..
SPDX-FileCopyrightText: 2019-2021 The PyPSA-Eur Authors
SPDX-License-Identifier: CC-BY-4.0
##########################################
Release Notes
##########################################
Upcoming Release
================
* Add an efficiency factor of 88.55% to offshore wind capacity factors
as a proxy for wake losses. More rigorous modelling is `planned <https://github.com/PyPSA/pypsa-eur/issues/153>`_
[`#277 <https://github.com/PyPSA/pypsa-eur/pull/277>`_].
* The default deployment density of AC- and DC-connected offshore wind capacity is reduced from 3 MW/sqkm
to a more conservative estimate of 2 MW/sqkm [`#280 <https://github.com/PyPSA/pypsa-eur/pull/280>`_].
* Following discussion in `#285 <https://github.com/PyPSA/pypsa-eur/issues/285>`_ we have disabled the
correction factor for solar PV capacity factors by default while satellite data is used.
A correction factor of 0.854337 is recommended if reanalysis data like ERA5 is used.
* Resource definitions for memory usage now follow `Snakemake standard resource definition <https://snakemake.readthedocs.io/en/stable/snakefiles/rules.html#standard-resources>`_ ``mem_mb`` rather than ``mem``.
* Network building is made deterministic by supplying a fixed random state to network clustering routines.
* New network topology extracted from the ENTSO-E interactive map.
* The unused argument ``simple_hvdc_costs`` in :mod:`add_electricity` was removed.
* Iterative solving with impedance updates is skipped if there are no expandable lines.
* Switch from Germany to Belgium for continuous integration and tutorial to save resources.
* Use updated SARAH-2 and ERA5 cutouts with slightly wider scope to east and additional variables.
* Added existing renewable capacities for all countries based on IRENA statistics (IRENASTAT) using new ``powerplantmatching`` version:
* The corresponding ``config`` entries changed, cf. ``config.default.yaml``:
* old: ``estimate_renewable_capacities_from_capacity_stats``
* new: ``estimate_renewable_capacities``
* The estimation is endabled by setting the subkey ``enable`` to ``True``.
* Configuration of reference year for capacities can be configured (default: ``2020``)
* The list of renewables provided by the OPSD database can be used as a basis, using the tag ``from_opsd: True``. This adds the renewables from the database and fills up the missing capacities with the heuristic distribution.
* Uniform expansion limit of renewable build-up based on existing capacities can be configured using ``expansion_limit`` option
(default: ``false``; limited to determined renewable potentials)
* Distribution of country-level capacities proportional to maximum annual energy yield for each bus region
* The config key ``renewable_capacities_from_OPSD`` is deprecated and was moved under the section, ``estimate_renewable_capacities``. To enable it, set ``from_opsd`` to `True`.
* Add operational reserve margin constraint analogous to `GenX implementation <https://genxproject.github.io/GenX/dev/core/#Reserves>`_.
Can be activated with config setting ``electricity: operational_reserve:``.
* Add function to add global constraint on use of gas in :mod:`prepare_network`. This can be activated by including the keyword ``CH4L`` in the ``{opts}`` wildcard which enforces the limit set in ``electricity: gaslimit:`` given in MWh thermal. Alternatively, it is possible to append a number in the `{opts}` wildcard, e.g. `CH4L200` which limits the gas use to 200 TWh thermal.
* A new section ``conventional`` was added to the config file. This section contains configurations for conventional carriers.
* Add configuration option to implement arbitrary generator attributes for conventional generation technologies.
* Implement country-specific Energy Availability Factors (EAFs) for nuclear power plants based on IAEA 2018-2020 reported country averages. These are specified ``data/nuclear_p_max_pu.csv`` and translate to static ``p_max_pu`` values.
* The powerplants that have been shut down before 2021 are filtered out.
* ``powerplantmatching>=0.5.1`` is now required for ``IRENASTATS``.
* The inclusion of renewable carriers is now specified in the config entry ``renewable_carriers``. Before this was done by commenting/uncommenting sub-sections in the `renewable` config section.
