CREATE TABLE table_71613 ("Date" TEXT, "Company" TEXT, "Business" TEXT, "Country" TEXT, "Value  (  USD  ) " TEXT)

In the United Kingdom, what company has an unknown date and is an energy business?
SELECT "Company" FROM table_71613 WHERE "Business" = 'energy' AND "Date" = 'unknown' AND "Country" = 'united kingdom'
SELECT "Company" FROM "table_71613" WHERE "Business" = 'energy' AND "Country" = 'united kingdom' AND "Date" = 'unknown'