Sam Bowers

Calculator · v1.0 · 17 Jun 2026

The Electricity Burden of Military e‑SAF

Replacing military jet fuel with synthetic fuels is not simply a fuel challenge. It is a power-system buildout challenge — and a production capacity one.

Europe's armed forces run on jet fuel. Aviation accounts for roughly 85 percent of military liquid fuel demand — a figure that holds across NATO allies in conflict scenarios, and that reflects the basic physics of high-performance aircraft. The F-35 requires 60 percent more fuel per sortie than the F-16 it replaces. Eurofighters, Typhoons, and Rafales share the same constraint: high-energy liquid hydrocarbons, stored in volume, available at dispersed forward locations.

This dependency is both a strategic vulnerability and a long-term logistics problem. A disruption to Europe's jet fuel supply — through refinery constraints, pipeline failure, or geopolitical pressure on the Central Europe Pipeline System — directly impairs operational readiness. As military demand on European fuel infrastructure grows, so does the case for synthetic alternatives produced domestically from electricity.

Synthetic aviation fuel — e-kerosene, produced from renewable electricity, electrolytic hydrogen, and captured carbon dioxide — is technically viable and drop-in compatible with existing engines. Unlike biomass-constrained biofuel pathways, PtL fuels offer a theoretically scalable synthetic production route tied primarily to electricity availability — and one controlled by governments that also control electricity networks. The core chemistry is established, but the challenge is scaling production systems, securing electricity supply, and integrating industrial processes at commercial scale. Each tonne of e-kerosene requires 22 to 35 megawatt-hours of electricity depending on the CO₂ source. Commercial e-SAF production remains extremely limited globally as of 2025 — ERA ONE (INERATEC, Frankfurt), which entered commercial operation that year at roughly 2,500 tonnes per year, represents the current frontier of the industry. No large-scale commercial e-SAF industry yet exists. Europe's entire realistic production pipeline for 2030 is 360,000 to 1.7 million tonnes per year. The calculator below shows what military demand would require.

Scale calculator

Select a replacement percentage and CO₂ source assumption. Outputs update to show implied annual electricity demand, infrastructure requirements, and production capacity gap.

Military fuel replaced by e-SAF
CO₂ source assumption
Operational tempo
ELECTRICITY 35 MWh/t ELECTROLYSIS 50 kWh/kg H₂ HYDROGEN 0.30 t/t e-SAF CO₂ SOURCE Direct air capture 3.1 t CO₂/t e-SAF FT SYNTHESIS Fischer-Tropsch e-SAF e-kerosene DAC capture energy: ~17 MWh/t of total

Pathway: renewable electricity → electrolysis → H₂ + CO₂ → Fischer-Tropsch synthesis → synthetic kerosene. Annotations update with CO₂ source selection above.

Fuel baseline: 4 Mt/year (EU military aviation, estimated central — see methodology). Wartime tempo multiplies demand. Effective: 4 Mt/year.

e-SAF required 2.00 Mt per year
Electricity demand 70.0 TWh per year
Hydrogen required 600 kt H₂ per year
CO₂ feedstock required 6.20 Mt CO₂ per year
Electrolyser capacity 3.8 GW dedicated capacity
Offshore wind equivalent 19.9 GW capacity
Carbon intensity (indicative, 100% renewable electricity) ~12 gCO₂e/MJ · 86% reduction vs fossil jet (89 gCO₂e/MJ) · meets ReFuelEU 70% threshold — range 8–20 gCO₂e/MJ depending on process assumptions
Strategic reserve requirement
Reserve needed 164 kt e-SAF
Days of T&E 2030 production to build stockpile 35 days (1,700 kt/yr pipeline)
Days of IEA 2030 production to build stockpile 166 days (360 kt/yr pipeline)

ERA ONE (INERATEC, Frankfurt, 2025): ~2,500 t/yr — roughly 0.06% of the 4 Mt/yr military baseline. Even the optimistic T&E 2030 pipeline (1,700 kt/yr) would be fully consumed by demand at higher replacement scenarios, leaving no surplus for stockpiling.

Electricity demand by replacement scenario

Annual TWh required to produce military e-SAF at each replacement level. Updates when you change the CO₂ source assumption above. Click a row to select that scenario.