* Now, all carriers that should be extendable have to be listed in the config entry ``extendable_carriers``. Before, renewable carriers were always set to be extendable. For backwards compatibility, the workflow is still looking at the listed carriers under the ``renewable`` key. In the future, all of them have to be listed under ``extendable_carriers``.
* It is now possible to set conventional power plants as extendable by adding them to the list of extendable ``Generator`` carriers in the config.
* Listing conventional carriers in ``extendable_carriers`` but not in ``conventional_carriers``, sets the corresponding conventional power plants as extendable without a lower capacity bound of today's capacities.
* Now, conventional carriers have an assigned capital cost by default.
* The ``build_year`` and ``lifetime`` column are now defined for conventional power plants.
* Fix crs bug. Change crs 4236 to 4326.
* Update rasterio version to correctly calculate exclusion raster
* Remove rules to build or retrieve rasterized NATURA 2000 dataset. Renewable potential calculation now directly uses the shapefiles.
* Cache data and cutouts folders. This cache will be updated weekly.
* Add rule to automatically retrieve Natura2000 natural protection areas. Switch of file format to GPKG.
* Add option to set CO2 emission prices through `{opts}` wildcard: `Ep<number>`, e.g. `Ep180`, will set the EUR/tCO2 price.
* Add option to alter marginal costs of a carrier through `{opts}` wildcard: `<carrier>+m<factor>`, e.g. `gas+m2.5`, will multiply the default marginal cost for gas by factor 2.5.
* Clustering strategies for generators and buses have moved from distinct scripts to configurables to unify the process and make it more transparent.
* Hierarchical clustering was introduced. Distance metric is calculated from renewable potentials on hourly (feature entry ends with `-time`) or annual (feature entry in config end with `-cap`) values.
Synchronisation Release - Ukraine and Moldova (17th March 2022)
===============================================================
On March 16, 2022, the transmission networks of Ukraine and Moldova have
successfully been `synchronised with the continental European grid <https://www.entsoe.eu/news/2022/03/16/continental-europe-successful-synchronisation-with-ukraine-and-moldova-power-systems/>`_. We have taken
this as an opportunity to add the power systems of Ukraine and Moldova to
PyPSA-Eur. This includes:
.. image:: img/synchronisation.png
:width: 500
* the transmission network topology from the `ENTSO-E interactive map <https://www.entsoe.eu/data/map/>`_.
* existing power plants (incl. nuclear, coal, gas and hydro) from the `powerplantmatching <https://github.com/fresna/powerplantmatching>`_ tool
* country-level load time series from ENTSO-E through the `OPSD platform <https://data.open-power-system-data.org/time_series/2020-10-06>`_, which are then distributed heuristically to substations by GDP and population density.
* wind and solar profiles based on ERA5 and SARAH-2 weather data
* hydro profiles based on historical `EIA generation data <https://www.eia.gov/international/data/world>`_
* a simplified calculation of wind and solar potentials based on the `Copernicus Land Cover dataset <https://land.copernicus.eu/global/products/lc>`_.
* electrical characteristics of 750 kV transmission lines
The Crimean power system is currently disconnected from the main Ukrainian grid and, hence, not included.
This release is not on the ``master`` branch. It can be used with
.. code-block:: bash
git clone https://github.com/pypsa/pypsa-eur
git checkout synchronisation-release
PyPSA-Eur 0.4.0 (22th September 2021)
=====================================
**New Features and Changes**
* With this release, we change the license from copyleft GPLv3 to the more
liberal MIT license with the consent of all contributors
[`#276 <https://github.com/PyPSA/pypsa-eur/pull/276>`_].
* Switch to the new major ``atlite`` release v0.2. The version upgrade comes
along with significant speed up for the rule ``build_renewable_profiles.py``
(~factor 2). A lot of the code which calculated the land-use availability is now
outsourced and does not rely on ``glaes``, ``geokit`` anymore. This facilitates
the environment building and version compatibility of ``gdal``, ``libgdal`` with
other packages [`#224 <https://github.com/PyPSA/pypsa-eur/pull/224>`_].
