enpax 0.1.1

ENergy Platform — Automated eXpenditures

ENPAX

ENPAX (ENergy Platform — Automated eXpenditures) is an open-source Python library that provides modular, bottom-up capital and operating expenditure (CAPEX/OPEX) models for energy technologies. Cost estimates are derived using system design characteristics, site specific details, power system considerations and infrastructure assumptions.

Software Requirements

• Python 3.10+

Installing ENPAX

PyPI

pip install enpax

Source Installation

1. Using Git, navigate to a local target directory and clone the repository:

   git clone https://github.com/NatLabRockies/ENPAX.git
   

2. Navigate to ENPAX:

   cd ENPAX
   

3. Create a new virtual environment and activate it. Using Conda and naming it enpax:

   conda create --name enpax python=3.11 -y
   conda activate enpax
   

4. Install ENPAX and its dependencies:

   • To use ENPAX only:

     pip install .
     

   • To install in editable mode with development dependencies:

     pip install -e ".[develop]"
     

   • To install with example/notebook dependencies:

     pip install -e ".[examples]"
     

   • To install all optional dependencies at once:

     pip install -e ".[all]"
     

Usage

ENPAX models can be configured and run either via YAML config files or Python dictionaries. Example notebooks are provided in the examples/ directory:

• examples_using_yaml_config_files.ipynb — configure and run models using .yaml files from the configs/ directory
• examples_using_dictionaries.ipynb — configure and run models programmatically in Python

Quick Start

from enpax.runner import CentralRunner
 
runner = CentralRunner(config="configs/solar_bess.yaml")
results = runner.run()
print(results)

Available Models

The library is structured around a shared abstract base class (BaseCostModel) that enforces a consistent interface — run_capex(), run_opex(), and run_design() — across all technology models, and a central runner (CentralRunner) that assembles multi-technology systems from YAML configuration files and returns structured output objects (TechResult, SystemResult). The current release includes two fully detailed technology models as well as the ability for a user to define their own technology cost model, both applicable for CAPEX and O&M cost estimations.

Model	Description
solar_bess_2024Q1	Solar PV + BESS hybrid CAPEX/OPEX model
bess_2025	Standalone battery energy storage CAPEX/OPEX model
generic_passthrough	Generic passthrough model for custom CAPEX/OPEX inputs

Release Notes

1. Ensure all tests pass.
2. Ensure this README is up to date.
3. Ensure dependency and Python versions are current.
4. Ensure CHANGELOG.md is up to date.
5. Bump the version in pyproject.toml using semantic versioning (https://semver.org/).
6. Make a pull request into main from develop or a patch release branch.
   1. Merge main back into develop if develop was not the base branch.
7. Tag the new release and push it:

   git tag -a v0.1.1 -m "message for v0.1.1"
   git push origin v0.1.1
   

   1. This will trigger the Deploy to Test PyPI GitHub Action. If it passes, proceed to step 8. If it fails, continue below.
   2. Delete the tag locally and on remote:

      git tag -d v0.1.1
      git push --delete origin v0.1.1
      

   3. Create a new branch off main, fix the build issue, and return to step 5.
8. Create a new release at https://github.com/NatLabRockies/ENPAX/releases, ensuring that:
   1. The newly created tag is selected, and
   2. Generate release notes is selected. This will trigger the Deploy to PyPI GitHub Action.

Contributing

Contributions are welcome. Please open an issue or submit a pull request against the develop branch.

Authors

• Daniel Mulas Hernando — National Laboratory of the Rockies
• Kaitlin Brunik — National Laboratory of the Rockies
• Elenya Grant — National Laboratory of the Rockies

License

This project is licensed under the BSD 3-Clause License. See LICENSE for details.

NLR Software Record

This project's NLR Software Record is SWR-26-053