Yes, TELECONFERENCE is a Scrabble word!

Letter values in Scrabble US: T 1, E 1, L 1, E 1, C 3, O 1, N 1, F 4, E 1, R 1, E 1, N 1, C 3, E 1.

Is it a valid word?

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

a conference of people who are in different locations that is made possible by the use of such telecommunications equipment as closed-circuit television

Also: teleconferencing.