Hi WB
Some thoughts on this:
Insurance may well be an issue. I suggest that you speak to existing insurers, you may find that they will cover the unoccupied property for a limited period. You may well have difficulty obtaining suitable cover in the long run.
Turn off the water, and drain everything - all pipes, tanks and water traps. Consider filling water traps (in the sinks, toilet bowl) with an antifreeze mixture to protect against freezing.
I'd leave the power on - a couple of small lamps on timers for security would be a good idea. A dehumidifier on a timer, combined with a small oil-filled radiator on a frost 'stat would also be a good idea, IMHO. Bear in mind that the ESB now charge a premium for customers with low (or no) electricity consumption, so the savings available by turning the power off completely may be smaller than you think. I'm assuming that there's no automatic central heating system installed.
Do you have someone nearby who can keep an eye on the upkeep of the outside? Overgrown grass, shrubs & hedges are a big giveaway signal that a house may be unoccupied, and that may attract unwanted visitors.