* Implemented changes to ``n.snapshot_weightings`` in new PyPSA version v0.18
(cf. `PyPSA/PyPSA/#227 <https://github.com/PyPSA/PyPSA/pull/227>`_)
[`#259 <https://github.com/PyPSA/pypsa-eur/pull/259>`_].
* Add option to pre-aggregate nodes without power injections (positive or
negative, i.e. generation or demand) to electrically closest nodes or neighbors
in ``simplify_network``. Defaults to ``False``. This affects nodes that are no
substations or have no offshore connection.
* In :mod:`simplify_network`, bus columns with no longer correct entries are
removed (symbol, tags, under_construction, substation_lv, substation_off)
[`#219 <https://github.com/PyPSA/pypsa-eur/pull/219>`_]
* Add option to include marginal costs of links representing fuel cells,
electrolysis, and battery inverters
[`#232 <https://github.com/PyPSA/pypsa-eur/pull/232>`_].
* The rule and script ``build_country_flh`` are removed as they are no longer
used or maintained.
* The connection cost of generators in :mod:`simplify_network` are now reported
in ``resources/connection_costs_s{simpl}.csv``
[`#261 <https://github.com/PyPSA/pypsa-eur/pull/261>`_].
* The tutorial cutout was renamed from ``cutouts/europe-2013-era5.nc`` to
``cutouts/be-03-2013-era5.nc`` to accomodate tutorial and productive
cutouts side-by-side.
* The flag ``keep_all_available_areas`` in the configuration for renewable
potentials was deprecated and now defaults to ``True``.
* Update dependencies in ``envs/environment.yaml``
[`#257 <https://github.com/PyPSA/pypsa-eur/pull/257>`_]
* Continuous integration testing switches to Github Actions from Travis CI
[`#252 <https://github.com/PyPSA/pypsa-eur/pull/252>`_].
* Documentation on readthedocs.io is now built with ``pip`` only and no longer
requires ``conda`` [`#267 <https://github.com/PyPSA/pypsa-eur/pull/267>`_].
* Use ``Citation.cff`` [`#273 <https://github.com/PyPSA/pypsa-eur/pull/273>`_].
**Bugs and Compatibility**
* Support for PyPSA v0.18 [`#268 <https://github.com/PyPSA/pypsa-eur/pull/268>`_].
* Minimum Python version set to ``3.8``.
* Removed ``six`` dependency [`#245 <https://github.com/PyPSA/pypsa-eur/pull/245>`_].
* Update :mod:`plot_network` and :mod:`make_summary` rules to latest PyPSA
versions [`#270 <https://github.com/PyPSA/pypsa-eur/pull/270>`_].
* Keep converter links to store components when using the ``ATK``
wildcard and only remove DC links [`#214 <https://github.com/PyPSA/pypsa-eur/pull/214>`_].
* Value for ``co2base`` in ``config.yaml`` adjusted to 1.487e9 t CO2-eq
(from 3.1e9 t CO2-eq). The new value represents emissions related to the
electricity sector for EU+UK+Balkan. The old value was too high and used when
the emissions wildcard in ``{opts}`` was used
[`#233 <https://github.com/PyPSA/pypsa-eur/pull/233>`_].
* Add escape in :mod:`base_network` if all TYNDP links are already
contained in the network
[`#246 <https://github.com/PyPSA/pypsa-eur/pull/246>`_].
* In :mod:`solve_operations_network` the optimised capacities are now
fixed for all extendable links, not only HVDC links
[`#244 <https://github.com/PyPSA/pypsa-eur/pull/244>`_].
* The ``focus_weights`` are now also considered when pre-clustering in
the :mod:`simplify_network` rule
[`#241 <https://github.com/PyPSA/pypsa-eur/pull/241>`_].
