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~ usbr/wapa In late July, Western and Reclamation reported to the AMWG its recent decisions. Western statt:u that this was an '.intt:rim" mt:asure until it was able to review interpretation of the ROD and further discuss this with Reclamation and with the AMWG. This paper follows up on the two agencies' coommitments to the AMWG. II. The Relationship Between Reclamation and Western Rel!ardinlf Operatinlf Glen Canvon Reclamation's Upper Colorado Region Water Office makes monthly water release schedules in acre-feet for Glen Canyon based upon anticipated inflows to the lake, release requirements to the lower basin and storage targets for the lake. This monthly water schedule is passed on to Western's Resource Scheduling Office in Montrose, CO. Western's scheduling office then develops an hourly release schedule. This schedule takes into account Glen Canyon ROD requirements and the requirements and agreements made by Western and Reclamation regarding the operation of the other CRSP powerplants. Western's dispatch office in Phoenix, Arizona then provides Reclamation's Glen Canyon Power Operations Center with a daily, 24 hour operating schedule, identifying Western's desired hourly electric power schedule (in megawatts). This schedule is then put into the computer system at Glen Canyon by Reclamation2. This schedule then becomes the megawatt quantities which are targeted during the "real time" operation at Glen Canyon Dam. The Glen Canyon Power Operations Center operators utilize the generation schedule supplied by Western to operate the generating units while giving consideration to efficiency and equipment characteristics. In addition, the generators automatically respond to a "regulation signal" developed and electronically transmitted to the dam by Western for continuous response to power system load and frequency changes. (This is further described later in this paper). III. Recent Historv ofthe "Flexibility" Within Operation Constraints Shortly after Interim Flows began (August, 1991), Western met with staff at the Glen Canyon Environmental Studies (GCES) and with other Reclamation representatives. Western requested flexibility in order to regulate an electrical control area. This resulted in an agreement whereby Western was allowed to fluctuate 10% around any operational constraint and that Western would meet with GCES staff monthly to discuss any operational issues that surfaced. Thus, the Interim Flow downramp requirement of 1,500 cfs could be as high as 1,650 cfs and still be in compliance (1.500 cfs + 150 cfs). 2 This computer "system" consists of hardware and software and has the name of Supervisory Control And Data Acquisition (SCADA), 2