's ZIP (below), not the state rate: power flows across state lines within a subregion.

1394.7
lb CO2e / MWh (state)
0.6326
kg CO2e / kWh
20%
Carbon-free
20%
Renewable

eGRID Subregions in Hawaii

Hawaii's ZIP codes fall in 2 eGRID subregions. These are the Scope 2 factors; use the ZIP-level API to get the one for each facility.

SubregionNamelb CO2e/MWhkg/kWhCarbon-freeShare of HI ZIPs
HIMS HICC Miscellaneous 1133.294 0.5141 34.19% 61%
HIOA HICC Oahu 1498.947 0.6799 14.24% 39%

Generation Mix

Solar7.1%
Wind6.5%
Hydro1.0%
Biomass3.1%
Geothermal2.1%
Oil78.2%
Other Fossil1.9%

Generation by power plants in Hawaii, 2023 (EPA eGRID2023 state resource mix).

kWh to CO2 Calculator - Hawaii

Using the HIMS subregion factor (1133.294 lb CO2e/MWh = 0.5141 kg/kWh), which covers 61% of Hawaii's ZIP codes; for other parts of the state look up the ZIP. 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 are in different subregions - use the API to get the exact factor by ZIP code.

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

Other States Served by the Same Subregions (state rates)

Hawaii
1395 lb/MWh

Frequently Asked Questions

What is Hawaii's electricity emission factor?

For Scope 2 reporting, it depends on the ZIP: Hawaii's ZIP codes are in HIMS (1133.294 lb CO2e/MWh, 61% of ZIPs), HIOA (1498.947 lb CO2e/MWh, 39% of ZIPs). EPA's state rate for plants in Hawaii is 1394.7 lb CO2e/MWh, 81% dirtier than the US average.

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

Multiply the facility's annual kWh by the kg/kWh factor of its ZIP code's eGRID subregion to get kg CO2e, and divide by 1,000 for metric tonnes. The emission factors API returns the factor for any ZIP.

How clean is Hawaii's electricity grid?

Power plants in Hawaii generated 20% carbon-free and 20% renewable electricity in 2023. At 1395 lb CO2e/MWh, the state rate is 81% dirtier than the US average of 770.9 lb/MWh.

Get exact emission factors by ZIP code

33,700+ ZIP codes · All 27 eGRID subregions · CO2e, NOx, SO2, generation mix

Read the API docs · Scope 2 calculation guide