325 



^ 



Direct Use of Gas (Continued) 



Total Energy Trajectory^ 



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

 Residential Space Heating' 



Direct Natural Gas Use 



Original Energy Polential 

 100% 



94.5% Efficieni Gas Production 



94.5% 



Cumulative Efliciency 



96.5% Efficient Gas Transmission & Distribution 



91.2% 



Cumulative Energy 



78% 10 9 1 % Efficient Gas Furnace 



71.1%to83.0% 



Cumulative Efficiency 



75% to 100% Efficieni Heal Delivery System 



E3.3%toB3.0% 



Final Delivered Energy Efficiency 



S355 10 S228 p/yeor @ $0,60 p/lherm 



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 



100% 10 200% Efficient Electric Heat 



37.6% to 75.2% 



Cumulative Efficiency 



75% 10 1 00% Efficient Heal Delivery Systen 



28.2% to 75.2% 



Final Delivered Energy Efficiency 



«677 to 8338 p/ye»r @ *0.05 pAwh 



'ToUl Entrgy Trijtctory Includit tfi« tot*/ »n»;yy rKju/rerf to extract preceai tnd ccnnrt § btilc »n»rgy ntourct tnd 

 dtllytr tht nsuldng tnargy to thi cuttomtr't mtttr. htlto lnetud»$ tntrgy UBtd by tppllinctt on th* cuMtomtr't »lde of 

 Ifw meler to crMtt u»ttul eneryy tucti u h»tt and to dlttribuf It wldiln th» houtt. SInct ippll*ne* »Hlchnel0t nry, the 

 tlntl dtllv»nd ittldanclf tnd tnnuil coats are givtn «• « nngt. 



'Btttd on t ryplCMl nsldtnUtI iptc* hul lotd ol 15 million Btui ptryttr. 



Association of Northwest Gas Utilities -- 1993 



25 



