326 



&. 



Direct Use of Gas (Continued) 



Total Energy Trajectory' 



Direct Natural Gas Use vs. Combined Cycle Combustion Turbine Electric Generation 



Residential Water Heating^ 



Direct Natural Gas Use 



Original Energy Potential 

 100% 



94.5% Efficient Gas Production 



94.5% 



Cumulative Efficiency 



96.5% Efficient Gas Transmission & Distribution 



91.2% 



Cumulative Energy 



53% to 70% Efficient Gas Water Heater 



48.3% to 63.8% 



Final Delivered Energy Efficiency 



S179 to $135 per year @ 50.60 per therm 



Gas-Fired Electric Generation 



Original Energy Potential 

 100% 



94.5% Efficient Gas Production 



94.5% 



Cumulative Efficiency 



96.5% Efficient Gas Transmission & Distribution 



91.2% 



Cumulative Efficiency 



44.8% Efficient Combined Cycle Turbine 



40.9% 



Cumulative Efficiency 



92% Efficient Elec. Transmission & Distribution 



37.6% 



Cumulative Efficiency 



84% to 95% Efficient Electric Water Heat 



31.6% to 35.7% 



Final Delivered Energy Efficiency 



$275 to $243 per year @ $0.05 per kwh 



'TottI Entrgy Tnltctory IncludeB tft» toUl »ntrgy r*qulr*d to txtnct, prvcttM tnd convtn * b*slc tntrgy ntourc* ind 

 dtllvtr tf)« ntulUng tntrgy to th* cuHomtr'i mtfr. (t »J»o lncludt$ tntr^ uttd by »ppllMnc*$ on tht cuitomtr'* Bidt ol 

 th» m*ltr to crtif u$ttul tntrgy »"<* " '•••' •"'' "> """rf*"" " w/tfi'n tf" hovt. SInct tppllinc* »ttlcltncl»$ v»ry, tf>« 

 tinti dtllvnd tttlchnclti tnd tnnusl coil* (rt givtn «« « nnga. 



'65 to 74 gallon lint heurnUng tnd IS mllUon Btv ptr ytr wttir htti load. 



Association of Northwest Gas Utilities -- 1993 



26 



