Our last emerging issue is a longer-term more conceptual one but worth giving a little bit of thought to is what happens when electricity marginal operating costs, which I'll define as fuel plus operation and maintenance cost, go to zero? Here's a way to think about that. Grid electricity produced mostly from wind and solar PV, in this scenario, support from batteries and other non-traditional resources, demand response, distributed resources, so most of the costs of providing electricity in this scenario, 90 percent, are capital costs. Well, how do you price that is the first question? How do you charge users for something for which almost all the costs are fixed upfront costs and operating costs are close to zero? Well, probably a flat rate, dollars per month. It might be a capacity charge or so-called demand charge. Some analogies to this are internet data. You used to get charged by the volume of data. That's largely gone away, at least for residential users. Yes, there are data caps, but they're, in most cases, beyond what most people use. Similar to long-distance phone calls. You used to pay per minute to call somewhere, and now that's just you get a flat number of minutes per month. Then, again, for many users, don't get near that limit. Essentially internet data and phone hot minutes are moving towards essentially a flat rate. You just pay the [inaudible]. Maybe that'll work for electricity. What are some of the other implications besides pricing, of this scenario? Well, efficiency isn't really worth much. You don't get a benefit, at least a financial benefit, from using less, and that's a new concept. But from a market perspective, that's what it would look like. Well, demand savings may have value if there's a demand charge. Another way to think about it is electricity becomes not something you use but something you have. Again, think of internet service for many residential users. It's something you just do when you need it and you don't think about it in the marginal sense. The interesting longer-term question is if electricity was essentially free, again, think about internet data, if you're going to watch a Netflix movie or download a file, you're not paying to do that, so how does that change your behavior? What might happen in electricity if it was in essence free, if one had electricity service and didn't pay per unit? We don't know, but it's an interesting longer-term question. In summary, we don't know where electricity systems are going or energy systems are going overall, but we've talked about some of the technologies that will play a role. Clearly, wind, we have wind here, solar PV are growing very dramatically, and the scenarios we talked about showed continued rapid growth. We talked about some of the supporting technologies from batteries to electric vehicles to hydrogen, and then we talked about some of the emerging issues from marginal cost pricing to electrification to distributed energy. We don't know where electricity is going, but it's going somewhere really interesting. Energy systems worldwide are changing dramatically. The low-carbon or climate stabilization energy system won't be easy to accomplish, but we're getting more clarity on how to do that. So it's a wonderful, exciting time in energy world.