 So, variation in fuel costs, right, those variations were generally allowed to be passed on directly to the consumers. Okay, so if the price of all the fuel the utility had to buy doubled, then the generation portion of your electricity bill would double, right. So the utilities were generally allowed to do that. Most regulators, most escape regulators broke up the utilities costs into investments, right. So capital investments in wires and substations and power plants and things like that, and operational costs, which were things like labor costs and fuel. And the basically the deal that the utilities had with the public utility commission was that they could pass through all of their operational costs to consumers. Okay, so fuel prices increased, electricity prices would go up, okay, but that they weren't allowed to earn any profit on fuel, that they weren't allowed to earn profit on stuff that they could build. This was called the rate base. So every time the utility built a new power plant or built a new transmission line, then it would get to earn a profit off of that investment, okay. And so anyway, so this regulation created a very stable climate for a long time, but you sort of see where we might start to have some problems, right. One, if the utilities profits went up every time it built something, right, then the utilities sort of got in this mindset where their business model was building stuff, right. Second, you know, when you're spending other people's money, then you're maybe not necessarily as careful with it as you might be in other lives, okay. And so, but you know, for these sort of what economists on incentive problems existed for a long time, but they really didn't manifest themselves until the 1970s when we basically had two things happen at the same time. One, we had the sort of energy prices of the 1970s and fuel prices increased dramatically. At the time, 20% of U.S. electricity was generated with oil, right, and so when oil prices went up dramatically, that impacted the cost of generating electricity. The second thing that happened was for environmental and other reasons, the utilities, well, utilities in many states kind of halfway were forced and halfway decided to make large investments in nuclear power plants. And as it turned out, the utilities did not know how to build or operate nuclear power plants terribly well, right, and so there were all sorts of delays and cost overruns and cost escalations with nuclear power plants, and you know, because of this deal that the utilities have with their regulators, all of, I mean, all or most of those costs ultimately had to be paid by utilities' customers, okay.