* in :mod:`build_renewable_profile` where offshore wind profiles could
no longer be created [`#249 <https://github.com/PyPSA/pypsa-eur/pull/249>`_].
* Lower expansion limit of extendable carriers is now set to the
existing capacity, i.e. ``p_nom_min = p_nom`` (0 before). Simultaneously, the
upper limit (``p_nom_max``) is now the maximum of the installed capacity
(``p_nom``) and the previous estimate based on land availability (``p_nom_max``)
[`#260 <https://github.com/PyPSA/pypsa-eur/pull/260>`_].
* Solving an operations network now includes optimized store capacities
as well. Before only lines, links, generators and storage units were considered
[`#269 <https://github.com/PyPSA/pypsa-eur/pull/269>`_].
* With ``load_shedding: true`` in the solving options of ``config.yaml``
load shedding generators are only added at the AC buses, excluding buses for H2
and battery stores [`#269 <https://github.com/PyPSA/pypsa-eur/pull/269>`_].
* Delete duplicated capital costs at battery discharge link
[`#240 <https://github.com/PyPSA/pypsa-eur/pull/240>`_].
* Propagate the solver log file name to the solver. Previously, the
PyPSA network solving functions were not told about the solver logfile specified
in the Snakemake file [`#247 <https://github.com/PyPSA/pypsa-eur/pull/247>`_]
PyPSA-Eur 0.3.0 (7th December 2020)
===================================
**New Features**
Using the ``{opts}`` wildcard for scenarios:
* An option is introduced which adds constraints such that each country or node produces on average a minimal share of its total consumption itself.
For example ``EQ0.5c`` set in the ``{opts}`` wildcard requires each country to produce on average at least 50% of its consumption. Additionally,
the option ``ATK`` requires autarky at each node and removes all means of power transmission through lines and links. ``ATKc`` only removes
cross-border transfer capacities.
[`#166 <https://github.com/PyPSA/pypsa-eur/pull/166>`_].
* Added an option to alter the capital cost (``c``) or installable potentials (``p``) of carriers by a factor via ``carrier+{c,p}factor`` in the ``{opts}`` wildcard.
This can be useful for exploring uncertain cost parameters.
Example: ``solar+c0.5`` reduces the capital cost of solar to 50% of original values
[`#167 <https://github.com/PyPSA/pypsa-eur/pull/167>`_, `#207 <https://github.com/PyPSA/pypsa-eur/pull/207>`_].
* Added an option to the ``{opts}`` wildcard that applies a time series segmentation algorithm based on renewables, hydro inflow and load time series
to produce a given total number of adjacent snapshots of varying lengths.
This feature is an alternative to downsampling the temporal resolution by simply averaging and
uses the `tsam <https://tsam.readthedocs.io/en/latest/index.html>`_ package
[`#186 <https://github.com/PyPSA/pypsa-eur/pull/186>`_].
More OPSD integration:
* Add renewable power plants from `OPSD <https://data.open-power-system-data.org/renewable_power_plants/2020-08-25>`_ to the network for specified technologies.
This will overwrite the capacities calculated from the heuristic approach in :func:`estimate_renewable_capacities()`
[`#212 <https://github.com/PyPSA/pypsa-eur/pull/212>`_].
* Electricity consumption data is now retrieved directly from the `OPSD website <https://data.open-power-system-data.org/time_series/2019-06-05>`_ using the rule :mod:`build_load_data`.
The user can decide whether to take the ENTSO-E power statistics data (default) or the ENTSO-E transparency data
[`#211 <https://github.com/PyPSA/pypsa-eur/pull/211>`_].
Other:
* Added an option to use custom busmaps in rule :mod:`cluster_network`. To use this feature set ``enable: custom_busmap: true``.
Then, the rule looks for custom busmaps at ``data/custom_busmap_elec_s{simpl}_{clusters}.csv``,
which should have the same format as ``resources/busmap_elec_s{simpl}_{clusters}.csv``.
i.e. the index should contain the buses of ``networks/elec_s{simpl}.nc``
[`#193 <https://github.com/PyPSA/pypsa-eur/pull/193>`_].
