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Text Box: Dispatchable......The DI2 supplemental residential space heating system is based upon the concept of electric utility real-time load control.  The DI2 system is selectively activated (dispatched) by the utility during those periods when the incremental cost of electricity generation is competitive with alternative home heating fuels (No.2 oil and natural gas).  This condition generally occurs during weekday nights and on weekends when electricity is primarily being supplied by hydro, nuclear, waste recovery, and combined cycle electric generating sources.  During these periods the cost of additional generation can be one cent or less.
Interruptible......Because the DI2system will only be activated when low cost generation is available, the system must be fully interruptible.  The availability of low cost generation is dependent upon the operating status of the various system generators and the magnitude of the firm load on the suppliers electric system. Under normal conditions low cost energy will be available each weekday night and during weekends.  However, this condition cannot be guaranteed and therefore the energy supplier to the DI2 system must have the ability to interrupt power supply at any time and for any duration to satisfy firm, rate base load.  Energy supply to the DI2 system is at the discretion of the energy supplier, who has no obligation to provide any service under the DI2 agreement.  This type of service is unlike existing traditional "Time-Of-Use" rate structures where the utility makes the commitment to make available specific electric services at specific times.
Incremental.....In establishing the various regulated rate structures, a determination of the current and projected electrical loads for the various types of service is made by the local utility whenever a "rate case" is filed with the Department of Public Utilities. Based upon the projected Kwh sales, electric rates are established which will result in recovery of funds necessary to cover debt, operating costs, overhead, and a regulated amount of profit.  Because the DI2 system does not represent load which previously existed as an electric load, nor does it reduce or shift current or projected electrical loads upon which base rates are established, the DI2 load is truly incremental.  Finally, the DI2 system requires no additional investment in the distribution system infrastructure.
Based upon these principles, the DI2 system provides a means by which the residential
customer can more fully utilize the electric supply system infrastructure to achieve
more efficient, cost saving space heating.