Index Plus Block Electricity Pricing

Index Plus Block


Index Plus Block customers fix a certain volume of their usage at a specific rate, leaving the remaining unfixed portion on the market-based index rate. Index Plus Block provides businesses with options to layer in portions of your usage to optimize when and how much energy you use in response to market-based prices.

The three options for fixing business electricity supply blocks include:

  • Base "standard" wholesale block (7 x 24 periods)
  • Peak blocks (5 x 16)
  • Off-peak blocks

Any unfixed portion remains on the market-based index rate chosen from either Day Ahead or Real Time indices, depending on the wholesale market.

Features and Benefits

With the Index Plus Block solution, business customers can:

  • Determine how much electricity to purchase at a fixed price and adjust the volume based on market opportunities, rather than locking in to a fixed price that may be at the top of the market.
  • Take a more granular approach by layering in portions of electricity usage to optimize when and how much they use in response to market-based prices—including shifting load from peak to off-peak periods.
  • Avoid paying for extra risk protection (variable load cost).
  • Opt to fix or pass through the costs of ancillaries, capacity and transmission —depending on the wholesale market rules and system limitations.
  • Purchase renewable energy certificates to "green" a percentage of your usage.

Why Customers Choose Constellation

Constellation can provide pricing information to help you decide when to purchase electricity. Our analysis of historical and forecasted consumption can also help you determine what size blocks to purchase to best mitigate your risk to volatile market prices.

Ready to begin discussing whether the Index Plus Block option makes sense for your business? Have one of our Business Development Managers contact you.


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These materials are provided by Constellation NewEnergy, Inc., Constellation Energy Power Choice, Inc., Constellation Energy Gas Choice, Inc., Constellation Energy Services, Inc., Constellation Energy Services – Natural Gas, LLC, or BGE Home Products & Services, LLC (d/b/a BGE Home, Constellation Electric and Constellation Home in Maryland and d/b/a Constellation Home in Pennsylvania and Texas), each a subsidiary of Exelon Corporation. Exelon Corporation also owns Baltimore Gas and Electric Company (BGE), ComEd and PECO energy companies. BGE Home Products & Services, LLC, is not the same company as BGE, the regulated utility. The prices of Constellation are not regulated by any state Public Utility Commission. You do not have to buy Constellation electricity, natural gas or any other products to receive the same quality regulated service from your local utility. Brand names and product names are trademarks or service marks of their respective holders. All rights reserved. Errors and omissions excepted.

Electricity or Gas Supplier License #s: CT DPUC Docket No.99-11-14 07-03-08, 06-02-17; GA PSC License Docket #: 22253, GM-33; IL #s 11-0394, 10-0540, 02-0489; 10-0129, 07-0279, MD License #s IR-228, IR-1853, IR-311, IR-327, IR-500; MA License #CS-045; MI Case #U-14066, U-13660; NJ License #ESL-0016, ESL-0066; GSL-0074; OH #s 00-003E(7); 02-021G(6); PA#s A-125050, A-110036, A-110186; Washington D.C. Supplier License Docket EA01-5, EA-06-5-4, #GA-2012-12, GA-11-5