A negawatt is a watt of power that wasn't consumed. It's a powerful (sorry) concept, and could be a great way to motivate consumers to reduce household energy usage.
The bane of a utility's existence is unanticipated demand - either negative or positive. The former means that they purchased power that was unconsumed. The latter is worse. If the demand for energy exceeds supply, then to meet demand and avoid brownouts or blackouts, the utility desperately needs to buy energy on the spot market, often at a premium, and of course the cost is passed on to the consumer.
Therefore the perfect world for a utility is steady, highly predictable energy usage curve. That gives them ample time to know what they need, when they need it, and then make sure that their buyers or suppliers are able to procure at the best-possible price.
But freak weather conditions, systemic failures (downed power lines, damaged equipment like transformers, etc.), human failures (mistakes, bad decision-making, etc.) can cause unanticipated outages, and require dramatic and expensive steps.
There are wholesale markets where a utility can sell excess energy or buy emergency energy. Assuming you bought your energy at reasonable wholesale prices, it seems likely that you stand to earn a pretty solid return on investment by selling it to a "needy" buyer.
How does this relate to negawatts? This is the cool part. Imagine if you were able to instrument your home so that all power consumption (small and large appliances, heating/cooling, lights, computers, etc.) was managed via a simple browser-based application that you could access from anywhere (think of a schematic of your home and you can turn things on/off, schedule activities, laundry, dishwasher, lights to vacation mode, etc.).
Now imagine if your electricity provider comes to your neighborhood or apartment building and makes you this offer: if all of you wire up your homes (per the paragraph above) at a cost of say $2-300 per house (not horrible), we'll periodically contact you and ask you to lower your energy consumption for a number of hours. And if you as a community are able to do this, and hit the "number" we need, we'll sell the energy you save (negawatts) on the spot market, and share the profits with you.
Ideally, it would be possible to recover the $2-300 initial cost in a matter of months. And now all the future savings are upside. And because you can more closely monitor your usage, connect to your home via the Internet (even with your phone) to make adjustments, or even just to adjust your thermostat to optimize energy usage, you can really make a difference. The utility could also set the "rebate" model so that the bigger the community that participates, the more you get back from them. This creates a dynamic where all the neighbors are interested in each others consumption and maybe even "helping" to make sure everyone toes the line. Community guilt as it were:-).
The utility company will love this because they can use this motivation to flatten the curve of their overall energy usage; better instrumentation allows them to more accurately predict consumption; and finally, getting the community behind them and participating actively, results in everyone working together to lower our overall energy footprint.
Negawatts - we should all convince our utility companies to do this - it could be a really great way to effective, grassroots energy conservation.
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