flixOpt

Python-based optimization framework designed to tackle energy and material flow problems using mixed-integer linear programming (MILP) and provides a powerful platform for both dispatch and investment optimization challenges.
https://github.com/flixopt/flixopt

Category: Energy Systems
Sub Category: Energy System Modeling Frameworks

Keywords

climate-change energy energy-system energy-system-modeling energy-systems linear-programming mathematical-modelling milp mixed-integer-linear-programming modeling optimisation optimization python renewables

Keywords from Contributors

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Last synced: about 10 hours ago
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Repository metadata

Vector based Energy Optimization Framework

• Host: GitHub
• URL: https://github.com/flixopt/flixopt
• Owner: flixOpt
• License: mit
• Created: 2022-09-23T09:58:32.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2026-03-18T09:48:00.000Z (18 days ago)
• Last Synced: 2026-03-19T00:50:50.916Z (17 days ago)
• Topics: climate-change, energy, energy-system, energy-system-modeling, energy-systems, linear-programming, mathematical-modelling, milp, mixed-integer-linear-programming, modeling, optimisation, optimization, python, renewables
• Language: Python
• Homepage: https://flixopt.github.io/flixopt/
• Size: 120 MB
• Stars: 17
• Watchers: 2
• Forks: 9
• Open Issues: 65
• Releases: 81
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • Contributing: .github/CONTRIBUTING.md
  • License: LICENSE
  • Citation: CITATION.cff
  • Roadmap: docs/roadmap.md

README.md

pip install flixopt

import flixopt as fx

# 1. Define your system structure
flow_system = fx.FlowSystem(timesteps)
flow_system.add_elements(buses, components, effects)

# 2. Optimize
flow_system.optimize(fx.solvers.HighsSolver())

# 3. Analyze results
flow_system.solution        # Raw xarray Dataset
flow_system.stats           # Convenient analysis accessor

# Basic single-period model
flow_system = fx.FlowSystem(timesteps)
boiler = fx.linear_converters.Boiler("Boiler", eta=0.9, ...)

pip install flixopt

pip install "flixopt[full]"

Citation (CITATION.cff)

cff-version: 1.2.0
message: "If you use this software, please cite it as below and consider citing the related publication."
type: software
title: "flixopt"
version: 6.1.0
date-released: 2026-03-17
url: "https://github.com/flixOpt/flixopt"
repository-code: "https://github.com/flixOpt/flixopt"
license: MIT
abstract: "FlixOpt (Flexible, Low-entry, Investment, X-sector OPTimization) is a comprehensive framework for modeling and optimizing energy and material flow systems in Python. It enables optimization of diverse applications including district heating networks, industrial production lines, renewable energy portfolios, and supply chain logistics. Built on modern scientific Python stack (linopy and xarray), it provides a progressive enhancement approach allowing users to start with simple models and incrementally add complexity such as multi-period investments, stochastic scenarios, and custom constraints. The framework simplifies the creation of global constraints and switching objectives through its 'effect' concept. The framework is designed for researchers and engineers in energy systems, industrial process optimization, and operations research."
keywords:
  - optimization
  - energy systems
  - energy flow modeling
  - linear programming
  - mixed-integer programming
  - MILP
  - operations research
  - python
  - district heating
  - renewable energy
  - multi-period optimization
  - investment optimization
  - capacity planning
  - energy modeling
  - sector coupling
  - energy transition
  - industrial processes
  - stochastic optimization
  - linopy
  - xarray
authors:
  - family-names: Bumann
    given-names: Felix
    email: felixbumann387@gmail.com
    affiliation: "SachsenEnergie AG"
    orcid: "https://orcid.org/0009-0006-0765-4789"
  - family-names: Panitz
    given-names: Felix
    email: baumbude@googlemail.com
    affiliation: "Fraunhofer Research Institution for Energy Infrastructures and Geotechnologies IEG"
    orcid: "https://orcid.org/0009-0007-7030-6987"
  - family-names: Stange
    given-names: Peter
    email: peter.stange@tu-dresden.de
    affiliation: "Chair of Building Energy Systems and Heat Supply, TU Dresden"
    orcid: "https://orcid.org/0009-0001-6407-1495"
identifiers:
  - type: doi
    value: "10.18086/eurosun.2022.04.07"
    description: "Software-supported Investment Optimization for District Heating Supply Systems"
  - type: url
    value: "https://flixopt.github.io/flixopt/latest/"
    description: "Documentation"
  - type: url
    value: "https://pypi.org/project/flixopt/"
    description: "PyPI package"
references:
  - type: conference-paper
    authors:
      - family-names: Panitz
        given-names: Felix
      - family-names: Behrends
        given-names: Tim
      - family-names: Stange
        given-names: Peter
    title: "Software-supported Investment Optimization for District Heating Supply Systems"
    year: 2022
    conference:
      name: "EuroSun 2022"
    doi: "10.18086/eurosun.2022.04.07"

GitHub Events

Total

• Release event: 32
• Delete event: 164
• Pull request event: 305
• Fork event: 3
• Issues event: 60
• Issue comment event: 289
• Push event: 1188
• Pull request review event: 254
• Pull request review comment event: 293
• Create event: 236

Last Year

• Release event: 26
• Delete event: 155
• Pull request event: 282
• Fork event: 3
• Issues event: 58
• Issue comment event: 270
• Push event: 1103
• Pull request review event: 239
• Pull request review comment event: 284
• Create event: 215

Committers metadata

Last synced: 13 days ago

Committer domains:

• tu-dresden.de: 2
• ieg.fraunhofer.de: 1

Issue and Pull Request metadata

Last synced: 15 days ago

Package metadata

• Total packages: 3
• Total downloads:
  • pypi: 848 last-month
• Total dependent packages: 0 (may contain duplicates)
• Total dependent repositories: 0 (may contain duplicates)
• Total versions: 208
• Total maintainers: 1

Score: 13.230219975255437