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SPDX-FileCopyrightText: 2019-2020 The PyPSA-Eur Authors
SPDX-License-Identifier: CC-BY-4.0
##########################################
Release Notes
##########################################
Upcoming Release
================
* Switch to new major release, ``>=v0.2.1`` of ``atlite``. 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 landuse 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.
* The minimum python version was set to ``3.8``.
* The rule and script ``build_country_flh`` are removed as they're no longer used or maintained.
* The flag ``keep_all_available_areas`` in the configuration for renewable potentials (config.yaml -> renewable -> {technology}) was deprecated and now defaults to ``True``.
* The tutorial cutout was renamed from ``cutouts/europe-2013-era5.nc`` to ``cutouts/europe-2013-era5-tutorial.nc`` to accomodate tutorial and productive cutouts side-by-side.
* Fix: 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. The old value was ~2x too high and used when the emissions wildcard in ``{opts}`` was used.
* Add option to include marginal costs of links representing fuel cells, electrolysis, and battery inverters
[`#232 <https://github.com/PyPSA/pypsa-eur/pull/232>`_].
* Fix: 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>`_].
* Bugfix in :mod:`solve_operations_network`: 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>`_].
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 `GNU GPL 3.0 <https://www.gnu.org/licenses/gpl-3.0.en.html>`_ license.
* 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>`_.
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