II. Data Analysis

A. Capacity Unavailability Factor (CUF)

As a minimum the CUF shall be calculated once per calendar month for each generating asset. Once per quarter, the mean value of the monthly CUF shall be calculated and plotted for trends. The trend will be compared with the benchmark data for each generating asset (see paragraph III-A of this section). A suitable means shall be developed for generating asset owners to quality check the calculations. Declining trends, or performance outside the benchmark control values as set forth in performance analysis thresholds, below, will be further analyzed by the CPUC using information from additional data analysis.

B. Additional Data Analysis

1. Internal CPUC information will be examined, including such outage coordination information as planned, approved, deferred, cancelled or forced outages. Review of "Restricted Generation Maintenance Periods" and other information that might have bearing on unit performance will be included.

2. The CPUC also will have at its disposal, either through authorized access to NERC GADS Unit Specific Data, or directly supplied data from the GAO, sufficient data to analyze, track, trend and query as required to test the apparent results of CUF calculations and the implications on generating asset owner's maintenance program effectiveness. Particular interest will be applied to those performance metrics that reflect recent changes in operating practice that may impact CUF other than the maintenance program. As a minimum these shall include:

a. Net Actual Generation for the period compared to historical

b. Actual starts for the period compared to historical

c. Service hours for the period compared to historical

d. Outage hours for period compared to historical

C. Evaluation of Data Anomalies

If, following this analysis, additional information is needed to understand the generating asset's performance; the CPUC will initiate queries with the generating asset owner. These queries may be conducted via telephone conference or site visits, as the CPUC deems necessary.

D. Audit

If, following analysis and preliminary investigation, performance remains questionable; it will be further evaluated by the CPUC performing a "triggered site audit". The purpose of the audit is to assure that the cause of the decline or performance issue has been identified. The generating asset owner can then develop actions to remedy the situation. Such audits shall be conducted in accordance with guidance in Section 3 of the Generation Maintenance Program, Verification and Audit Process.

E. Confidentiality

The CPUC recognizes the proprietary nature of the data and information provided (directly and via NERC GADS) by the generating asset owners, and agrees to treat the information in a manner that protects the proprietary interest of the generating asset owners from other parties.