I'd suggest you get a Uninterruptible Power Supply (UPS) to protect the server on power cut. When you get a system like a Merlin Gerin (MGE)UPS or other with I-O card (they call that "U-Talk"), the computer will notice the power cut and could take any possible action within the time left (depending on number of accu packs somewhere between 5 upto 20 min.)
Btw, some servers such as COMPAQ Prosignia and ProLiant do support messaging to a pager / skyper or making a call through installed modems or other connections on system errors, but there also is power cut truely the problem.
Update: you might follow the link to an APC UPS which might suffice for your needs.
Have a nice day
All decision is left to your taste