Have you looked at your power bill — like,
really looked at it? If you’re anything like Rob, you pay whatever number appears at the bottom every month and drop it in the recycling. But how everyone’s power bill is calculated — in wonk terms, the “electricity rate design” — turns out to be surprisingly important and could be a big driver of decarbonization.
On this week’s episode of Shift Key, Rob and Jesse talk about why power bills matter, how Jesse would design electricity rates if he was king of the world, and how to fix rooftop solar in America. This is the finale of our recent series of episodes on rooftop solar and rate design. If you’d like to catch up, you can listen to our previous episodes featuring Sunrun CEO
Mary Powell, the University of California, Berkeley’s Severin Borenstein, and Heatmap’s own Emily Pontecorvo.
Shift Key is hosted by Robinson Meyer, the founding executive editor of Heatmap, and Jesse Jenkins, a professor of energy systems engineering at Princeton University.
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Here is an excerpt from our conversation:
Robinson Meyer: There’s other issues we could talk about electricity rate design, and I want to come back to them in a second. But let’s say you were made Grand Vizier of all public utility commissions across the country. How would you fix this? Like, what do we need to do?
Jesse Jenkins: I think there’s basically two options that we have, here — and this is, you know, a reflection of the fact that there is no one unified electricity market structure in the U.S. We have a bunch of different ways that we do things. And so I’ll just sketch two kind of classic examples of that. There are lots of little gradations in between.
One is a kind of traditional regulated market where you get your power from a regulated or publicly owned utility, like a municipal utility, or a rural utility district, or an investor-owned utility. It’s regulated by the state, and you buy power at whatever the regulated rate is. And so, if that’s the case, we need to get those rates right. And by that I mean: There are multiple things you’re paying for when you’re paying for your bill. You’re paying for the actual energy you’re consuming, and that is a kind of volumetric thing — you know, you should pay more the more you consume, all else equal.
But the interesting feature of electricity pricing is that it varies from hour to hour because of the fact that demand is changing all the time and renewable energy availability is changing all the time. And so the actual marginal cost of generating electricity depends on this intersection of how much you demand and what the available supply is. And if you have a lot of cheap renewables, for example, flooding the grid, that price could be very low. It could even be zero — when you’re curtailing solar or wind, you have excess free power, effectively. And at other times it can be very expensive when you’re running diesel generators or inefficient gas turbines to meet this sort of peak demand requirements. Electricity prices could be several hundred dollars a megawatt-hour.
And so we have a very wide range of pricing and we don’t communicate that at all to people today. And I think we have to restore that, in some way — to let people understand that if you consume more energy during the middle of the day when there’s lots of solar available, even if you don’t have solar on your roof, it’s coming from your neighbor or utility-scale solar farm far away, that’s the cheapest, best time to consume electricity. And if you’re consuming when fossil power plants are producing expensive power, you should think about how to reduce that consumption. So it’s really important that we get that kind of time dynamic rate right for the energy component.
Robinson Meyer: So you would expose people to prices. I mean, that’s kind of your basic answer is that you would expose people to these time-of-day prices even if — and I just want to be clear, here. You’re talking about folks who live in Washington, D.C., who live in New York, who live in Philadelphia, who live in San Francisco, who live in Atlanta …
Jesse Jenkins: All over. Yeah, everywhere.
This episode of Shift Key is sponsored by…
Watershed’s climate data engine helps companies measure and reduce their emissions, turning the data they already have into an audit-ready carbon footprint backed by the latest climate science. Get the sustainability data you need in weeks, not months. Learn more at watershed.com.
As a global leader in PV and ESS solutions, Sungrow invests heavily in research and development, constantly pushing the boundaries of solar and battery inverter technology. Discover why Sungrow is the essential component of the clean energy transition by visiting sungrowpower.com.
Music for Shift Key is by Adam Kromelow.
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