• Posts
  • RSS
  • ◂◂RSS
  • Contact

  • Balancing the Grid with Bitcoin

    September 29th, 2014
    bitcoin, ideas, power  [html]
    One of the least efficient aspects of the power grid is that it must supply exactly the amount of power demanded. If someone turns on their AC the grid needs to immediately increase the power supplied, and when they turn it off again the power supplied needs to decrease just as promptly. While a single AC unit is small enough that it's well within the margin of error, lots of AC units going on at the same time is enough that you need to fire additional plants. There's a lot we can do with prediction—if tomorrow is going to be really hot there's probably going to be a lot of power demanded because of increased AC usage—but there are also fluctuations you can't predict. How do we handle these?

    The traditional solution is to have a range of plants: cheap inflexible ones through expensive flexible ones. You use the cheap plants for your "base load," the amount of electricity that is always needed, and then as you need more and more you turn up the more flexible plants, ready to turn them off again when they're not needed. Not only are these "peak load" plants more expensive, they also tend to be less efficient: could we stop running them?

    With the current setup we definitely need them. Power consumption is variable, and these flexible plants form an essential role matching supply to demand. But what if we matched demand to supply? This is an idea people have been playing with for years in various forms. We already have it in some ways: some industrial users have agreements with their power company where certain circuits can be shut off at times of high demand. And there are ideas for more: maybe we let the price of electricity vary based on marginal cost and let your appliances see prices and decide when to run? Maybe the batteries of plug-in electrics can store power at low-demand times and release it at peak times? All of these require the cooperation of multiple parties, however, so a power company can't just apply them on their own. And that's where bitcoin could come in.

    In this case we can think of bitcoin mining as a resistor that makes money. Lots of little ASICs run SHA-256 searching for hashes that are small enough, and if you're the first to find one you get some bitcoins which you can then sell. So you still run your base load plants and your load-following plants, but you run them at a higher level, a little above what you think the most power demanded will be. Then instead of using flexible plants to increase supply when it's most needed you decrease your bitcoin mining.

    Because power companies are very conservative and bitcoin is new and volatile, you probably start off doing this as a startup that offers a service to power companies: "tell us exactly how much power to consume and we'll do that, but don't charge us much for the power". Because the main cost in bitcoin mining is the electricity, with lower power costs you should be able to produce bitcoins competitively.

    (Why not run more traditional batch computing jobs? The main advantage of bitcoin for this purpose is that the startup/shutdown cost is extremely small. The main electricity consumer is hashing hardware, and this can be designed to immediately start hashing once it has power. Most batch jobs need to boot up, load stuff into memory, do some work, save their results. This makes them much less flexible. Also I think electricity may not be the main cost in this case, though I'm less sure.)

    Comment via: google plus, facebook

    Recent posts on blogs I like:

    Governance in Rich Liberal American Cities

    Matt Yglesias has a blog post called Make Blue America Great Again, about governance in rich liberal states like New York and California. He talks about various good government issues, and he pays a lot of attention specifically to TransitMatters and our …

    via Pedestrian Observations November 19, 2020

    Collections: Why Military History?

    This week, I want to talk about the discipline of military history: what it is, why it is important and how I see my own place within it. This is going to be a bit of an unusual collections post as it is less about the past itself and more about how we st…

    via A Collection of Unmitigated Pedantry November 13, 2020

    Misalignment and misuse: whose values are manifest?

    Crossposted from world spirit sock puppet. AI related disasters are often categorized as involving misaligned AI, or misuse, or accident. Where: misuse means the bad outcomes were wanted by the people involved, misalignment means the bad outcomes were wan…

    via Meteuphoric November 13, 2020

    more     (via openring)


  • Posts
  • RSS
  • ◂◂RSS
  • Contact