Are there any Nuclear power plants that are co generation.

Plants that use the excess heat for some form of heating process?

are cogeneration reactors include the recently completed Cernovoda heavy water reactor in Romania. An older reactor has been co-generating for sometime.

Many Soviet era reactors were cogeneration reactors, including the fast reactor in what is today Kahzakistan.

Some commentary on the Soviet nuclear co-generation plan can be found here: http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?tp=&arnumber=661946&isnumber=14442 Regrettably for me, only the abstract is available.

Given the extraordinary saftety performance of nuclear power in comparison with dangerous fossil fuel plants - all of which kill continuously in normal operations, it is remarkable that more co-generation nuclear reactors have not been built.

Should humanity survive climate change - increasingly less likely - some very high temperature reactors, like molten salt reactors and HTGCR will probably give remarkable thermodynamic efficiency by generating electricity from some very high temperature chemical processes - thermochemical hydrogen for instance - wherein the electricity will be a side product.

For melting the oil out of tar sands and shale rock,
there is no need for cogeneration or electricity generation at all,
just use the direct heat of fission to melt the sand and rock!
Nucular energy will extend the yuppie brat car culture brazillions of years!

In fact, dangerous natural gas HAS been used for this purpose for years.

The fundie anti-nuke religion couldn't care less.