Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_23958917_1 (in_service_dates VARCHAR, owner_s___2009_ VARCHAR, location VARCHAR)
### Question:
Name the number for service dates for hoosier energy for petersburg
### Answer:
SELECT COUNT(in_service_dates) FROM table_23958917_1 WHERE owner_s___2009_ = "Hoosier Energy" AND location = "Petersburg"