* Line and link capacities can be capped in the ``config.yaml`` at ``lines: s_nom_max:`` and ``links: p_nom_max``:
[`#166 <https://github.com/PyPSA/pypsa-eur/pull/166>`_].
* Added Google Cloud Platform tutorial (for Windows users)
[`#177 <https://github.com/PyPSA/pypsa-eur/pull/177>`_].
**Changes**
* Don't remove capital costs from lines and links, when imposing a line volume limit (``lv``) or a line cost limit (``lc``).
Previously, these were removed to move the expansion in direction of the limit
[`#183 <https://github.com/PyPSA/pypsa-eur/pull/183>`_].
* The mappings for clustered lines and buses produced by the :mod:`simplify_network` and :mod:`cluster_network` rules
changed from Hierarchical Data Format (``.h5``) to Comma-Separated Values format (``.csv``) for ease of use.
[`#198 <https://github.com/PyPSA/pypsa-eur/pull/198>`_]
* The N-1 security margin for transmission lines is now fixed to a provided value in ``config.yaml``,
removing an undocumented linear interpolation between 0.5 and 0.7 in the range between 37 and 200 nodes.
[`#199 <https://github.com/PyPSA/pypsa-eur/pull/199>`_].
* Modelling hydrogen and battery storage with Store and Link components is now the default,
rather than using StorageUnit components with fixed power-to-energy ratio
[`#205 <https://github.com/PyPSA/pypsa-eur/pull/205>`_].
* Use ``mamba`` (https://github.com/mamba-org/mamba) for faster Travis CI builds
[`#196 <https://github.com/PyPSA/pypsa-eur/pull/196>`_].
* Multiple smaller changes: Removed unused ``{network}`` wildcard, moved environment files to dedicated ``envs`` folder,
removed sector-coupling components from configuration files, updated documentation colors, minor refactoring and code cleaning
[`#190 <https://github.com/PyPSA/pypsa-eur/pull 190>`_].
**Bugs and Compatibility**
* Add compatibility for pyomo 5.7.0 in :mod:`cluster_network` and :mod:`simplify_network`
[`#172 <https://github.com/PyPSA/pypsa-eur/pull/172>`_].
* Fixed a bug for storage units such that individual store and dispatch efficiencies are correctly taken account of rather than only their round-trip efficiencies.
In the cost database (``data/costs.csv``) the efficiency of battery inverters should be stated as per discharge/charge rather than per roundtrip
[`#202 <https://github.com/PyPSA/pypsa-eur/pull/202>`_].
* Corrected exogenous emission price setting (in ``config: cost: emission price:``),
which now correctly accounts for the efficiency and effective emission of the generators
[`#171 <https://github.com/PyPSA/pypsa-eur/pull/171>`_].
* Corrected HVDC link connections (a) between Norway and Denmark and (b) mainland Italy, Corsica (FR) and Sardinia (IT)
as well as for East-Western and Anglo-Scottish interconnectors
[`#181 <https://github.com/PyPSA/pypsa-eur/pull/181>`_, `#206 <https://github.com/PyPSA/pypsa-eur/pull/206>`_].
* Fix bug of clustering ``offwind-{ac,dc}`` generators in the option of high-resolution generators for renewables.
Now, there are more sites for ``offwind-{ac,dc}`` available than network nodes.
Before, they were clustered to the resolution of the network (``elec_s1024_37m.nc``: 37 network nodes, 1024 generators)
[`#191 <https://github.com/PyPSA/pypsa-eur/pull/191>`_].
* Raise a warning if ``tech_colors`` in the config are not defined for all carriers
[`#178 <https://github.com/PyPSA/pypsa-eur/pull/178>`_].
