Yes, AUTOMATION is a Scrabble word!

Letter values in Scrabble US: A 1, U 1, T 1, O 1, M 3, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

AUTOMATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the act of implementing the control of equipment with advanced technology; usually involving electronic hardware
the condition of being automatically operated or controlled
equipment used to achieve automatic control or operation

Not playable in Scrabble US: MECHANISATION.