HIOA eGRID Subregion - HICC Oahu Emission Factor (2023)

EPA eGRID2023 Rev2 · States: HI · Very Dirty

HIOA (HICC Oahu) covers ZIP codes in HI (100%), by share of its ZIP codes. Its largest generation sources in 2023 were oil 83%, solar 7%, wind 4%. This page gives the official EPA eGRID2023 emission factors for HIOA, used for GHG Protocol Scope 2 location-based reporting.

Emission Factors

1498.947

lb CO₂e / MWh

0.6799

kg CO₂e / kWh

14.24%

Carbon-free

14.24%

Renewable

The HIOA subregion is 94% dirtier than the US average (770.9 lb CO₂e/MWh).

All Pollutants

Pollutant	lb / MWh	kg / kWh	Scope
CO₂e (total GHG)	1498.947	0.6799	Scope 2
CO₂	1489.548	0.6756	Scope 2
CH₄ (methane)	0.134	0.00006078	Scope 2
N₂O (nitrous oxide)	0.021	0.00000953	Scope 2
NO_x	3.908	0.00177264	Air quality
SO₂	4.28	0.00194138	Air quality
CO₂ non-baseload	1753.441	0.7953	Avoided-emissions estimates (not Scope 2)

Generation Mix

Solar7.4%

Wind4.3%

Biomass2.5%

Oil83.1%

Other Fossil2.7%

kWh to CO₂ Calculator

Enter electricity consumption (kWh):

Using HIOA emission factor: 1498.947 lb CO₂e/MWh = 0.6799 kg/kWh. Source: EPA eGRID2023.

Data Source & Methodology

These emission factors are from EPA eGRID2023 Rev2 (released June 2025), the official US government source for grid electricity emission rates. eGRID uses annual net generation and emissions data from all US power plants to calculate subregion-level output emission rates.

For GHG Protocol Scope 2 reporting, use the CO₂e total output emission rate: 1498.947 lb/MWh or 0.6799 kg/kWh.

Get This Data via API

Query HIOA emission factors by ZIP code:

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

Read the API docs - free, no key, no signup.

Subregions Serving the Same States

HIMS - HICC Miscellaneous

Frequently Asked Questions

What is the HIOA emission factor for Scope 2 reporting?

The HIOA eGRID2023 Scope 2 location-based emission factor is 1498.947 lb CO₂e per MWh (0.6799 kg CO₂e per kWh). This is the value to use in GHG Protocol location-based Scope 2 calculations for facilities in the HICC Oahu subregion.

Which states are in the HIOA subregion?

HIOA (HICC Oahu) covers ZIP codes in HI (100%), by share of its ZIP codes. Its largest generation sources in 2023 were oil 83%, solar 7%, wind 4%.

How do I convert kWh to kg CO₂e for HIOA?

Multiply kWh by 0.6799. Example: 50,000 kWh × 0.6799 = 33995 kg CO₂e (33.99 tonnes).

Query any US ZIP code via API

33,700+ ZIP codes · All 27 eGRID subregions · EPA eGRID2023 + eGRID2024 (Cornerstone)

Read the API docs · Scope 2 guide