Virtualization, Thin Clients, and Energy Consumption

In previous posts I documented a financial strategy that allows the average district to afford ubiquitous and/or one-to-one computing. This week I want to broaden the strategy to energy savings. It’s amazing what a significant savings replacing traditional ‘fat clients’ with ‘thin clients’ can be.

The University of Pennsylvania produced the energy graph below which shows the average PC drawing more than 100 watts during moderate use. This doesn’t include the monitor which on average can draw approximately 75 watts. So, for the sake of today’s post, let’s settle on 175 watts for the average energy use of a typical desktop used in our schools.

penn-u-energy-chart

Below is another chart, from the Mr. Electricity blog, showing ranges of PC energy use.

energy-use-chart

The chart below, from Steve Greenburg, President of Thin Client Solutions, shows the average energy used by several models of WYSE Thin Clients. The 3630 model uses more energy because it has a built in monitor. The other energy readings are without monitors.

thin-client-power-usage

From the same report, notice that the amount of energy consumed by Thin Clients is significantly less compared to the traditional PC.

thin-client-v-pc-graph

What kind of savings can we expect by implementing a Thin Client solution? Let’s look at a district with 1,000 computers.

Assumptions:

1. 175 watts used by each computer.

2. Each computer in moderate use 6 hours per day; 185 days per year.

3. Computers left on overnight and during the summer use approximately 35 watts.

4. The Thin Client solution uses 6 watts plus 75 watts for the monitor.

5. A utility rate of $.14 per kilowatt hour

Using these assumptions, the total amount spent on energy for our 1,000 computers is $64,680.

Now, let’s do the same calculation with the Thin Client solution

The approximate savings by implementing Thin Clients for our 1,000 computer network is $29,291 per year; a 45% savings in energy costs.

The 5 year savings = $146,455

$146,455 can be used to purchase quite a few new $450 devices.

BTW, it’s not only cost effective; but the right thing to do for our environment

pete

Note: Obviously, energy use can vary based on many equipment and usage factors. The savings shown here are illustrative only.

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