The Woodruff School

SUMMARY

Increasing adoption of renewable energy technologies like solar and wind on both utility and residential scales has given rise to increased investment in battery systems to capture energy generated by these technologies. For utilities, the main purpose is to solve the intermittency problem associated with inconsistent wind and solar resources, to ensure the public’s steady access to electricity. On a residential scale, batteries, or home energy systems (HES) serve multiple functions such as backup power and peak shaving. Additionally, when coupled with PV arrays, an HES captures surplus solar energy and saves it for when the house load exceeds solar generation. However, an HES is an extra investment in addition to PV installation. Concurrent with adoption of renewable energy and improving battery technology is the increased adoption of electric vehicles. EVs can have increased utility by using them as a HES substitutes, discharging them during peak periods and charging during the off-peak utilizing Vehicle-to-House (V2H) capabilities. Utilities benefit as well, as adoption of this practice with access to the public’s EV data allows them to spread out grid demand (V2G) and downsize the necessary investment into grid-scale battery storage. However, EV charging and discharging degrades the battery, so V2H also causes additional wear. In addition, the financial gain of V2H depends on electricity costs, household load, and the charge level preferences of the owner. The work seeks to analyze the financial benefits of V2H discharging in various regions of the United States as compared to the loss of value associated with the increased battery degradation, as represented by the additional miles placed on the battery calculated using efficiency data. Comparing the results will yield a greater understanding of the viability of V2H from the consumer perspective and inform utilities and policy makers of the need for incentives to offset any loss of value incurred from V2G. http://bit.ly/4a1WjC5 Meeting Code: 299 979 151 96 Passcode: ookA2L

SUBJECT:	Ph.D. Proposal Presentation

BY:	Steven Johnston

TIME:	Monday, December 11, 2023, 2:00 p.m.

PLACE:	MRDC 4211, http://bit.ly/4a1WjC5

TITLE:	Regional Financial Analysis of Vehicle-to-House EV Battery Back-up in the Context of Additional Miles Driven

COMMITTEE:	Dr. Berdinus Bras, Chair (ME) Dr. Michael Leamy (ME) Dr. Hailong Chen (ME) Dr. Daniel Matisoff (Public Policy) Dr. Richard Simmons (SEI)

SUMMARY Increasing adoption of renewable energy technologies like solar and wind on both utility and residential scales has given rise to increased investment in battery systems to capture energy generated by these technologies. For utilities, the main purpose is to solve the intermittency problem associated with inconsistent wind and solar resources, to ensure the public’s steady access to electricity. On a residential scale, batteries, or home energy systems (HES) serve multiple functions such as backup power and peak shaving. Additionally, when coupled with PV arrays, an HES captures surplus solar energy and saves it for when the house load exceeds solar generation. However, an HES is an extra investment in addition to PV installation. Concurrent with adoption of renewable energy and improving battery technology is the increased adoption of electric vehicles. EVs can have increased utility by using them as a HES substitutes, discharging them during peak periods and charging during the off-peak utilizing Vehicle-to-House (V2H) capabilities. Utilities benefit as well, as adoption of this practice with access to the public’s EV data allows them to spread out grid demand (V2G) and downsize the necessary investment into grid-scale battery storage. However, EV charging and discharging degrades the battery, so V2H also causes additional wear. In addition, the financial gain of V2H depends on electricity costs, household load, and the charge level preferences of the owner. The work seeks to analyze the financial benefits of V2H discharging in various regions of the United States as compared to the loss of value associated with the increased battery degradation, as represented by the additional miles placed on the battery calculated using efficiency data. Comparing the results will yield a greater understanding of the viability of V2H from the consumer perspective and inform utilities and policy makers of the need for incentives to offset any loss of value incurred from V2G. http://bit.ly/4a1WjC5 Meeting Code: 299 979 151 96 Passcode: ookA2L