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    The Curtailment program is designed to allow MidAmerican Energy's large commercial and industrial customers in Iowa and Illinois to receive financial incentives for reducing peak electrical demand. The Curtailment program is designed to level out peaks in the demand for electricity during the summer season June through September – when electric demand is greatest. The program also helps to maintain the resilience and reliability of the grid during emergency conditions for the entire year.  Industrial or commercial customers capable of reducing electricity use by 250 kW or more during peak demand periods are eligible for the program.
    How does it work?
    MidAmerican Energy will help you calculate an expected summer demand (the amount of electric demand your facility normally places on our system between 3 and 5 p.m. June-September), a firm power level (the minimum, or base level of electric demand to which you agree to reduce your consumption) and your load available for curtailment (summer curtailable load).
    Sample summer calculation:
    1,000 kW Expected Demand (3 - 5 p.m.)
     -750 kW Firm Power Level
      250 kW Curtailable Load
    MidAmerican Energy also will help you calculate your curtailable load for the non-summer season. The non-summer curtailable load will be equal to the lesser of
    • the summer curtailable load or
    • the monthly non-summer demand, less firm demand level, based on the participant's previous calendar year energy consumption
    Program details:
    • Participants are required to sign up for the entire year (June 1 – May 31).
    • Events run for a maximum of six hours each.
    • MidAmerican Energy's key account managers contact participants to issue warnings of potential peak periods two to six hours before actual events.
    • During events, customers must reduce their use of electricity supplied by MidAmerican Energy by their contracted amount.
    • The reduction can be achieved by limiting air conditioning, reducing or shifting the operation of other equipment, or by using auxiliary on-site electrical generation.
    • Participants are required to provide a data communication line (telephone or Internet TCP/IP) for interval data transmission.
    • In Iowa and Illinois, this program is governed by Iowa electric tariff Rider CS and Illinois electric tariff Rider CS, respectively.
    How can my business help save energy?
    Save energy by simply reducing electricity use by your contracted amount at MidAmerican Energy's request. Demand reductions can be achieved by limiting air conditioning use, reducing other equipment operation or using a standby generator.
    When will I be asked to curtail?
    • During the summer season – June through September – when electric demand is the greatest
    • During any season due to MISO-declared emergency conditions
    • During any season due to MidAmerican Energy's transmission and/or distribution system's operating conditions
    MidAmerican Energy will provide a warning that a curtailment event is possible at least two to six hours in advance.
    What happens if I can't comply when I'm asked to curtail?
    • Compliance with all mandatory curtailment requests is important. MidAmerican Energy must maintain a reserve of electric capacity. By curtailing your electric use during periods of high energy consumption or emergency events, you help us maintain this important reserve and the resilience and reliability of the grid.
    • If you fail to curtail when requested, MidAmerican Energy may be required to purchase additional capacity to cover the shortfall and may incur financial penalties. You may be asked to pay your proportionate share of these added expenses; however, your share will not exceed your annual curtailment credit.
    • If you fail to curtail to your summer demand by your contracted curtailable load amount, MidAmerican Energy may reduce your contracted summer curtailable load and/or expected demand or disqualify you from participating in future years.
    • If you are unable to curtail due to a one-time failure of your standby generating equipment and notify MidAmerican Energy immediately, we may waive any or all consequences noted above.
    If you are notified to curtail and find you are unable to decrease your load to the firm power level, contact MidAmerican Energy immediately.
    How do I participate? 
    • Contact your key account manager to calculate your company's curtailable loads. You also may contact MidAmerican Energy at or call 866-584-0871.
    • Complete and return a Curtailment Program Application prior to March 15 of the contract year.
    • New applications will be processed on a first-come, first-served basis.
    May I cancel or change curtailment levels?
    Customers are required to participate for the entire plan year, as defined by MISO as June 1 through May 31.