What data source is used for emissions from natural gas and petroleum systems?

[bl-young]

Both use 3-64 and 3-45 for CH4 (and following tables for CO2).

However, USEEIO draws N2O emissions from the specific tables (3-68 and 3-49). I see the handling of methane, e.g. here in CEDA, but not N2O.

Resolved: Consider revising mappings, but uses the detail tables for all flows.

[bl-young]

Those tables, 3-68 and 3-49 are not in the list of tables used in CEDA

[bl-young]

Also note that the mappings are the same for natural gas systems, but CEDA might be missing Exploration and Post-Meter

USEEIO:

Activity	Sector
Exploration	211120
Production	211130
Distribution	221210
Post-Meter	221210
Processing	211130
Transmission and Storage	486210

CEDA:

EPA_NATURAL_GAS_SYSTEMS_TO_BEA_INDUSTRY_MAPPING: ta.Dict[str, CEDA_V7_SECTOR] = {
    "Production": "211000",  # previously Field Production
    "Processing": "211000",
    "Transmission and Storage": "486000",
    "Distribution": "221200",
}

[WesIngwersen]

Also note that the mappings are the same for natural gas systems, but CEDA might be missing Exploration and Post-Meter

USEEIO:

Activity Sector
Exploration 211120
Production 211130
Distribution 221210
Post-Meter 221210
Processing 211130
Transmission and Storage 486210

Just by name I understand 'Post-meter' to be at the final user behind their own gas meter. If that is correct that would suggest attribution to users.

[sangwonsuhvm]

I agree with Wes on post meter. I think the emissions from exploration should have been attributed to 213112 – Support activities for oil and gas operations. If those tables were not used in CEDA, it is likely to be an oversight.

[MoLi7]

@bl-young just to clarify, USEEIO attributes to NAICS codes whereas CEDA attributes to BEA codes.

It would be helpful to add a mapping like:

NAICS	BEA
211120	210000
211130	210000
221210	221200
486210	486000

[bl-young]

For Petroleum,

USEEIO:

Activity	Sector
Exploration	211120
Production	211130
Crude Oil Transportation	486110
Transportation	486110
Refining	324110
Crude Refining	324110

CEDA CH4 is only allocating to the extractive industries:

EPA_EMISSION_SOURCE_TO_BEA_INDUSTRY_MAPPING: ta.Dict[str, CEDA_V7_SECTOR] = {
    # NOTE: No "Production Voluntary Reductions" found in Table 3-36 or 3-37
    # Production Field Operations (Net) therefore assumed to be same as total
    "Total ": "211000",
}

CO2:

def allocate_petroleum_systems() -> pd.Series[float]:
    ser = load_co2_emissions_from_petroleum_systems()
    allocated = pd.Series(
        {
            "211000": ser["Exploration"] + ser["Production "],
            "324110": ser["Crude Refining"],
        }

[bl-young]

The impact of this is likely to be quite small given the quantity of emissions that are attributed differently:

[bl-young]

Consensus: Use the full dataset for all flows, as is done in flowsa. Though may need to revise a few mappings.