With a variable index price, what is my price???

The market price charge equals the weighted average of the Real Time Locational Marginal Prices (“LMP”) for the zone you are located in for each calendar month. LMPs are hourly wholesale prices in dollars per megawatt-hour (MWh). Wholesale prices are converted to retail prices by adding distribution losses of 4.48% and dividing by 1000 to convert to dollars per kilowatt-hour (kWh).  To this number you add the “adder” that the electicity supplier charges.

If you are interested in source data for market price charges, you can access New England wholesale LMP data on the ISO-NE websiteVisit our resources page for links to the Independent System Operator (ISO) for your particular location:

At the destination page:

  • In Step 1, select “Load Zone.”
  • In Step 2, select your Load Zone.
  • In Step 3, select the start and end dates you wish to receive .
  • Click “Download CSV” (comma separated values) and save the file locally. You can open the file with any text editor or spreadsheet program, such as Microsoft Excel.

In the data file, the LMP data can be found in the eighth column, which is labeled “Real Time LMP.” The twelfth column, labeled “Real Time Status“, indicates the Status of the real time pricing (“preliminary” or “final”). The monthly price will be calculated and posted after the end of each month, when all LMP data for the prior are final.  This is the number that will be used as the monthly LMP price.

Please note that a single query is limited to 45 days worth of data and that hourly pricing data is only available for the past 12 months.

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