Thermoelectricity

What are your proposals?

No, not at the present state of art. The process is not very efficient, and is very costly at large scale.

There's research in progress:

http://repositorium.sdum.uminho.pt/bitstream/1822/15737/1/2011-01-0315_final.pdf

See also heat/energy recovery aside from the Seebeck effect:

http://www.akenergyauthority.org/PDF%20files/ArchiveConferenceMaterial/Study_Diesel_Exhaust-UAF.pdf

There's more out there if you search.

Thanks Lo Volt

New material provides 25 percent greater thermoelectric conversion ...

For what it's worth.

Unfortunately, you have that factor [ (TH-TC)/TH ] - the Carnot efficiency. This limits the recovery of energy from waste heat even with efficient conversion devices.

http://en.wikipedia.org/wiki/Thermoelectric_effect#Device_efficiency

Also look into energy harvesting applications where waste heat can be utilised to power very low current, low to no maintenance devices (like building sensors in special environments) where other methods (wired power, battery, wireless, vibration, etc) are inconvenient or too expensive.

This is currently a project that is going in power plants