human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Name, Location, Act. Units, Stacks, In Service Dates, Unit Capacity (2009), Nameplate Capacity (2009 MW ), Owner Type, Owner(s) (2009)
###Question: Name the number for service dates for hoosier energy for petersburg
gpt
SELECT COUNT In Service Dates FROM table WHERE Owner(s) (2009) = Hoosier Energy AND Location = Petersburg