SoCalGas A Sempra Energy Utility

SoCalGas ENVOY®
 
SDG&E Wobbe Index
Disclaimer Printable Version
Last Updated 04/03/2026 01:16 AM PCT
SDG&E Location/Description Billing Zone Wobbe Index
 Coastal North  Thermal Zone 1  1332
 Inland North  Thermal Zone 2  1341
 Inland South  Thermal Zone 3  1339
 Coastal South  Thermal Zone 4  1339
 Border South  Thermal Zone 5  1338
 Inland Central  Thermal Zone 6  1337
System average Btu value is Btu/scf.
For a map of the thermal zones please click here.
The Wobbe number, or Wobbe index, of a fuel gas is found by dividing the high heating value of the gas in Btu per standard cubic foot (scf) by the square root of its specific gravity with respect to air.
For information regarding your facilities location, please contact your SDG&E representative.