An airframe manufacturer fits an auxiliary power unit before an aircraft ever reaches a customer. An airline or lessor replaces or overhauls one years into service. A defense agency buys and sustains units across a fleet that may fly for decades. All three are buying the same class of equipment: a small onboard turbine or electric power system that keeps electrical power, compressed air and engine-starting capability available while the main engines are shut down, mostly on the ground and occasionally in flight as a backup source. The market also covers the electric ground power and battery-based units that airports and MRO facilities run in place of an aircraft's own unit.
Contrive Datum Insights sizes the global aircraft auxiliary power unit market at USD 4.15 billion in 2025, rising to USD 4.48 billion in 2026 and USD 7.9 billion by 2034, a compound annual growth rate of 7.35% across the forecast period. The finding comes from a new report, "Aircraft Auxiliary Power Unit Market Size, Share & Industry Analysis, By Type (Electric Ground Power, Battery Power, Other), Platform (Commercial, Military), Application (Civil Aircraft, Military Aircraft, Other), End use (OEM, Aftermarket), Power rating (Below 200 kW, 200-400 kW, Above 400 kW), and Regional Forecast, 2026-2034."
Spending Concentrates on Ground Power Today, Shifts Toward Batteries Later
Electric Ground Power accounts for 61.9% of 2025 revenue, USD 2.57 billion, and stays the largest type line through 2034 at 54.1% of a larger total. Battery Power is smaller today, USD 1 billion and 24.1% of revenue, but compounds at 11.58% a year against the market's overall 7.35%, reaching USD 2.69 billion and 34.1% of revenue by 2034. By platform, Commercial aircraft account for 77.1% of 2025 revenue, USD 3.2 billion; by application, civil aircraft account for 68%, USD 2.82 billion. OEM buyers take 54.9% of 2025 revenue, USD 2.28 billion, even as aftermarket demand grows faster, at 8.16% a year. Among power ratings, the 200-400 kW class leads with 45.1% of 2025 revenue, USD 1.87 billion, while units above 400 kW grow fastest, at 9.58%.
Regionally, North America is the largest market, holding 34.9% of 2025 revenue, USD 1.45 billion, and growing to USD 2.53 billion by 2034. The United States alone accounts for USD 1.23 billion in 2025, 29.6% of global revenue. Asia Pacific's share climbs from 24.1% to 28% of revenue over the forecast period, with value rising from USD 1 billion to USD 2.21 billion. The Middle East and Africa stays the smallest region throughout, at 7% of revenue in both 2025 and 2034.
The base-case forecast of USD 7.9 billion by 2034 sits between two other paths the study also models. If airframe delivery backlogs convert on schedule and more-electric aircraft designs spread faster than expected, 2034 revenue could reach USD 8.89 billion. If deliveries slip and airlines hold onto older fleets longer, replacement and retrofit spending could instead land at USD 6.91 billion. Under any of the three, Battery Power keeps growing faster than the market it sits inside, and Electric Ground Power keeps supplying most of the dollars; the two dynamics do not cancel each other out over the next nine years.
The report tracks revenue and growth for every line across five segmentation axes, by type, platform, application, end use and power rating, for each year from 2020 through 2034, with country-level detail across all five regions, competitive landscape coverage and the methodology behind each estimate. It is delivered as a PDF; a free sample is available on request.