You will be given a definition of a task first, then some input of the task.
Indicate a text span in the passage about which an inquisitive question is asked. (note, don't answer the question).

Sentence: Atco Ltd . said its utilities arm is considering building new electric power plants , some valued at more than one billion Canadian dollars ( US $ 851 million ) , in Great Britain and elsewhere .<sep>Question: who are atco. ltd?
Output:
Atco Ltd