[oclug] Server hydro costs
flynn at clarkhall.ca
Mon Jun 9 06:36:01 EDT 2003
On Mon, Jun 09, 2003 at 02:35:32AM -0400, Ian! D. Allen wrote:
> > I did a quick guestimate and figured that my server probably cost me
> > at least $75 of that.
> "The provincial government's Bill 210, Electricity Pricing,
> Conservation and Supply Act and Business Protection Plan cap the
> price of electricity at 4.3 cents per kilowatt-hour for residential
> customers, business customers (whose consumption is 250,000
> kilowatt-hours per year or less) and "designated consumers"."
Unfortunately that 4.3 cents is only part of the bill. My bill also
includes 1.78 cents/kWh for Distribution, 0.7 cents/kWh for Debt
Retirement, 0.57 cents/kWh for Transmission Network Service, 0.5
cents/kWh for Transmission Connection Service, and 0.62 cents/kWh for
Wholesale Market Service, which brings me to 8.47 cents/kWh (plus, of
course, the standard Service Charge... but as I have a fridge running
anyway, I'm going to have to eat that one regardless).
> So, a server with a 200W power supply running steady-state at half
> capacity (?) might use 100W. 100W times 24 hours times 30 days divided
> by 1000 times 4.3 cents is $3.10/month or $37.15/year.
So, using the above (well, with a slight modification to use 365.24
days/year), it comes out costing me (with the 100W figure) about
$74.25 per year in electricity costs to power one server. Which makes
the original posters' estimate of $75 remarkably accurate (assuming he
meant per year and not per month).
> It could have been worse:
> "Hydro Ottawa said yesterday its electricity price averaged almost 9.5
> cents per kilowatt hour in the first three weeks of September. That
> was almost three times the price in May and June, when the average was
> slightly below 3.4 cents per kilowatt hour after the market was opened
> to competition."
If 9.5 cents/kWh kept up for a year (and there were no other changes
in the charges on my bill), I'd be looking at a bill of $119.82/year,
or about $10/month.
I'm curious if 100W is an adequate estimate, though. Has anyone tried
measuring the actual power use of their server boxes? I imagine it's
pretty close for the Pentium-75 I've got working as a server right
now, however I'd suspect much higher power consumption numbers for
Pentium 4's and SMP boxes with more than the 2 HD's I've got in mine.
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