AS TET Estel
Aircraft Ground Power Units (GPUs), 400 Hz Converters, Aviation Power Solutions
Founded in 1870, Tallinna Elektrotehnika Tehas “ESTEL AS” (TET ESTEL) is a European manufacturer of power conversion equipment with more than 155 years of engineering heritage.
TET ESTEL specializes in the design and manufacture of Aircraft Ground Power Units (GPU), 400 Hz frequency converters, and aviation power supply systems for airports, airlines, MRO facilities, and aviation infrastructure projects worldwide.
The company has been active in the aviation sector since 1974, developing and supplying ground power solutions for aircraft ground handling operations.
Today TET ESTEL offers a complete portfolio of aviation ground power equipment including:
- Solid-state Ground Power Units (GPU)
- Battery-powered eGPU solutions
- Diesel Ground Power Units
- 28/56 V DC airfield rectifiers
- 400 Hz frequency converters
In addition to standard products, TET ESTEL is actively involved in complex aviation infrastructure projects requiring custom engineering, system integration, and project-specific configurations.
All solutions are designed for reliable 24/7 operation and full compatibility with modern aircraft fleets including Airbus, Boeing, Bombardier, and regional aircraft platforms.
To date, more than 7,000 aircraft ground power units supplied by TET ESTEL are operating worldwide, supporting efficient, reliable, and environmentally responsible aircraft ground operations.
More information can be found at: https://tet-estel.com
Aviation GPU Solutions for Civil & Special-Purpose Infrastructure Projects
TET ESTEL supplies Ground Power Units (GPU) for civil aviation, supporting reliable aircraft ground operations at commercial airports, remote stands, and MRO facilities.
Our solid-state, diesel, and battery-powered GPUs are engineered for continuous 24/7 operation, high power quality, and full compatibility with modern narrow-body, wide-body, and regional aircraft fleets
The solutions help airports reduce APU usage, lower emissions and noise, and improve overall operational efficiency and cost performance.
TET ESTEL provides ground power solutions for complex aviation infrastructure projects with increased reliability and operational requirements.
The GPUs are engineered for demanding operating conditions, continuous 24/7 operation, and compliance with relevant aviation and international standards.
Custom configurations and project-specific engineering enable support for a wide range of aircraft types, helicopters, and specialized operational profiles.
SERVING CIVIL AND SPECIAL-PURPOSE AVIATION INFRASTRUCTURE WORLDWIDE
Ground Power Solutions for Aviation
All types of Ground Power Units (GPU) and Rectifiers designed for fixed, mobile, and under-bridge installations across all airport zones.
Airports, Airlines, Ground Handling, MRO, Special-Purpose, Business Aviation, Integrators
Our systems help reduce APU usage, lower emissions and noise, and integrate seamlessly into both new and existing airport power infrastructure.
AIRPORTS AIRLINES GROUND HANDLING MRO SPECIAL-PURPOSE BUSINESS AVIATION INTEGRATORS
Why TET ESTEL
European engineering • Proven aviation expertise • Custom solutions • Long-term reliability
- European engineering & manufacturing
- EU-based design and manufacturing with full control over quality, compliance, and long-term product support
- 155+ years of engineering heritage
- Established in 1870, with long-standing expertise in power electronics and critical infrastructure
- Aviation expertise since 1974
- Decades of experience in civil aviation and complex aviation infrastructure power solutions
- Complete Ground Power portfolio
- Solid-state, diesel, hybrid, and battery-powered GPUs, including integrated AC and DC solutions
- Custom engineering & turnkey projects
- Non-standard configurations, system integration, and full project responsibility from design to commissioning
- Proven reliability & continuous operation
- Engineered for reliable 24/7 operation in demanding airport and aviation infrastructure environments
- In-house testing & quality assurance
- Every unit is tested at TET ESTEL’s dedicated test facility prior to shipment, ensuring verified performance, compliance, and operational reliability
- Plug-and-play solutions
- Designed for fast installation and straightforward commissioning, minimizing on-site work and reducing time to operation
- After-sales support & lifecycle services
- Long-term technical support, documentation, and service assistance throughout the entire product lifecycle
- International standards compliance
- In accordance with ICAO, ISO, and relevant aviation and international standards
- Lower total cost of ownership (TCO)
- High efficiency, modular design, and long service life reduce operating and maintenance costs
Exhibitions & Industry Events
Meeting our partners and customers worldwide
TET ESTEL actively participates in international aviation and GSE exhibitions, meeting airport authorities, MRO organizations, government and special-purpose aviation customers, and system integrators worldwide.
Industry events allow us to showcase our latest ground power solutions, discuss upcoming projects, and exchange expertise with aviation professionals.
We value direct communication and long-term partnerships — exhibitions are an important part of how we stay connected to the global aviation community.
Products
Ground Power Unit (GPU) - Solid-state 400 Hz
COMBINED AC/DC GROUND POWER UNITS
AIRCRAFT RECTIFIERS
HYBRID DIESEL GROUND POWER UNIT
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