Which Electricity Grid started its Commercial Operation of 24.03.1973?
CREATE TABLE "reactor_data" (
  "unit" text,
  "reactortype" text,
  "net_capacity" text,
  "gross_capacity" text,
  "construction_started" text,
  "electricity_grid" text,
  "commercial_operation" text,
  "shutdown" text
);
SELECT "electricity_grid" FROM "reactor_data" WHERE "commercial_operation"='24.03.1973';