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Index Prices

The ISO-NE market consists of day-ahead and real-time markets. The day-ahead market is a forward market in which hourly LMPs (Locational Marginal Pricing) are calculated for the next operating day based on generation offers, demand bids and scheduled bilateral transactions. This is often noted as DA LMP. The real-time market is a spot market in which current LMPs are calculated at five-minute intervals based on actual grid operating conditions. This is often noted as RT LMP.

The map below shows the current real-time zonal prices for the ISO-NE regions.


 The information contained in these reports is gathered from public and/or internal sources and is presented solely for the convenience of our customers and website viewers. GDF SUEZ Energy Resources makes no representation or warranty, express or implied as to the accuracy, completeness or fitness for any particular use or purpose of the information set forth in this report, and GDF SUEZ Energy Resources shall not have any liability to any person or entity resulting from use of this information in any way.



What is our source for current ISO-NE index prices?
ISO-NE provides index prices on its website

How is the zonal price determined?
The cost to serve retail customers across the state varies by node and zone. Massachusetts is divided into three zones and dozens of nodes. The zonal price is the weighted average price for all the nodes within the zone.

What is the difference between real-time and day-ahead markets?
Suppliers can purchase power from the day-ahead market to meet the following day's forecasted usage. The real-time market is a balancing market where generators bid on excess demand intraday. An energy consumer on the real-time index will pay a different rate each interval based on the winning bid. GDF SUEZ Energy Resources offers index products based on both the real-time and the day-ahead markets.

Should I choose an index based energy contract?
Contact your account manager at GDF SUEZ Energy Resources to discuss the pros and cons of index-based pricing. Each customer has different needs and levels of risk tolerance. A well-informed account manager can help you to determine the product option that is best for you.


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