CREATE TABLE table_42978 ("Name" TEXT, "Location" TEXT, "Field" TEXT, "Capacity  ( MW ) " FLOAT, "Annual Generation  ( average GWh ) " TEXT, "Commissioned" TEXT)

What Field was Commissioned in 1958, 2005?
SELECT "Field" FROM table_42978 WHERE "Commissioned" = '1958, 2005'
SELECT "Field" FROM "table_42978" WHERE "Commissioned" = '1958, 2005'