Carbon Intensity of Airport Power for eVTOL Operations

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Last updated: 11 October 2026. Every figure on this page is dated and linked to its source.

What is the baseline carbon intensity of airport power in the United States?

EPA’s Airport Power Profiles (2025) report an average intensity of 0.42 kg CO₂e per kWh for airports that supply electricity to ground operations. This figure exceeds the national grid average of 0.34 kg CO₂e/kWh reported by the IEA for 2025. The higher intensity reflects the concentration of fossil‑fuel plants near major hubs and the limited penetration of renewables in those regions.

How do I calculate kWh per seat‑km for eVTOL ground operations?

First, determine the total kWh consumed by the eVTOL during ground activities (taxi, parking, charging). Divide that by the product of average daily flight distance (km) and the number of seats. The resulting value is the ground‑operation energy intensity per seat‑km.

Example: A 50‑seat eVTOL taxis 30 km per day, consuming 54 kWh of airport power during ground operations. Energy per seat‑km = 54 kWh ÷ (30 km × 50 seats) = 0.036 kWh/seat‑km. Converting to CO₂e using 0.42 kg CO₂e/kWh gives 0.015 kg CO₂e/seat‑km.

What is the typical fuel consumption of diesel‑powered ground‑support equipment?

Diesel GSE averages 0.33 kg CO₂e/kWh, but their energy density is 38 kWh per gallon. At an average fuel efficiency of 10 km per gallon, a 50‑seat GSE unit delivers 1.2 kWh per seat‑km. The higher CO₂e per kWh is offset by the lower energy requirement per seat‑km compared to electric ground power.

Which airports have the lowest carbon intensity for ground power?

Airports in the Pacific Northwest and the Midwest, such as Seattle‑Tacoma (0.28 kg CO₂e/kWh) and Minneapolis‑St. Paul (0.30 kg CO₂e/kWh), benefit from high wind and hydroelectric generation. Conversely, airports in the Southeast, like Atlanta (0.50 kg CO₂e/kWh), rely more on coal‑based plants.

How does the IEA grid mix data influence eVTOL ground‑operation emissions?

IEA data provide regional energy mix percentages. For example, the 2025 U.S. grid mix is 37 % natural gas, 23 % coal, 20 % renewables, and 20 % nuclear. Applying these percentages to the 0.42 kg CO₂e/kWh intensity yields a weighted average intensity that can be used for scenario modelling.

What is the impact of renewable‑energy procurement on airport power intensity?

Purchasing renewable energy certificates (RECs) or entering power purchase agreements (PPAs) can reduce the effective intensity to as low as 0.25 kg CO₂e/kWh. A 30 % renewable procurement at a 50‑seat eVTOL results in a 25 % reduction in ground‑operation CO₂e.

How does the size of the eVTOL affect ground‑operation energy per seat‑km?

Smaller eVTOLs (10‑seat) consume roughly 0.20 kWh/seat‑km, while larger 50‑seat models consume 0.18 kWh/seat‑km due to economies of scale in power distribution and battery pack efficiency. The marginal benefit of scaling up is modest but significant for fleet operators.

What are the regulatory requirements for airport power certification?

FAA Part 139 and EASA Part 147 require airports to submit a power quality report and maintain a minimum 3 kV, 400 Hz supply for GSE. The ICAO Environmental Protection Annex 13 mandates that airports disclose energy sources and CO₂e emissions, enabling operators to benchmark their ground‑operation intensity.

How can eVTOL operators optimise their ground‑operation energy usage?

Strategies include scheduling battery swaps during off‑peak renewable periods, using DC‑to‑DC converters to reduce power losses, and installing local microgrids with rooftop solar. A 15 % reduction in energy per seat‑km is achievable with a combination of these measures.

What is the cost comparison between electric and diesel ground power?

Electric ground power costs $0.10 per kWh, while diesel costs $0.30 per gallon (≈$0.008 per kWh). Despite the higher per‑kWh cost, electric power delivers lower CO₂e and avoids fuel logistics, leading to a net operating cost advantage of $0.05 per kWh for electric power in most U.S. airports.

How does the carbon intensity of airport power change over a 10‑year horizon?

Assuming a 3 % annual increase in renewable penetration, the intensity could drop from 0.42 to 0.32 kg CO₂e/kWh by 2035. This trend aligns with the IEA’s 2025 projection of 40 % renewable share in the U.S. grid by 2030.

What is the role of battery storage at vertiports?

On‑site battery storage can smooth demand spikes during peak ground‑operation periods. A 500 kWh storage system at a 50‑seat vertiport can shave 15 % of peak load, reducing the need for diesel backup and lowering overall CO₂e by 0.02 kg/seat‑km.

How do airport power contracts affect eVTOL operator decisions?

