Neqsim Energy Emissions Screening

Energy & Emissions Screening

Use this skill for a quick, public roll-up of field-life energy use into emissions. Given a year-by-year energy use (MWh), a public emission factor, and an optional production profile, it returns annual and total CO2-equivalent emissions, a carbon intensity in kg CO2e per barrel of oil equivalent, and an optional CO2-tax cost. It complements the instantaneous combustion skill neqsim-co2-emissions-screening by aggregating over the field life and adding carbon intensity and cost.

When to Use

• When a user wants total and per-year CO2e and a carbon intensity for a concept.
• When an agent needs an emissions/cost feed for an asset-value chain.
• When examples must run without certified emission factors or confidential data.

Inputs

• annual_energy_use_mwh: sequence of annual energy use in MWh (one per year).
• emission_factor_kg_co2e_per_mwh: public emission factor (default 450).
• annual_production_boe: a flat value or a per-year sequence in boe (default 0).
• co2_tax_usd_per_tonne: optional CO2 tax (default 0).

Outputs

• annual_co2e_tonnes: per-year CO2-equivalent emissions in tonnes.
• total_co2e_tonnes: total field-life CO2e in tonnes.
• total_energy_use_mwh: total field-life energy use.
• carbon_intensity_kg_per_boe: total CO2e (kg) divided by total production (boe), or None.
• annual_emission_cost_musd / total_emission_cost_musd: CO2-tax cost in million USD.
• intensity_warning: ok, watch, high, or no-production.
• neqsim_available: whether the optional NeqSim package is importable.
• assumptions: public assumptions and required follow-up.

Engineering Method

Annual CO2e is energy_use_MWh * emission_factor_kg/MWh / 1000 (kg to tonnes). Total CO2e and total energy are the year sums. Carbon intensity is total_CO2e_kg / total_production_boe (undefined when production is zero). The CO2-tax cost is annual_CO2e_tonnes * tax_USD/tonne / 1e6 (million USD). The verdict compares carbon intensity to a configurable threshold (default 17 kg CO2e/boe, a public global-average order of magnitude).

This skill uses a single public emission factor and models no combustion efficiency, methane slip, flaring, venting, allowances, or capture credit. It is a placeholder that must be replaced by validated NeqSim combustion modelling and certified emission factors for any quantitative or reporting use.

Python Usage Pattern

from energy_emissions_screening import EnergyEmissionsModel

model = EnergyEmissionsModel()
result = model.evaluate(
    annual_energy_use_mwh=[120000.0, 180000.0, 175000.0, 150000.0, 120000.0],
    emission_factor_kg_co2e_per_mwh=450.0,
    annual_production_boe=[3.0e6, 7.0e6, 6.5e6, 5.0e6, 3.5e6],
    co2_tax_usd_per_tonne=85.0,
)

print(result.total_co2e_tonnes)
print(result.carbon_intensity_kg_per_boe)
print(result.total_emission_cost_musd)
print(result.intensity_warning)

Validated NeqSim Path

This screening is a placeholder. For real emission accounting use:

• NeqSim neqsim.standards.gasquality.Standard_ISO6976 for calorific value.
• NeqSim neqsim.process.equipment.powergeneration.GasTurbine for fuel-gas consumption and turbine duty.
• NeqSim neqsim.process.equipment.reactor.GibbsReactor for equilibrium combustion products, and the neqsim-co2-emissions-screening skill for a per-stream combustion-CO2 rate.

Escalation

Escalate any high verdict, any reporting use, and any carbon-tax exposure to validated NeqSim combustion modelling, certified emission factors, and qualified environmental reporting.

Validation Checklist

• Inputs are validated and within stated ranges.
• Examples use public data only.
• Screening assumptions are stated explicitly.
• Limitations are respected.
• Quantitative use is escalated to validated NeqSim models.

Common Mistakes

Limitations

• Educational screening only; not a validated design method.
• No confidential data or proprietary methods are included.
• Escalate any quantitative or design use to validated NeqSim workflows.

References

• NeqSim repository: https://github.com/equinor/neqsim
• NeqSim Skills Guide: https://github.com/equinor/neqsim/blob/master/docs/integration/skills_guide.md