> Then I'll have a table with the corners of each grid area, and an impact 
> value.  How would I convert this into a custom tile layer?

Each type of generation capacity ( Wind, Solar, Coal, Natural Gas,
Nuclear, Peat, etc.) has it's own 'impacts'. There are already a
number of sites out there which provide various data, some via Web
mapping Services. The 'impact' is rarely evenly distributed because of
wind patterns, hydrology, terrain, etc. For instance, coal gives off
particulates, see 
http://disc.sci.gsfc.nasa.gov/oceancolor/additional/science-focus/locus/index.shtml/air_pollution.shtml
and    
http://disc.sci.gsfc.nasa.gov/oceancolor/additional/science-focus/locus/air_pollution.shtml#google

For free GIS, I heartily recommend:
"Quantum GIS (QGIS) is a user friendly Open Source Geographic
Information System (GIS) licensed under the GNU General Public
License. QGIS is an official project of the Open Source Geospatial
Foundation  (OSGeo). It runs on Linux, Unix, Mac OSX, and Windows and
supports numerous vector, raster, and database formats and
functionalities."
... at http://qgis.org/

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