PyPSA-Eur 0.2.0 (8th June 2020)
==================================
* The optimization is now performed using the ``pyomo=False`` setting in the :func:`pypsa.lopf.network_lopf`. This speeds up the solving process significantly and consumes much less memory. The inclusion of additional constraints were adjusted to the new implementation. They are all passed to the :func:`network_lopf` function via the ``extra_functionality`` argument. The rule ``trace_solve_network`` was integrated into the rule :mod:`solve_network` and can be activated via configuration with ``solving: options: track_iterations: true``. The charging and discharging capacities of batteries modelled as store-link combination are now coupled [`#116 <https://github.com/PyPSA/pypsa-eur/pull/116>`_].
* An updated extract of the `ENTSO-E Transmission System Map <https://www.entsoe.eu/data/map/>`_ (including Malta) was added to the repository using the `GridKit <https://github.com/PyPSA/GridKit>`_ tool. This tool has been updated to retrieve up-to-date map extracts using a single `script <https://github.com/PyPSA/GridKit/blob/master/entsoe/runall_in_docker.sh>`_. The update extract features 5322 buses, 6574 lines, 46 links. [`#118 <https://github.com/PyPSA/pypsa-eur/pull/118>`_].
* Added `FSFE REUSE <https://reuse.software>`_ compliant license information. Documentation now licensed under CC-BY-4.0 [`#160 <https://github.com/PyPSA/pypsa-eur/pull/160>`_].
* Added a 30 minute `video introduction <https://pypsa-eur.readthedocs.io/en/latest/introduction.html>`_ and a 20 minute `video tutorial <https://pypsa-eur.readthedocs.io/en/latest/tutorial.html>`_
* Networks now store a color and a nicely formatted name for each carrier, accessible via ``n.carrier['color']`` and ``n.carrier['nice_name'] ``(networks after ``elec.nc``).
* Added an option to skip iterative solving usually performed to update the line impedances of expanded lines at ``solving: options: skip_iterations:``.
* ``snakemake`` rules for retrieving cutouts and the natura raster can now be disabled independently from their respective rules to build them; via ``config.*yaml`` [`#136 <https://github.com/PyPSA/pypsa-eur/pull/136>`_].
* Removed the ``id`` column for custom power plants in ``data/custom_powerplants.csv`` to avoid custom power plants with conflicting ids getting attached to the wrong bus [`#131 <https://github.com/PyPSA/pypsa-eur/pull/131>`_].
* Add option ``renewables: {carrier}: keep_all_available_areas:`` to use all availabe weather cells for renewable profile and potential generation. The default ignores weather cells where only less than 1 MW can be installed [`#150 <https://github.com/PyPSA/pypsa-eur/pull/150>`_].
* Added a function ``_helpers.load_network()`` which loads a network with overridden components specified in ``snakemake.config['override_components']`` [`#128 <https://github.com/PyPSA/pypsa-eur/pull/128>`_].
* Bugfix in :mod:`base_network` which now finds all closest links, not only the first entry [`#143 <https://github.com/PyPSA/pypsa-eur/pull/143>`_].
* Bugfix in :mod:`cluster_network` which now skips recalculation of link parameters if there are no links [`#149 <https://github.com/PyPSA/pypsa-eur/pull/149>`_].
* Added information on pull requests to contribution guidelines [`#151 <https://github.com/PyPSA/pypsa-eur/pull/151>`_].
* Improved documentation on open-source solver setup and added usage warnings.
* Updated ``conda`` environment regarding ``pypsa``, ``pyproj``, ``gurobi``, ``lxml``. This release requires PyPSA v0.17.0.
PyPSA-Eur 0.1.0 (9th January 2020)
==================================
This is the first release of PyPSA-Eur, a model of the European power system at the transmission network level. Recent changes include:
* Documentation on installation, workflows and configuration settings is now available online at `pypsa-eur.readthedocs.io <pypsa-eur.readthedocs.io>`_ [`#65 <https://github.com/PyPSA/pypsa-eur/pull/65>`_].
* The ``conda`` environment files were updated and extended [`#81 <https://github.com/PyPSA/pypsa-eur/pull/81>`_].
