california industrial energy efficiency market characterization study final report prepared for pacific gas and electric company san francisco by xenergy inc oakland december 2001 table of contents oa wpge0053 toc i section e executive summary 1 introduction 2 methodology 3 results usage group customer size 4 end use consumption 5 potential 7 motor systems lighting 8 space cooling 9 indirect boiler process heat 10 6 industry specific measures 11 review utility program information 12 tracking data evaluation 15 conclusions 17 implications future design 18 recommendations research activities 19