What does a nas / home server (24/7) cost to run?
A typical nas / home server (24/7) left on 24/7 as most NZ households do costs about $8/month to run in New Zealand - that's $92/year at the current national average rate of 42.0c/kWh.
| Region | Rate | Monthly |
|---|---|---|
| Dunedin | 42.4c/kWh | $8 |
| Queenstown | 42.3c/kWh | $8 |
| Auckland Central | 41.2c/kWh | $8 |
| Christchurch | 38.5c/kWh | $7 |
| Wellington City | 37.0c/kWh | $7 |
This estimate models a typical nas / home server (24/7) left on 24/7 as most NZ households do. At the national average rate of 42.0c/kWh, that works out to about 18 kWh a month - $8/month, or $92 across a year.
- Power draw
- 25 W
- Typical use
- On 24 hours a day, every day
- Rate applied
- 42.0c/kWh (national average)
- Energy used
- 18 kWh/month · 219 kWh/year
Your own usage will differ - adjust the hours, wattage and rate for your household in the full calculator.
What to know about running a nas / home server (24/7)
A NAS or home server is, by design, an always-on appliance. Its whole job is to be available 24/7 for backups, media and files, so even at a low 20-30W it builds up a steady cost across the year simply from never switching off. Add spinning hard drives and the draw climbs a little. A box stuffed with disks uses more than a small flash-based unit.
The value proposition is availability, and availability means it never sleeps. Backups run overnight, media streams whenever someone hits play, and files need to be reachable the moment you ask. That is why it sits in the same always-on category as the router, drawing its 20-30W through every hour of the year rather than only when you happen to use it.
Physical disks are what nudge the number upward. A unit built around solid-state flash storage runs lean, while a chassis packed with several spinning mechanical drives has more hardware to keep alive, so a well-populated server draws more than a bare one. It is still not a large load in absolute terms, just a persistent one.
For most home setups the cost is modest and the convenience is the whole point, so this is not an appliance to agonise over. If you run a simple two-drive box for family photos and backups, the running cost is small change against the peace of mind of having your data safe and reachable.
Where it is worth a look is the bigger, multi-drive servers that enthusiasts run. A tower with six or eight drives, transcoding video and running a stack of services, is a genuine little always-on computer, and its year-round baseline is large enough to be worth trimming deliberately.
Enabling drive spin-down when idle, scheduling power-hungry tasks sensibly and choosing efficient drives all trim the year-round baseline. Letting disks park when nothing is reading them, running backups and media indexing at set times rather than constantly, and picking low-power drives each shave a bit off the total. Like the router, it is part of your home's standby floor, drawing power every hour whether anyone is using it or not, so add it to the calculator to see where your always-on load really sits.
Frequently asked
How much does a nas / home server (24/7) cost to run in NZ?
At the national average electricity rate of 42.0c/kWh, a typical nas / home server (24/7) costs about $8 per month, or $92 per year. Actual costs vary by region and how heavily you use it.
Which NZ region has the cheapest nas / home server (24/7) running cost?
Of the five centres shown on this page, Wellington City is the cheapest at $7/month, and Dunedin is the most expensive at $8/month. The 30% spread reflects regional MBIE retail rates.
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