Looks like Turbo compound for diesel trucks is becoming off the
shelf.

http://www.voithturbo.de/vt_en_paa_road_motorenkomponente_turbocompound.htm


"TurboCompound
According to the European Exhaust Gas Norm Euro 5, from October 2009, the borderline value for the emission of soot particles from heavy commercial vehicles will be set at 0.02 g/kWh. Nitric oxide emissions must not exceed a value of 2 g/kWh. It is assumed that from 2012, regulations will be even stricter with the introduction of Euro 6. Engine-related measures aiming at meeting this Euro 6 norm lead to increased fuel consumption. By utilizing the thermal energies occurring within the exhaust fumes, TurboCompound systems help to save up to 3 percent fuel. Consequently, CO2 emissions also drop. Voith Turbo supplies hydrodynamic couplings and pre-assembled systems for such TurboCompound systems."

The 3% is an under estimation. DD claims 5%. Voith is not making the turbine
apparently.

Note the trade off between Nitric oxide emissions and fuel consumption.

Nitric oxide never hurt anybody :) OK send me the proof!

Like CO2 plants probably love it :)

Also I'll bet that particle filter adds back pressure.

Paul Lamar