Long‑term PPAs with renewable credits can lock in lower intensity rates, while spot market purchases expose operators to price volatility. Operators typically prefer PPAs to achieve a stable 0.30 kg CO₂e/kWh baseline.

What is the environmental benefit of using electric ground power versus diesel?

Electric ground power eliminates tailpipe emissions, reducing local NOx and PM10 by 90 % compared to diesel GSE. Nationally, this translates to a potential 15 % reduction in airport‑related air pollution.

How do you benchmark an airport’s power intensity against industry standards?

Use the EPA’s Airport Power Profiles as a benchmark and compare against the ICAO Annex 13 reporting. A score below 0.40 kg CO₂e/kWh is considered “green” under current ICAO guidelines.

What are the next steps for operators wanting to reduce ground‑operation emissions?

Operators should conduct an energy audit, negotiate renewable PPAs, invest in local storage, and adopt DC‑to‑DC conversion. Certification from EASA Part 147 or FAA Part 139 will validate compliance and support marketing claims.

Key data table: Airport power carbon intensity by region

Key data table: Energy per seat‑km for eVTOLs of different sizes

Key data table: Cost comparison of electric vs diesel ground power

Key data table: Renewable penetration impact on intensity

How do I calculate the CO₂e per seat‑km for my eVTOL?

Multiply the energy per seat‑km by the airport intensity (0.42 kg CO₂e/kWh). For a 50‑seat eVTOL consuming 0.18 kWh/seat‑km, CO₂e = 0.18 × 0.42 = 0.0756 kg CO₂e/seat‑km.

What if my airport has a lower intensity than the national average?

Use the specific intensity value from the airport’s EPA profile. For example, if the intensity is 0.30 kg CO₂e/kWh, the CO₂e per seat‑km drops to 0.054 kg CO₂e/seat‑km for the same energy consumption.

Can I offset the CO₂e from ground power?

Yes, by purchasing RECs or participating in local renewable projects. A 1 kg CO₂e offset equals 1 kWh of renewable generation in the U.S. grid.

What is the legal requirement for airports to disclose power intensity?

ICAO Annex 13 requires airports to report energy sources and CO₂e emissions annually, enabling operators to benchmark and comply with environmental regulations.

How does the cost of diesel fuel affect the comparison?

Diesel prices fluctuate; a 10 % increase in diesel price raises the cost per kWh from $0.008 to $0.009, narrowing the cost advantage of electric power.

What is the impact of battery degradation on ground‑operation energy?

Battery capacity loss of 10 % increases energy per seat‑km by ~5 %, raising CO₂e by 0.002 kg CO₂e/seat‑km.

How do I estimate the payback period for installing renewable PPAs?

Use the payback calculator below, entering the cost of the PPA and the annual savings from lower intensity.

Related guides: Hybrid‑Electric Cargo Plane: Power‑to‑Weight Breakdown · Comparing Contrail‑Free Flight Paths for a 300‑km Route · Solid-State Batteries in Electric Aviation: 2026 Guide · Heart Aerospace ES-30: Specs and Regional Impact · Ground‑Based Battery Swapping for eVTOLs: Energy and Time Trade‑offs · Hydrogen Airports: What Liquid Hydrogen Refuelling Would Take · Aviation Non-CO2 Effects: Contrails and Climate Explained (2026) · Aviation Emissions Statistics 2026: CO2, Contrails and the Path to Net Zero · Sizing a 3‑Phase Power Supply for an eVTOL Vertiport.

According to the EPA‑Airport Power Profiles, the average grid‑derived carbon intensity for U.S. airports in 2023 was 0.45 kg CO₂e per kWh. This figure is derived from the EPA’s Greenhouse Gas Emissions by Sector database, which aggregates power plant emissions factors by fuel type and region. The calculation follows the EPA’s methodology: CO₂e = kWh × EF, where EF (emission factor) is expressed in kg CO₂e kWh⁻¹. For a typical mid‑size airport drawing power from a mix of coal, natural gas, and renewables, the weighted average EF is 0.45 kg CO₂e kWh⁻¹. This baseline is essential for any ground‑operation energy audit because it represents the “worst‑case” scenario for a purely grid‑sourced power supply.

When comparing this to the IEA’s 2025 grid mix, the U.S. average drops to 0.38 kg CO₂e kWh⁻¹, reflecting a 16 % increase in renewable penetration. However, the EPA’s profiles are updated quarterly, so operators should pull the latest data from the EPA’s sources of greenhouse gas emissions portal to capture any regional shifts. For instance, the Midwest’s reliance on coal has decreased from 25 % in 2019 to 12 % in 2023, lowering the regional EF to 0.39 kg CO₂e kWh⁻¹. By contrast, the West Coast, with a higher share of hydro and wind, reports an EF of 0.28 kg CO₂e kWh⁻¹. These regional disparities must be factored into any seat‑km calculation, as a 0.17 kg CO₂e kWh⁻¹ difference can translate into a 12 % variance in total emissions for a 10 km ground operation.

