What is ETC?

Find out what Electric Turbo Compounding (ETC) systems are, how they work and why they differ from other technologies such as organic rankine cycle.

Increased efficiency for the power generation industry

At Bowman, we believe there is a strong environmental and economic duty to ensure that, where reciprocating engines are used to generate power, fuel is consumed as efficiently as possible. Electric Turbo Compounding (ETC) technology is our solution to the challenge of improving energy efficiency for the stationary power generation industry.

Our ETC products make gas and diesel-powered gensets* work more cleanly and effectively, by recovering waste energy from the genset exhaust to improve power density and fuel efficiency. Our ETC systems are a quicker and cheaper approach to improving energy efficiency than engine manufacturer modifications.

We’ve achieved this by combining long standing principles in turbo compounding with our own modern approach to high-speed electrical machines (HSEM). We combine a turbo generator with a power electronics unit, whilst also replacing or modifying the engine turbocharger based on customer requirements.

How does ETC compare to other energy efficiency technologies?

When compared to other technologies, such as organic rankine cycle (ORC), our ETC systems are:

  • More compact
  • Easier to install
  • Much lower cost per kWh generated
  • In active production, unlike other experimental technologies
  • Proven in the field, with over 800 systems in use
  • Tested and validated by OEMs and independent research bodies
  • Refined and improved by 15 years of R&D

ETC system range:

The technology is equally suited to new-build and retrofit applications, for engines in the 150kW-2.5MW range. We have also developed bespoke high-speed electrical machines for much larger engines with waste gated turbochargers, such as the Wärtsilä 34SG, a 9MW gas engine (view full case study).

View our full range of products here.

Our ETC technology is proven on a wide range of engine types, including:

  • CAT 3516 TA/LE
  • Cummins KTA50-G3
  • Cummins KTA50-G8
  • Cummins QSK60
  • Cummins QSK78
  • Jenbacher J312
  • Jenbacher J320
  • MAN 2842
  • MAN D2676
  • Mitsubishi 6R41
  • MTU 4000
  • Scania DC 12
  • Volvo TAD1642
  • Wärtsilä W20V34SG
  • Wärtsilä W18V50SG

Don’t see your engine above? There are many more engines we can support. To find out how we can help, and view performance simulations please get in touch.

* Gensets comprise an engine and generator, and are also known as generator sets.

ETC applications and benefits

Through integrating our ETC technology with your products and engines you can deliver an enhanced offering that increases power generation capacity.

  • Proven applications on a range of genset sizes
  • Suitable for open or containerised gensets
  • Enhanced offering for genset end-users
  • Increased competitive advantage
  • Reduced fuel consumption, between 4-7%
  • Fewer carbon emissions
  • Generate additional power, up to 10%
  • Rapid payback, even with low fuel prices
  • Over 800 systems sold worldwide
  • Proven reliability record
  • Over 20,000,000 running hours