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Subject: Definition of a "Price Interval"


This came up during last week's eMIX TC meeting -- What is the definition of price interval? What elements/attributes are comprised in it?

For any price, there should be a standard "Time" factor associated with it (unless the exception is there is "one" price for all periods).


I think we should make a key distinction of price schedule versus the interval (if we ever can) and how the generic price intervals are different from their definition in DR signals (the notion of DR events).

Let's say for example, a price-responsive DR event in OpenADR may look something like this (I am not saying this is how eMIX should address it as the goal of sending the information and subsequent response may differ) --

        <p:drEventData>
           <p:notificationTime>2010-02-08T15:17:21.000-08:00</p:notificationTime>
            <p:startTime>2010-02-09T00:00:00.000-08:00</p:startTime>
            <p:endTime>2010-02-09T23:59:59.000-08:00</p:endTime>
            <p:eventInfoInstances>
                <p:eventInfoTypeID>PRICE_ABSOLUTE</p:eventInfoTypeID>
                <p:eventInfoName>price</p:eventInfoName>
                <p:eventInfoValues>
                    <p:value>0.03638841</p:value>
                    <p:timeOffset>0</p:timeOffset>
                </p:eventInfoValues>
        </p:eventInfoInstances>
        </p:drEventData>

What you see above is a definition of time slot (start and end time) that has various attributes associated with it. Other attributes could be for example, load shed, % shed, etc. However, all of these attributes are associated with one time-slot notion, which is defined by the period of DR event.

Thank you,
RIsh

--
Rish Ghatikar
Lawrence Berkeley National Laboratory
1 Cyclotron Road, MS: 90-3111, Berkeley, CA 94720
GGhatikar@lbl.gov | +1 510.486.6768 | +1 510.486.4089 [fax]

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