What are those devices they put on our air conditioners last year?

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We signed up for a program called Summer Discount Plan offered by SoCal Edison.  They put devices on the compressors of the HVAC units that would allow them to cycle the compressors off during a high demand "event".  Ventilation would not be affected.  In exchange for giving them this option, we received over $425,000 in the first year with no events called and are approaching $400,000 in year 2!  

 Total discounts after 3 years on this plan: $1,250,000.00!