How do I report GADS data on combined cycle units?
Basically, two methods exist for reporting performance and event data on combined cycle units, as shown below. Solomon recommends reporting them as individual components since this method allows for more detailed analysis of the combustion turbines (CTs), as well as the steam cycle. 1. As a single combined unit (all of the CTs and steam cycle are considered one large combined unit) Historically, NERC has recommended this method. In this scenario, most component outages (e.g., a CT forced outage) result in a derating for the combined unit. Attempted and actual starts are not counted unless the entire combined unit “starts”; the combined unit is not considered offline until the last component’s breaker opens and is considered to be online when the first component’s breaker closes. The combined unit is generally considered to be “available” when at least one of the components is available. Normally, the combined unit is assigned a unit code between 800 and 899, and the unit type is consid
