NOTE: All prices published in the is chart represent the delivered cost of gas at the listed locations based on adding tariff rates to U.S. spot market prices, as listed above. The formulas used to calculate transportation costs are based on effective tariffs that were in place as of 1/1/18, and are subject to change as pipeline tariffs are revised. We only include variable charges from U.S. interstates (El Paso Natural Gas, North Baja, Sierrita Pipeline, and Tennessee Gas Pipeline), while we include both variable and demand charges from U.S. intrastate lines (Kinder Morgan Texas, NET Mexico) and Mexico pipes (SISTRANGAS and KM Mexico). Mexico prices are "citygate" equivalents, and do not include distribution costs. $US/MMBtu converted to MX/GJ using the exchange rate listed in the sub-title, plus a conversion rate of 1.055056 GJ/MMBtu. On days when the Houston Ship Channel does not post a price in NGI's Daily GPI, we will use the most recent published price for these calculations. Questions? Comments? Suggestions? Plese contact us at