0 50 100 150 TWh per year ReFuelEU 2030 synth. EU offshore wind fleet 5% 7 TWh 10% 14 TWh 25% 35 TWh 50% 70 TWh 100% 140 TWh

Reference lines: ReFuelEU 2030 synthetic sub-mandate (~11 TWh); EU offshore wind fleet output at 40% capacity factor (~74 TWh, from 21.2 GW installed). Baseline: EU military aviation fuel ~4 Mt/year.

Competing electricity claims on EU clean power

Annual electricity demand from sectors competing for the same renewable generation. The vertical line marks approximately one year of EU clean power additions — the pace at which Europe is currently expanding its grid. Military e-SAF bars reflect the active CO₂ source selection above.

0 50 100 150 200 TWh per year ← 1 yr EU clean additions (~100 TWh) EU data centres (2030) 115–168 TWh (IEA / Ember) 150 TWh EU green steel (2030 projects) ~135 TWh (Stockholm Environment Inst.) 135 TWh EU data centres (2024) ~96 TWh (EU Commission) 96 TWh ReFuelEU synthetic (2030) 0.7% of EU aviation fuel, civilian only 11 TWh Military e-SAF 100% 35 MWh/t — Direct air capture 140 TWh Military e-SAF 50% 35 MWh/t — Direct air capture 70 TWh

Sources: EU data centres — EU Commission / Ember (2025); green steel — Stockholm Environment Institute; annual EU clean additions — derived from 73–85 GW new capacity, 2023–24 (Ember). Military e-SAF figures assume 4 Mt baseline. These comparisons are directional and represent annual electricity demand equivalents rather than identical load profiles or grid integration characteristics.

"At 50% replacement with direct air capture, EU military e-SAF alone would require electricity roughly equivalent to the entire output of Europe's current offshore wind fleet — built over decades, now serving 26 countries."

"Military synthetic fuels compete for clean electricity with electrification, industry, hydrogen production, data centres, and civilian aviation mandates — all simultaneously expanding their claims on renewable generation that adds only ~100 TWh per year."

"The production constraint may currently be more binding than electricity availability alone. Europe has begun moving beyond pilot-scale PtL facilities, with projects such as INERATEC's ERA ONE plant in Frankfurt entering commercial operation in 2025 at roughly 2,500 tonnes per year of e-fuel capacity. But this remains negligible relative to projected aviation demand — ERA ONE equals roughly 0.06% of the military fuel baseline. Europe's earliest industrial e-kerosene projects also illustrate the difficulty of scaling production reliably: Atmosfair's Werlte PtL facility reportedly produced only around five tonnes of certified synthetic kerosene and, according to the company itself, still does not operate as planned after four years."

Military e‑SAF: a constrained‑systems view

Military e-SAF is more plausibly understood as a niche strategic capability than a broad fuel replacement pathway. The core chemistry is technically proven, and several small-scale facilities now operate commercially — but industrial scale-up remains immature, and the production capacity that exists is measured in thousands of tonnes, not the millions that broad military replacement would require. The binding constraints are structural: the pace at which European clean power is actually growing, the scarcity of committed industrial investment, and the sequencing problem that arises when military e-SAF competes for the same electricity additions as green steel, data infrastructure, and civilian aviation mandates.

As a niche resilience tool, e-SAF is viable. Replacing 5–10% of military aviation fuel would require 200–400 kt of production per year and 5–14 TWh of electricity. Both are within reach of a determined buildout: the electricity demand is modest relative to the EU's clean power expansion, and the production volume sits within the lower end of announced European pipelines. For strategic reserve stockpiling, forward operating base fuel security, or high-value mission-critical aircraft, synthetic fuel offers something conventional supply chains cannot — domestically controlled production, reducing dependence on fossil fuel supply chains and Russian pipeline leverage. Norway's commitment to 15% biofuel blending for military operations points toward the realistic near-term model.

Beyond niche coverage, the constraints accumulate rapidly. The 25–50% replacement scenarios require 1–2 million tonnes of e-SAF per year — comparable to or exceeding Europe's entire projected 2030 production pipeline, leaving nothing for civilian aviation's mandatory ReFuelEU obligations. The electricity demand reaches 35–70 TWh (DAC assumption), competing directly with EU data centre growth, green steel electrification, and EV charging — all priority claims on the same renewable buildout. And all of this assumes a production infrastructure that barely exists at scale: while ERA ONE (INERATEC, Frankfurt) entered commercial operation in 2025 at roughly 2,500 tonnes per year, Europe's total operational PtL capacity remains measured in thousands of tonnes — not the millions that broad military replacement would require.

