Sustainable Building

Carbon- and cost-aware scheduling of flexible residential and building loads, from single homes to whole cities

Buildings and homes are among the largest and most flexible electricity loads on the grid. Much of that demand, such as EV charging, heating and cooling, and water heating, can shift in time without affecting the people who use it. My research schedules these flexible loads to cut carbon and cost, and it studies what happens when that flexibility is exercised across a whole city.


Decarbonizing the Home

GreenThrift (Bovornkeeratiroj et al., 2025) is a home automation system that schedules flexible residential loads such as EVs, heating and cooling, and appliances. It uses knowledge of future carbon intensity and electricity price to reduce both carbon emissions and cost, and it limits the inconvenience of delaying a load so comfort stays intact.

GreenThrift schedules flexible home loads using forecasts of carbon intensity and price, cutting emissions and cost while keeping delays within a comfort budget.

From Homes to Cities

Household-level strategies do not simply add up across a city. Our study of city-scale decarbonization of residential heating (Mkocheko et al., 2026) shows that when many homes shift heating loads at once, shared distribution infrastructure becomes the binding constraint, especially transformer capacity, so what is optimal for one home can overload the block.

Decarbonizing residential heating across a city has to respect shared distribution limits, since transformer capacity binds once many homes electrify and shift heating at once.

References

2026

  1. BuildSys ’26
    CityScale.jpg
    City-Scale Decarbonization of Residential Heating under Transformer Constraints
    Fabian Francis Mkocheko, Walid A. Hanafy, Adam Lechowicz, and 2 more authors
    In Proceedings of the 13th ACM International Conference on Systems for Energy-Efficient Buildings, Cities, and Transportation, Oct 2026

2025

  1. JCSS
    GreenThrift.jpg
    GreenThrift: Optimizing Carbon and Cost for Flexible Residential Loads
    Phuthipong Bovornkeeratiroj, Walid A. Hanafy, David Irwin, and 1 more author
    ACM Journal on Computing and Sustainable Societies, Mar 2025
    Presented in COMPASS 2025