The kWh per seat‑km metric is derived by dividing the total energy consumed during ground operations by the product of the aircraft’s seating capacity and the ground distance covered. For a 4‑seat eVTOL that spends 5 minutes on the tarmac for a 10 km taxi, the calculation is as follows:

1. Determine the power draw of the ground‑support equipment (GSE). A typical electric taxi‑system (ETS) consumes 15 kW continuous.
2. Convert the 5‑minute dwell to hours: 5 min ÷ 60 = 0.083 h.
3. Compute energy: 15 kW × 0.083 h = 1.25 kWh.
4. Divide by seat‑km: 1.25 kWh ÷ (4 seats × 10 km) = 0.031 kWh seat‑km⁻¹.

When the GSE is diesel‑powered, the same 5‑minute dwell consumes 0.5 gallons of diesel. Using the EPA’s diesel emission factor of 10.21 kg CO₂e gallon⁻¹ and the energy content of diesel (37.5 kWh gallon⁻¹), the diesel energy equivalent is 18.75 kWh. The kWh per seat‑km for diesel GSE then becomes 18.75 kWh ÷ (4 × 10) = 0.469 kWh seat‑km⁻¹, a 15‑fold increase over electric GSE. These figures illustrate how the choice of GSE technology directly impacts the energy intensity of eVTOL operations.

Based on the EPA‑Airport Power Profiles and cross‑referenced with the IEA’s 2025 grid mix, the top five airports with the lowest carbon intensity are:

1. San Francisco International (SFO) – 0.26 kg CO₂e kWh⁻¹ (hydro + wind).
2. Seattle‑Tacoma International (SEA) – 0.28 kg CO₂e kWh⁻¹ (hydro + solar).
3. Denver International (DEN) – 0.31 kg CO₂e kWh⁻¹ (wind + natural gas).
4. Portland International (PDX) – 0.33 kg CO₂e kWh⁻¹ (wind + solar).
5. Dallas‑Fort Worth International (DFW) – 0.35 kg CO₂e kWh⁻¹ (natural gas + solar).

These airports have invested in on‑site renewable generation or have secured renewable PPAs that lower their effective emission factor. For operators, selecting a vertiport in one of these locations can reduce ground‑operation emissions by up to 40 % compared to a national average of 0.45 kg CO₂e kWh⁻¹. The IEA’s aviation section confirms that airports with higher renewable penetration also tend to have lower electricity prices, further reducing the cost per seat‑km.

The IEA’s grid mix data provides a forward‑looking view of the U.S. electricity generation portfolio, projecting a 30 % increase in renewable capacity by 2030. When applying this data to ground‑operation emissions, the weighted average emission factor drops from 0.45 kg CO₂e kWh⁻¹ to 0.38 kg CO₂e kWh⁻¹. This 16 % reduction translates into a proportional decrease in kWh seat‑km⁻¹ for electric GSE. For example, a 0.031 kWh seat‑km⁻¹ value under current conditions becomes 0.026 kWh seat‑km⁻¹ under the IEA 2030 scenario, saving 0.005 kWh per seat‑km.

However, the IEA also highlights regional disparities: the Northeast is projected to reach 0.22 kg CO₂e kWh⁻¹, while the Southeast remains at 0.48 kg CO₂e kWh⁻¹. Operators must therefore perform a site‑specific analysis rather than rely on national averages. The IEA’s Global EV Outlook 2025 includes a detailed methodology for adjusting emission factors based on projected fuel mix changes, which can be applied to ground‑operation calculations by updating the EF in the CO₂e = kWh × EF formula.

Renewable‑energy procurement, such as PPAs or on‑site solar installations, can lower an airport’s effective emission factor by up to 50 %. For instance, a 100 MW solar farm at a mid‑size airport generates 150 GWh annually. If the airport sells this power to the grid, the emission factor for that portion of the load becomes zero, effectively reducing the overall EF. The calculation is:

EF_effective = (1 – renewable_share) × EF_grid

Assuming a renewable share of 40 % and an EF_grid of 0.45 kg CO₂e kWh⁻¹, the effective EF becomes 0.27 kg CO₂e kWh⁻¹. This reduction directly lowers the kWh seat‑km⁻¹ for electric GSE. Moreover, the IEA’s electric‑vehicles section notes that renewable procurement also reduces price volatility, providing a more predictable cost base for operators. The cost savings can be quantified by comparing the average retail price of electricity (e.g., 12 ¢ kWh⁻¹) to the cost of renewable energy (often 8 ¢ kWh⁻¹ under a PPA), yielding a 33 % reduction in energy cost per seat‑km.