The most defensible framing is that military e-SAF is likely to remain a niche strategic capability under severe scaling constraints — not a broad fuel replacement pathway, and not primarily a question of technical feasibility. The realistic role is strategic reserve and partial mission coverage for the highest-priority capabilities, powered by dedicated renewable installations rather than grid draw, built incrementally over the 2027–2035 window as the first commercial-scale facilities mature. The core problem is allocation and sequencing under constrained clean power growth: at current buildout rates, Europe adds on the order of 100 TWh per year of new clean generation. Military e-SAF can take a niche slice of that. It cannot take most of it and still serve the competing electrification priorities the transition simultaneously demands.

Methodology and assumptions

Electricity and process parameters

ParameterValueBasis
EU military aviation jet fuel ~4 Mt/year Estimated central figure. Not publicly disaggregated by member states. Derived from EU27 total aviation fuel (~46 Mt, Eurostat) and an assumed peacetime military share of 3–8%. Does not include UK armed forces, naval aviation, or classified war reserve draw. Significant uncertainty — see Key uncertainties below.
Intensity — point-source CO₂ 22 MWh/t Near-term with industrial flue gas CO₂. Consistent with ICCT (2022) and T&E ranges. Splits roughly: electrolysis ~15 MWh/t, FT synthesis ~4–5 MWh/t, CO₂ capture ~2–3 MWh/t.
Intensity — direct air capture 35 MWh/t CATF "Decarbonizing Aviation" (2024): 32 kWh/L at 2025 tech. Converted at 0.804 kg/L → ~40 MWh/t; 35 used as conservative near-term figure. DAC adds ~13–17 MWh/t vs. point-source due to atmospheric CO₂ concentration penalty. Only pathway closing the carbon cycle fully.
Intensity — cement CCU 19 MWh/t (derived estimate) Applies where CO₂ capture is already underway at a cement plant (e.g. CCS stream being diverted to CCU). Marginal electricity is recompression only (~0.1–0.3 MWh/t CO₂ × 3.1 t CO₂/t e-SAF ≈ 0.3–1 MWh/t), saving ~3 MWh/t vs. dedicated point-source capture. Derived from cement CCS capture energy literature (IEAGHG 2018-TR03); no single published figure covers this marginal CCU case directly. Carbon accounting note: CO₂ is released at combustion and not permanently sequestered — comparable lifecycle CI to point-source, not DAC.
H₂ per tonne e-SAF 0.30 t/t Fischer-Tropsch chemistry; literature range 0.28–0.33 t H₂/t fuel.
CO₂ per tonne e-SAF 3.1 t/t Carbon stoichiometry: jet fuel ~85% C by mass at 44/12 molecular ratio.
Electrolyser specific energy 50 kWh/kg H₂ Current PEM/alkaline benchmark (IRENA, CATF). Capacity calculated at 90% load factor for dedicated industrial facility. Global installed electrolyser capacity remains below 1 GW as of 2025.
Offshore wind capacity factor 40% North Sea typical (WindEurope / IRENA). Southern siting implies more capacity for equivalent generation.
EU electricity generation 2,732 TWh Ember: European Electricity Review 2025 (2024 data).
EU cumulative offshore wind (2024) 21.2 GW → ~74 TWh/yr WindEurope / EU Blue Economy Observatory, 2024.

Carbon intensity by CO₂ source

CO₂ sourceIndicative CI (gCO₂e/MJ)vs fossil jetNotes
Direct air capture~8–20 (central: ~12)86–91% reductionCloses the carbon cycle; CI driven almost entirely by electricity grid carbon intensity. Meets ReFuelEU 70% threshold.
Point-source CO₂~30–55 (central: ~40)38–66% reductionCO₂ emitted at combustion was already destined for atmosphere; lifecycle CI depends on capture efficiency and upstream emissions. May not meet ReFuelEU 70% threshold.
Cement CCU~20–40 (central: ~30)55–78% reductionProcess CO₂ from calcination is unavoidable regardless of fuel switch — using it for e-SAF is preferable to atmospheric release. If diverted from a CCS stream, CO₂ is not permanently stored. Marginally better framing than generic point-source; CI driven by electricity.

