"This excessive imbalance is then effectively sold to (or purchased from) the pipeline and is a permanent transfer into (or out of) the storage inventory allocated for the balancing service. When these cash-outs are large, or when they cumulatively move in the same direction, the available storage inventory to support balancing services can be filled (or depleted). As a result, the balancing service available to the market is limited, impacting all customers." (Ex. 4, p. 8-9.)

35 Although the Gas OII Settlement resulted in PG&E offering a self-balancing service, no one has elected to take this service since the hearings in this proceeding concluded. This self-balancing service requires daily measurement of the imbalances. 36 The figures do not match because Table 1 is expressed in energy units, while the cubic feet amounts are in volumetric units. 37 PG&E's testimony states that the daily imbalances incurred by all balancing entity groups during calendar year 2000 and 2001 shows that only 2% of the daily imbalances exceeded the proposed daily limit. 38 If the 7:15 a.m. forecast is not available, then the most recent previous forecast would be used. 39 "Bumping" refers to the process where a firm shipper in later scheduling cycles can bump, or supersede, an as-available nomination confirmed in a previous nomination cycle. Under the NAESB nomination and scheduling process, firm contracts can bump previously scheduled as-available nominations during the second and third nomination cycles. Under the NAESB standard, bumping does not occur in Cycle 4. 40 The objective of the trading platform was to trade imbalances and backbone capacity contracts on an anonymous basis.

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