Auxiliary Power Units: Market Size & Forecast 2026

The global APU market is estimated at approximately USD 4.0 billion in 2025 and is forecast to grow at a compound annual rate of around 5.2% through the next decade. APUs are critical onboard equipment for commercial, regional, business, and military aircraft, and they also serve certain marine and land-vehicle applications. Market scope varies between analysts depending on whether military and non-aviation segments are included, which accounts for the wide range of published valuations.

• •Approximately USD 4.0 billion in 2025, growing at ~5.2% CAGR.
• •Commercial aviation accounts for the majority of APU unit demand and revenue.
• •Scope differences (military, marine, land) explain the spread of published market figures.

Rising air-traffic volumes and the resulting increase in aircraft deliveries are the primary structural driver of APU demand, as every new airframe requires a fitted APU and a service-support package. Fleet modernisation programs are accelerating the replacement of older pneumatic APUs with quieter, lighter units, while stricter noise and emissions regulations are pushing operators toward more fuel-efficient models. Growing military and business-jet fleets, combined with rising defence procurement, provide additional upside across both developed and emerging markets.

• •Rising commercial aircraft production, especially narrowbody platforms, drives new-fit APU volumes.
• •Replacement of legacy APUs to meet emissions and noise rules fuels aftermarket and retrofit demand.
• •Expansion of business-aviation and defence fleets supports diversified growth.

By platform, the market is led by commercial aircraft APUs, followed by business jets, military aircraft, and smaller non-aviation applications. By power source, conventional gas-turbine APUs dominate today, but electric and hydrogen fuel-cell APUs are emerging as the fastest-growing sub-segment. Regionally, North America holds the largest share due to its large installed aircraft base and strong MRO sector, while Asia-Pacific is the fastest-growing region as Chinese, Indian, and Southeast Asian carriers expand their fleets and local MRO capacity scales up.

• •Commercial aircraft is the dominant platform segment; business jets and military are key secondary segments.
• •North America leads on revenue; Asia-Pacific is the highest-growth region.
• •Turbine APUs dominate today; electric and fuel-cell APUs are the fastest-growing technologies.

Who are the notable companies in the industry?

The APU market is highly concentrated at the top, with a small group of tier-one engine and aircraft-system suppliers controlling most large-platform programs. Honeywell is the leading supplier across the widebody and many narrowbody platforms, while Pratt & Whitney Canada provides the dominant regional and business-jet APUs and is developing next-generation systems. Other notable participants include Safran, Collins Aerospace, and Technodinamika, with additional competition in the smaller and emerging electric-APU segment from companies such as Thales and various startups.

• •Honeywell is the leading APU supplier for most large commercial platforms.
• •Pratt & Whitney Canada is a major supplier for regional and business-jet aircraft.
• •Safran, Collins Aerospace, and Technodinamika provide additional competition across commercial and military segments.

What are the recent trends and outlook?

The most important trend reshaping the market is the transition to electric and hydrogen fuel-cell APUs, driven by airlines' commitments to net-zero operations and the maturation of high-power-density electrical systems. Tier-one suppliers are investing heavily in next-generation APUs expected to enter service in the second half of the decade, targeting 1–2% reductions in block-fuel burn. Steady growth in air travel, increasing defence budgets, and aftermarket service revenue are expected to keep the market expanding at mid-single-digit rates over the forecast horizon.

• •Electric and hydrogen fuel-cell APUs represent the clearest long-term technology shift.
• •Aftermarket services and MRO are an increasingly important revenue contributor alongside new-fit sales.
• •Sustained mid-single-digit growth is expected through 2030, supported by fleet expansion and modernisation.