Turning monitor off (manually or on timeout)

I run either debian or newly installed rhel in server mode (multi-user.target). In both, the monitor keeps turning itself ON for no apparent reason. In deb I use a utility 'vbetool' to turn monitor off remotely, but the said tools is not available in rhel afaik.
Is there an alternative in rhel, or any of its power management system that I can use to achieve that goal?
TIA.