COFACTOR-Residential Dataset 1

COFACTOR-Residential Dataset 1 is a dataset from the COFACTOR project containg hourly time series energy use measurements (sub-metered) and weather data from apartment buildings in Oslo and Bærum, Norway.

This dataset contains hourly sub-metered energy use data from 8 different housing associations in the Oslo area, in total 43 apartment blocks and 2330 apartments collected in the COFACTOR project. The dataset consist of 29 csv-files, one per heating central, meaning that some files contain energy data from only one apartment block, while others contain energy use information from several buildings which are collected together. The CSV-files in the dataset contains meta data about the buildings/heating centrals and hourly time series data of energy use and weather data from the buildings.The energy use data varies between the files, but generally consists of weather data, energy use data from main meters (electricity and district heating) and energy use data from sub-meters (eg. heating).

Data Summary
- Number of files: 29 csv files in a zip-folder + README
- Time series resolution: Hourly
- Time series duration: 2019-2022/2023

Data sources:
Hourly electricity measurements were collected for all available meters, including common areas and individual apartments, from the local distribution system operator (DSO). For privacy reasons, individual apartment electricity measurements are aggregated to total electricity for all apartments served by one heating central. The common electricity meters are labelled based on communication with the building owners and manual interpretation of the data. For the buildings with district heating (DH) measurement data has been collected from the local district heating company.

Files and Structure
The README-file explains all codes and structure of the CSV-files.
Each CSV file in the zip-folder consists of:
1. Metadata Section
- General building details including ID, construction year, floor area, number of buildings and number of units.
- Heating system details
2. Time Series Data Section
- Timestamp format: %Y-%m-%dT%H:%M:%S%z (local normal time: CET, UTC+01:00)
- Weather columns: outdoor temperature, wind speed, wind direction and global solar radiation
- Energy columns: Main or sub-meters [Wh/h]

Citation
If you use this dataset, please cite:
Åse Lekang Sørensen, Synne Krekling Lien, Harald Taxt Walnum,
COFACTOR-residential: Hourly electricity and heating data from residential buildings in Norway. Data in Brief, Volume 65, 2026, 112580, ISSN 2352-3409, https://doi.org/10.1016/j.dib.2026.112580.

Data descriptor: https://doi.org/10.1016/j.dib.2026.112580

Contacts
For questions about the dataset, contact:
Synne Krekling Lien (SINTEF Community)
Email: [e-mail]
Harald Taxt Walnum (SINTEF Community)
Email:[e-mail]

Acknowledgements
Dataset 1 is published with permission and help from Dråpe Entreprenør AS, Elvia (DSO), and Sikom Connect AS and we greatly acknowledge them for sharing the access to the data. The dataset is provided by the projects “Coincidence factors and peak loads of buildings in the Norwegian low carbon society” (COFACTOR) funded by Research Council of Norway and partners through grant number 326891. The authors gratefully acknowledge the support from the Research Council of Norway and research partners.