[recipe] Energy reduction / static management / dynamic management
Stuart Cheshire <cheshire@apple.com> Thu, 26 March 2009 07:48 UTC
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From: Stuart Cheshire <cheshire@apple.com>
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Date: Thu, 26 Mar 2009 00:49:29 -0700
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Subject: [recipe] Energy reduction / static management / dynamic management
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Some quick thoughts after tonight's dinner: Here are three (certainly not the only three) broad themes we might want to think about. 1. Simple reduction of absolute energy usage. There are two aspects to this, measurement and control. 1a. Measurement -- allowing people to determine where energy is going in their homes. This alone is an important part of enabling people to save energy, by knowing where they're using energy. The first step to replacing your refrigerator with a more efficient one is discovering that your current refrigerator is using too much energy. I'd like to see a world where every power outlet or light switch includes a power meter, which can be interrogated over the network to find out how much power is being drawn from it at any moment. 1b. Control. For example, using less energy by automatically turning off lights in unoccupied rooms. Here the theme is not more efficient devices, but less use of the devices you have. 2. Time-sensitive use of energy. When the electricity company charges more for peak-time usage, signaling refrigerator compressors, air conditioning, hot tub heating, electric car charging, and similar high- load devices to try to limit their consumption during peak time can reduce the peak load on the electricity grid, and reduce the customer's electricity bill, even though the total energy consumption may be the same. The difference here is that you're not trying to reduce your hot tub heater's total energy consumption, you're trying to control *when* it consumes that energy. 3. Dynamic adaptation to current spot pricing. This is an extension of (2). Whereas in (2) the peak and off-peak hours for each day of the week are published well in advance, with spot pricing the instantaneous price of one kWh is not published in advance, but instead is announced in an hour-by-hour or even minute-by-minute basis, according to current demand. The difference between this and case (2) is that case (2) can be handled entirely within the home, by simply entering the peak/off-peak hours manually into some controller, but case (3) would require active communication with the electricity company to determine the current price, which is a larger challenge. Stuart Cheshire <cheshire@apple.com> * Wizard Without Portfolio, Apple Inc. * Internet Architecture Board * www.stuartcheshire.org
- [recipe] Energy reduction / static management / d… Stuart Cheshire
- Re: [recipe] Energy reduction / static management… Chris Lonvick