PC Power Save

Powersave application to idle computers. They have a rebates page that says some utilities rebate some/all of the cost of $14.40/year.
Claimed electric bill savings of $25 - $50/year per computer.

Intelligent Configuration Settings
# Definitions can be based on CPU, disk, keyboard, mouse and application activity
# Shutdown without the loss of user productivity

Flexible Scheduling
# Options to turn off the monitor, and standby, hibernate or shutdown the computer
# Schedule Wake-on-LAN, shutdown, or restart events
# Schedule Power Save configuration updates for a single, daily, weekly, or monthly occurrence
# Schedule a temporary window where Power Save will not enforce energy management policies

Compatibility Options
# Customize the deployment as well as update and control the client workstations
# Recognizes and accommodates to Deep Freeze maintenance schedules
# Localized in English, French, German, Spanish and Japanese

Customized Inactivity Definitions
# Employ energy saving actions when CPU or disk activity falls below a defined level
# Prevent the workstation from employing power saving actions when a particular application is running

Enterprise Control
# Faronics Core Console provides unified workstation management capabilities
# Workstation grouping makes managing large deployments easy
# Disable and override a workstation’s operating system energy management settings

Savings Reports
# Generate enterprise power consumption and savings reports through Faronics Core Console
# Detailed workstation utilization reporting allows you to see how much power you are saving based upon your regional electricity cost
# Audit mode provides a baseline measure of the energy being consumed, making it easy to determine the true value of the savings generated when Power Save's features are enabled

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http://weblog.infoworld.com/sustainableit/archives/2008/09/pc_power_manage.html
I spoke with the CEO of Autonomic Software, Tony Gigliotti, today. His company offers its ANSA suites, which uses an intelligent agent for such tasks as vulnerability management, asset management, and, in line with the subject at hand, PC power management. He told me that Autonomic's Software costs around $33 per license for the first year, then $10 per license per year after that. (Notably, Autonomic isn't the only player in this space; BigFix, Verdiem Surveyor, KACE KBOX, and 1E NightWatchmanoffers offer competing solutions.)

The deal can becomes even sweeter if you happen to be served by a utility that offers rebates for purchasing PC power management licenses. PG&E, which serves Northern California, is one such utility. It offers a $15 rebate for each PC power management software license your purchase, according to Gigliotti.

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PowerOut
http://www.visionsoft.com/product.asp?prod=PO

Normal Price £90
Volume Purchase Discount £36
Total Price £54

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http://www.ecogeek.org/component/content/article/2852
An occupancy sensor via a webcam.

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2010 March/April
Review of software applications to idle/sleep/shut down PCs. Software Equals Savings