CREATE TABLE table_70003 ("Unit" TEXT, "Reactortype" TEXT, "Net capacity" TEXT, "Gross capacity" TEXT, "Construction started" TEXT, "Electricity Grid" TEXT, "Commercial Operation" TEXT, "Shutdown" TEXT)

Which Commercial Operation has both a Gross Capacity of 417 mw and an Electricity Grid 27.12.1971?
SELECT "Commercial Operation" FROM table_70003 WHERE "Gross capacity" = '417 mw' AND "Electricity Grid" = '27.12.1971'
SELECT "Commercial Operation" FROM "table_70003" WHERE "Electricity Grid" = '27.12.1971' AND "Gross capacity" = '417 mw'