"PG&E" refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation. © 2023 Pacific Gas and Electric Company. All rights reserved.
CGT uses the system composite temperature in addition to other information to estimate gas demand on the system. Demand and supply forecasts are used to create the System Inventory Forecast. When the System Inventory Forecast indicates pipeline inventory is trending toward the upper or lower limit, an Operational Flow Order may be announced. The composite temperature forecast is shown on Pipe Ranger's Current Pipeline Status page on the top line of the daily plan.
How It's Calculated
The PG&E system composite temperature forecast is based on the weighted sum of the average daily temperatures at six sites: Sacramento, San Jose, Oakland, Fresno, Redding and Salinas. An example is shown in the following table.
| Weather Site | Average Temperature | Weight | Avg Temp x Weight |
|---|---|---|---|
| Sacramento | 71.3 | 0.39516 | 28.2 |
| San Jose (New) | 66.3 | 0.28400 | 18.8 |
| Oakland | 63.1 | 0.17977 | 11.3 |
| Fresno | 78.9 | 0.05873 | 4.6 |
| Redding | 74.2 | 0.04216 | 3.1 |
| Salinas | 64.2 | 0.04018 | 2.6 |
| System Composite Temperature | 68.6 |
If you have additional questions regarding the system composite temperature, please contact a CGT Account Manager