CREATE TABLE table_27130 ("Wind farm" TEXT, "Installed capacity  ( MW ) " TEXT, "Turbine Manufacturer" TEXT, "County" TEXT, "Date in Service" TEXT)

When did the wind farm in Musselshell started service?
SELECT "Date in Service" FROM table_27130 WHERE "County" = 'Musselshell'
SELECT "Date in Service" FROM "table_27130" WHERE "County" = 'Musselshell'