Give more detail on your desktop specs so more guru here can help you.
Good PSU can warrant longer HDD lifespan but sometimes it's just luck I guess
SSD however may also suffer for the same, possibly even worst when it comes to blackout/electric shock situation.
Buy good PSU, protected by a good UPS and your system may last longer than you possibly imagine.

p/s: Just like buying insurance for your home, car, and yourself, PC needs insurance as well.

PSU looks good, but I'm still not so sure about the input power source, home's electricity does play another role.
How old is your PSU?
Yes, you may writes zeroes to the HDD in case you need to protect your P&C stuff.
You may also check the SMART (HDDScan) after write zeroes to check for any "...sector" attribute value.
"Reallocated sector count", "Pending sector count", etc. These are few attribute that you need to have a lookout for, otherwise you can post your SMART result here and we all can have a look.