Publications

Growth in electricity storage has the potential to increase emissions from power generation. Concerns about this outcome are currently prompting many policies to address the issue. We study a particularly popular policy proposal called the “Clean Peak Standard” that incentivizes storage to discharge during periods of high electricity demand. The stated goal of the policy is to shift storage discharge to offset production from generators with high pollution emissions. We show that the policy is largely ineffective at achieving this emissions reduction goal. The policy reinforces existing incentives faced by storage operators, so it does not have a strong effect on discharging behavior. It is also unable to capture high-frequency changes in marginal operating emissions rates. Alternative policies, such as a carbon tax, are more effective at reducing the emissions increase caused by storage. Policymakers considering Clean Peak-style policies should instead consider these alternative policies.

In this paper, we use an economics-engineering simulation model to analyze how different types of residential retail tariff designs such as time-of-use, critical-peak pricing, and fully cost-reflective tariffs affect DER deployment and use, and, hence, the resulting emissions of CO2, SO2, and NOx in the Commonwealth Edison service territory in Chicago. Our results show that in the short term retail tariffs can help or hinder environmental goals through their effect on DER deployment and consumption behavior, emphasizing the importance of pairing DER policy initiatives with decarbonization efforts at the wholesale electricity level.

This paper simulates the effect of more advanced residential electricity tariffs on household adoption of distributed energy resources (DERs). We find that tariffs that are more time variant lead to greater reductions in coincident peak demands than flat volumetric tariffs, both from load shifting as well as from adoption of DERs. Regarding the effect of electricity tariff design on DER investments, we find that at current DER purchase costs investments in rooftop photovoltaic (PV), batteries and natural gas distributed generators are not privately optimal under any of our tariff design scenarios based on current cost levels for electricity and gas in the Chicago study area.

This project looks at the effects of different retail tariff designs on the deployment of distributed energy resource (DERs), and their subsequent effect on pollution, electric system costs, and customer bills. We use smart-meter data and techno-economic models to simulate the effects of more granular and cost-reflective tariff designs on DER investment and use.

This project is supported by the Alfred P. Sloan Foundation, and is a collaboration between the Institute for Policy Integrity, Environmental Defense Fund, and the MIT Energy Initiative.

Guided by the blueprint of all three Bostock opinions, this article, published in the Columbia Journal of Environmental Law, performs a deep dive into the legislative materials surrounding the enactment of the Clean Air Act of 1970, uncovering a treasure trove of sources that had not previously been part of the public discourse. It shows how, under the interpretive approach of each of the three opinions, greenhouse gases are unquestionably pollutants for the purposes of the Clean Air Act. Because the approaches in the majority and dissents in Bostock—and thus a majority of the current Court—all point in the same direction, the era of greenhouse gas exceptionalism should now be over.