Hollywood has an insatiable capacity for churning out movies about vampires. But here’s one angle they haven’t tackled yet: the “vampires” in our everyday appliances that suck power around the clock, even when turned off.
“Energy vampires” include the always-on remote switches and other sensors that offer convenience of not walking up to the device to push a button. They also include the many clocks that ride along with microwave ovens, radios, and other appliances in our homes.
Power strips are getting smarter as some now come with timers or occupancy sensors.
The energy efficiency experts at Lawrence Berkeley National Laboratory say such standby power draw can amount to between 5 and 10 percent of a typical households electricity use and account for 1 percent of global CO2 emissions.
But a recent household study in the United Kingdom concluded that “Domestic background standby consumption is much higher than previously estimated … We see that total standby consumption can amount to nine to 16 per cent of domestic power demand.”
California has taken the lead in new appliance standards that drive a silver stake into some of the vampires that suck our money and energy. But for older appliances there’s a cheap and simple alternative: the power strip. Not even vampires can overcome a turned-off power strip.
No one seems to know who invented the power strip, or when. But this invention, selling for as little as a few dollars, can save mighty amounts of energy with the flick of a switch. It can also save you money, as long as you don’t buy the $3,500 model with “quantum resonance” technology.
At home, a simple on-off strip is usually all you need. But at work, where responsibility for office equipment may be widely shared, more advanced power strips can automatically cut power to task lights, fans, heaters, computer accessories and other “plug loads” when no one is around or working.
As a recent PG&E newsletter explains, there are three main types of advanced power strips that work well in the office:
– Timer-equipped strips work well if your office keeps regular hours. These are reliable and easy to understand. A recent study by the U.S. Department of Energy found that a scheduled timer achieved energy savings of nearly 50 percent.
– Occupancy-sensing strips shut off devices after-hours by detecting when no users are present. They also help save energy during business hours when people are away from their workstations.
– Current-sensing strips have one master control outlet, up to six switched outlets, plus a few always-on outlets. When equipment such as computer workstations go into sleep mode, they trigger the smart outlet to shut down power to the switched outlets, turning off printers, monitors and lights.
A study by the General Services Administration, the federal government’s main landlord, found that advanced power strips reduced plug loads at workstations by a quarter, and in kitchens and printer rooms by nearly half. The payback period from energy savings was only about a year.
Such advanced power strips are surprisingly affordable – as little as $20 for a timed strip, a few dollars more for a current-sensing switch, and less than $100 for an occupant-sensing strip.
PG&E offers business customers a $15 rebate on occupancy-sensing switches to speed the payback period.
Find out more on PG&E’s “Ways to Save” page on power strips, https://pge.opower.com/ei/app/tip/tip059_use_power_strips .
Jonathan Marshall works for Pacific Gas and Electric Co.