Where can I find up to date EnergyPlus utility tarriffs

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In most cases, you will probably need to create the EnergyPlus description based on the latest tariff information from the utility. Often the structure of the tariff does not change over time but the values used in the tariff do so you might be able to use an old EnergyPlus tariff description for a utility and just update the numbers.

There is no direct connection to EnergyPlus, but a great resource for utility tariffs can be found at: http://en.openei.org/apps/USURDB/