Yes, POWERS is a Scrabble word!

Letter values in Scrabble US: P 3, O 1, W 4, E 1, R 1, S 1.

Is it a valid word?

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

possession of controlling influence
(physics) the rate of doing work; measured in watts (= joules/second)
possession of the qualities (especially mental qualities) required to do something or get something done
(of a government or government official) holding an office means being in power
one possessing or exercising power or influence or authority
a mathematical notation indicating the number of times a quantity is multiplied by itself
physical strength
a state powerful enough to influence events throughout the world
a very wealthy or powerful businessman

Also: world power, major power, great power, big businessman, business leader, top executive.

Not playable in Scrabble US: POWERFULNESS.