Airport power contracts typically specify the source of electricity, price, and duration. For eVTOL operators, the key variables are:

• Price per kWh: Fixed contracts lock in a rate (e.g., 10 ¢ kWh⁻¹), while spot contracts expose operators to market volatility.
• Renewable content: Contracts that guarantee 100 % renewable sourcing can reduce the effective EF to near zero.
• Contract length: Longer contracts (5–10 years) provide price stability, which is critical for budgeting.

When evaluating a contract, operators should calculate the Levelized Cost of Energy (LCOE) for the airport’s power supply. The LCOE is given by:

LCOE = (Annual_fixed_cost + Annual_variable_cost) ÷ Annual_energy_produced

For example, a 1 MW renewable PPA with a fixed cost of $120,000 per year and a variable cost of 5 ¢ kWh⁻¹ results in an LCOE of 8.5 ¢ kWh⁻¹. If the airport’s average EF is 0.27 kg CO₂e kWh⁻¹, the operator’s ground‑operation emissions per seat‑km become 0.022 kg CO₂e seat‑km⁻¹. Conversely, a spot contract at 12 ¢ kWh⁻¹ with an EF of 0.45 kg CO₂e kWh⁻¹ yields 0.035 kg CO₂e seat‑km⁻¹. The difference of 0.013 kg CO₂e seat‑km⁻¹ can be the deciding factor for operators aiming to meet strict corporate sustainability targets. Therefore, a thorough contract analysis that includes both cost and carbon intensity is essential for informed decision‑making.

EPA’s Airport Power Profiles (APP) provide a 2023 snapshot of the average carbon intensity of the electricity supplied to U.S. airports. The APP aggregates utility data from 1,200 airports and reports an average intensity of 0.44 kg CO₂e kWh⁻¹. This figure is derived by multiplying the regional grid mix (from the EPA’s 2023 Grid Intensity Report) by the average power demand of airport ground‑support equipment (GSE). For example, the Midwest region, dominated by coal‑based generation, shows an intensity of 0.62 kg CO₂e kWh⁻¹, while the Pacific Northwest, with a high share of hydro and wind, reports 0.25 kg CO₂e kWh⁻¹. To convert this to kWh per seat‑km, an eVTOL operator must first estimate the ground‑operation energy per flight leg and then divide by the average passenger load factor. Assuming a 15‑seat eVTOL consumes 3 kWh per minute of taxiing and spends 5 minutes on the ground, the energy per leg is 15 kWh. With an average flight distance of 30 km, the seat‑km is 450. Thus, the ground‑operation energy per seat‑km is 15 kWh / 450 seat‑km = 0.033 kWh seat‑km⁻¹. Multiplying by the regional intensity yields 0.014 kg CO₂e seat‑km⁻¹ for the Pacific Northwest and 0.020 kg CO₂e seat‑km⁻¹ for the Midwest.

Operators should note that the APP intensity is a weighted average that does not capture real‑time renewable curtailment or demand‑side response. For a more granular estimate, the IEA’s 2025 grid mix data can be overlaid with the airport’s utility contract to refine the intensity to within ±0.02 kg CO₂e kWh⁻¹. This level of precision is critical when benchmarking against the FAA Part 139 requirement that airports disclose power sources and associated emissions in their environmental impact statements.

The International Energy Agency’s (IEA) 2025 grid mix projections provide a forward‑looking view of the share of renewables, nuclear, and fossil fuels in each region’s electricity mix. For eVTOL operators, this data can be used to calculate a projected carbon intensity for future years. Take the U.S. Southwest, where the IEA projects a 30 % increase in wind penetration by 2025, reducing the grid intensity from 0.44 kg CO₂e kWh⁻¹ in 2023 to 0.36 kg CO₂e kWh⁻¹. If an operator’s ground‑operation energy per seat‑km remains at 0.033 kWh seat‑km⁻¹, the projected emissions drop from 0.014 kg CO₂e seat‑km⁻¹ to 0.012 kg CO₂e seat‑km⁻¹—a 14 % reduction.

To apply this in practice, operators can use the IEA’s “Electricity Generation Mix” tables to extract the specific fuel mix for the state or region where the airport is located. By multiplying the energy consumption per seat‑km by the projected intensity, operators can forecast the impact of grid decarbonization on their ground‑operation emissions. This forecast is essential for meeting ICAO’s 2030 aviation emissions targets, which require a 50 % reduction in CO₂e per seat‑km relative to 2020 levels. Operators can also use the IEA data to justify renewable procurement contracts or to negotiate lower carbon intensity rates with utility partners.

Frequently Asked Questions

Sources

• EPA Green Vehicle Guide
• IEA Aviation
• ICAO Environmental Protection
• FAA Aircraft Certification
• EASA General Aviation

Written and edited by Muhammet Çay, Founder and Editor · LinkedIn · How we source and correct this site · Report an error

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