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Newsbrief from Environmental Building News
November 1, 2009
CBRE Experiments With One-Day Energy Reductions
On September 23, 2009, development company CB Richard Ellis Group (CBRE) joined with Brookfield Properties and ING Clarion Partners in a one-day pursuit of energy savings through building management across its portfolio. The company reports that the effort resulted in 9.2% overall energy savings across 43 million square feet (4 million m2), prevented 138 tons of carbon emissions, and saved more than $26,500 in energy costs. CBRE worked with its tenants and building managers to implement energy-saving strategies not only at the building level but also with individual occupants.
DISCUSSIONSReader-contributed comments related to CBRE Experiments With One-Day Energy Reductions - EBN: 18:11. Comments are listed with newest at the top.
Person-hour cost and savings per period?
Posted by
Ethan Goldman
on Nov 10, 2009, 09:26 AM
It's impressive that they were able to coordinate and move that fast (though I would be shocked if all the fixes were in place within 24 hrs.) but it's not clear how much effort it actually took to reveal $26,500 in savings.
Since their total cost of energy was only a few dollars per thousand-sq-ft during that period (assuming a relatively uniform cost per unit energy) it might have also been a much greater accomplishment - did they only count the value of savings during that one, Herculean day?
Of course, now I'm just guessing. Do you know how many person-hours were in the one-day pursuit? And do you know over what period (daily, annual, depreciated lifetime, etc.) the savings were calculated?
It's impressive that they were able to coordinate and move that fast (though I would be shocked if all the fixes were in place within 24 hrs.) but it's not clear how much effort it actually took to reveal $26,500 in savings.
Since their total cost of energy was only a few dollars per thousand-sq-ft during that period (assuming a relatively uniform cost per unit energy) it might have also been a much greater accomplishment - did they only count the value of savings during that one, Herculean day?
Of course, now I'm just guessing. Do you know how many person-hours were in the one-day pursuit? And do you know over what period (daily, annual, depreciated lifetime, etc.) the savings were calculated?
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Allyson Wendt
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Ethan, I just looked back at their press release, and those savings figures are for the single day (it isn't clear whether they take man-hours of preparation into account). According to CBRE, this would total $6.9 million in savings annually (36,000 tons of carbon).It looks like pretty simple stuff--turning back the thermostats by a degree, reducing fan speeds, and turning off lights. They also trained occupants, I believe.
It's not clear how they calculated the savings--whether this was taken from energy-monitoring equipment or modeled based on average usage data.