* The power plant database was updated with extensive filtering options via ``pandas.query`` functionality [`#84 <https://github.com/PyPSA/pypsa-eur/pull/84>`_ and `#94 <https://github.com/PyPSA/pypsa-eur/pull/94>`_].
* Continuous integration testing with `Travis CI <https://travis-ci.org>`_ is now included for Linux, Mac and Windows [`#82 <https://github.com/PyPSA/pypsa-eur/pull/82>`_].
* Data dependencies were moved to `zenodo <https://zenodo.org/>`_ and are now versioned [`#60 <https://github.com/PyPSA/pypsa-eur/issues/60>`_].
* Data dependencies are now retrieved directly from within the snakemake workflow [`#86 <https://github.com/PyPSA/pypsa-eur/pull/86>`_].
* Emission prices can be added to marginal costs of generators through the keyworks ``Ep`` in the ``{opts}`` wildcard [`#100 <https://github.com/PyPSA/pypsa-eur/pull/100>`_].
* An option is introduced to add extendable nuclear power plants to the network [`#98 <https://github.com/PyPSA/pypsa-eur/pull/98>`_].
* Focus weights can now be specified for particular countries for the network clustering, which allows to set a proportion of the total number of clusters for particular countries [`#87 <https://github.com/PyPSA/pypsa-eur/pull/87>`_].
* A new rule :mod:`add_extra_components` allows to add additional components to the network only after clustering. It is thereby possible to model storage units (e.g. battery and hydrogen) in more detail via a combination of ``Store``, ``Link`` and ``Bus`` elements [`#97 <https://github.com/PyPSA/pypsa-eur/pull/97>`_].
* Hydrogen pipelines (including cost assumptions) can now be added alongside clustered network connections in the rule :mod:`add_extra_components` . Set ``electricity: extendable_carriers: Link: [H2 pipeline]`` and ensure hydrogen storage is modelled as a ``Store``. This is a first simplified stage [`#108 <https://github.com/PyPSA/pypsa-eur/pull/108>`_].
* Logfiles for all rules of the ``snakemake`` workflow are now written in the folder ``log/`` [`#102 <https://github.com/PyPSA/pypsa-eur/pull/102>`_].
* The new function ``_helpers.mock_snakemake`` creates a ``snakemake`` object which mimics the actual ``snakemake`` object produced by workflow by parsing the ``Snakefile`` and setting all paths for inputs, outputs, and logs. This allows running all scripts within a (I)python terminal (or just by calling ``python <script-name>``) and thereby facilitates developing and debugging scripts significantly [`#107 <https://github.com/PyPSA/pypsa-eur/pull/107>`_].
Release Process
===============
* Checkout a new release branch ``git checkout -b release-v0.x.x``.
* Finalise release notes at ``doc/release_notes.rst``.
* Update ``envs/environment.fixed.yaml`` via
``conda env export -n pypsa-eur -f envs/environment.fixed.yaml --no-builds``
from an up-to-date `pypsa-eur` environment.
* Update version number in ``doc/conf.py`` and ``*config.*.yaml``.
* Open, review and merge pull request for branch ``release-v0.x.x``.
Make sure to close issues and PRs or the release milestone with it (e.g. closes #X).
* Tag a release on Github via ``git tag v0.x.x``, ``git push``, ``git push --tags``. Include release notes in the tag message.
* Upload code to `zenodo code repository <https://doi.org/10.5281/zenodo.3520874>`_ with `MIT license <https://opensource.org/licenses/MIT>`_.
* Create pre-built networks for ``config.default.yaml`` by running ``snakemake -j 1 extra_components_all_networks``.
* Upload pre-built networks to `zenodo data repository <https://doi.org/10.5281/zenodo.3601881>`_ with `CC BY 4.0 <https://creativecommons.org/licenses/by/4.0/>`_ license.
* Send announcement on the `PyPSA and PyPSA-Eur mailing list <https://groups.google.com/forum/#!forum/pypsa>`_.