ComStock Reference Documentation: Version 1

Research output: NRELTechnical Report


The commercial building sector stock model, or ComStock, is a highly granular, bottom-up model that uses multiple data sources, statistical sampling methods, and advanced building energy simulations to estimate the annual sub-hourly energy consumption of the commercial building stock across the United States. ComStock asks and answers two questions: how is energy used in the U.S. building stock and what are the impact of energy saving technologies. Specifically, ComStock identifies where energy is being consumed geographically, in what building types and end uses, and at what times of day. Simultaneously, it identifies the impact of efficiency measures: how much energy do efficiency measures save; where, or in what use cases do measures save energy; when, or at what time of day do savings occur; and which building stock segments have the biggest savings potential. This document contains the methodology and assumptions behind ComStock and serves as a guide to its use.
Original languageAmerican English
Number of pages199
StatePublished - 2023

NREL Publication Number

  • NREL/TP-5500-83819


  • analysis tool
  • building energy modeling
  • building stock
  • commercial building
  • comstock
  • stock model


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