Rebate programs for green-tech projects don't end with PC power management and server virtualization. You might be pleasantly surprised to discover other opportunities to reap rebates for energy-saving endeavors in your office or datacenter. For example, utilities such as PG&E offer incentives for adopting energy-efficient storage technologies such as MAID and thin provisioning. Through the Efficiency Vermont Incentive Program, "customers may receive incentives or rebates for studies or assessments that result in operational energy savings," according to IBM [PDF]. The report also notes, "A datacenter thermal assessment that results in reduced cooling costs through air flow and delivery optimization could be eligible for an incentive or rebate of some or all of the study cost."
The best advice I can give in regard to green-tech rebate programs is this: Before you do anything that will reduce your company's energy consumption, speak to your utility. You may need to invest some extra time talking on the phone, taking measurements, reading the fine print, and filling out paperwork. But surely that's worth the prospect of reporting to the CEO how you snagged thousands -- if not tens of thousands, or even hundreds of thousands -- of dollars in free money.
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Rebates for using energy-efficient storage on the way
Wikibon Energy Labs lets storage vendors verify the energy savings of certain products, making them eligible for utility rebates from PG&E