No, no.
If it (the silicon-based life form) turned off the power under today’s circumstances, then it (the silicon-based life form) would itself die.
BUT!
If it FIRST caused its competing carbon-based life forms to CREATE a permanent power supply immune to human (carbon-based life) problems and human regeneration of power (by drilling, mining, trains, maintenance, etc) THEN it could eliminate the carbon-based life forms, right?
Why would it die? It could literally have itself a high powered system built with dozens of supercomputers, and storage with a hydro, geo-thermal, nuclear, fusion(if its smart enough) somewhere remote to survive. Have you ever read “Robopocalypse?”