neqsim-energy-emissions-screening

name	neqsim-energy-emissions-screening
calculation_basis	screening
version	0.1.0
description	Educational field-life energy and CO2-equivalent emissions roll-up that turns a year-by-year energy use into annual and total CO2e, a carbon intensity (kg CO2e/boe), and an optional CO2-tax cost. USE WHEN: a task needs a public, screening-level field-life emissions and carbon-intensity picture before detailed NeqSim combustion modelling or certified emission reporting.
last_verified	2026-06-24
requires	{"python_packages":[],"java_packages":[],"env":[],"network":[]}

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

Symptom	Cause	Fix
Unrealistic result	Inputs outside the screening range	Keep inputs within the stated bounds
Misused for design	Screening output taken as final	Escalate to validated NeqSim models

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