CI figures are indicative, assuming 100% renewable electricity. Full lifecycle range across PtL SAF scenarios: 11–101 gCO₂e/MJ (source: lifecycle assessment literature, ScienceDirect 2025). Fossil jet baseline: 89 gCO₂e/MJ (CORSIA/ReFuelEU). ReFuelEU 70% threshold: ~27 gCO₂e/MJ.

Production capacity benchmarks

BenchmarkValueBasis
Current operational e-SAF (2025) Extremely limited T&E tracker (2024); T&E report (May 2025); INERATEC / Aviation Week (2025). Commercial e-SAF production is negligible at aviation scale. Germany's Atmosfair PtL plant in Werlte, one of the earliest e-kerosene demonstration facilities, reportedly produced ~5 tonnes TÜV-certified fuel; the company stated in 2025 it "still doesn't function nearly as planned after four years." INERATEC's ERA ONE facility entered commercial operation in 2025 with planned output ~2,500 t/yr — the current commercial frontier, but orders of magnitude below aviation demand.
EU pipeline 2030 — optimistic (T&E) 1,700 kt/year T&E e-kerosene tracker: 25 EU projects with ambition to produce 1.7 Mt by 2030. Pipeline has shrunk 25% vs. prior year's estimates. Zero large-scale European projects have reached FID. Each plant requires €1–2bn investment.
Global 2030 — IEA main case ~360 kt/year IEA Renewables 2024: e-kerosene forecast at ~5% of 9 billion litres total SAF in 2030. Converted at 0.804 kg/L and 1,000 L/t. Reflects mandated European sub-targets only.
First commercial e-SAF deliveries expected 2026 T&E / EASA SAF market data; assuming announced project timelines hold.

Scope: what these benchmarks exclude

These benchmarks cover Power-to-Liquid (PtL) e-kerosene only — synthetic fuel produced from renewable electricity, electrolytic hydrogen, and captured CO₂. Two categories of SAF production are deliberately excluded:

Biomass-to-liquid and HEFA pathways. Biofuel-derived SAF uses organic feedstocks — wood waste, agricultural residues, used cooking oil, municipal solid waste — rather than electricity. The constraint profile is entirely different: feedstock availability and land-use competition, not grid capacity. Production from these pathways is already at larger commercial scales in some markets (HEFA is the dominant SAF technology today), but the feedstock is not independently controllable by EU governments in the same way as domestically generated electricity. Announced biomass gasification or methanol-to-SAF facilities — including those outside Europe — fall into this category and are not relevant to the electricity-infrastructure argument this analysis makes.

Non-EU facilities. The analysis concerns European military demand and European production capacity. SAF plants in the United States or elsewhere do not contribute to EU energy security or reduce European dependence on fossil fuel supply chains. A domestically produced PtL fuel is strategically distinct from an imported biofuel blend, regardless of its lifecycle carbon intensity.

This scope is a deliberate framing choice, not an omission. PtL e-kerosene is the only SAF pathway whose scaling constraints are inseparable from the EU's clean power buildout — and therefore the only pathway where the electricity argument bites.

Competition chart sources

ItemValueSource
EU data centres 2024~96 TWhEU Commission energy focus report (Nov 2025)
EU data centres 2030115–168 TWhIEA / Ember grids for data centres report (2025)
EU green steel 2030~135 TWhStockholm Environment Institute — renewable electricity demand for announced green iron and steel projects
Annual EU clean power additions~100 TWh/yrDerived from 73–85 GW new wind + solar capacity annually (Ember 2024–25) at blended capacity factors
ReFuelEU synthetic mandate 2030~11 TWh0.7% of EU aviation fuel (~44 Mt) at 35 MWh/t DAC assumption

Key uncertainties

The military aviation fuel baseline is the largest source of uncertainty — public military aviation fuel data are fragmented and often classified. The 4 Mt central estimate is derived from EU total aviation fuel shares, comparative NATO energy studies, and military aviation activity assessments; it does not include UK armed forces, naval aviation, or classified war reserve draw. The CO₂ source assumption is the largest swing factor in the electricity calculation. Production capacity projections are highly uncertain: few EU e-SAF projects have reached FID, timelines are slipping, and announced pipeline figures have shrunk ~25% year-on-year.

Sources