Release v0.7.0.dev2

v0.7 includes a major change to how Calliope internally operates.
Along with this, there are multiple changes to how Calliope models are defined and configured.
This requires adapting models to work with v0.7.

Due to the scale of these changes, we are staging the development with a series of pre-releases for users to test the functionality.

Below is a summary of the changes made in this pre-release. For more detail on the changes in v0.7 compared to v0.6, see our page on migrating between the two in our documentation.

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|new| Storage buffers available in all technology base classes.

|new| Multiple carriers and different carriers in/out available in all technology base classes.

|new| node_groups added to match tech_groups.

|new| technology efficiencies split into inflow and outflow efficiencies.

|new| Technology capacities and efficiencies can be differentiated between technology carriers.

|new| Parameters can be defined outside the scope of nodes and techs using the top-level parameters key in YAML.

|new| Any parameters can be indexed over arbitrary dimensions, both core Calliope dimensions and new, user-defined dimensions.

|new| Non-timeseries data can be loaded from CSV files or in-memory Pandas DataFrames using the top-level data_sources key in YAML.

|new| User-defined mathematical formulations using the new Calliope math syntax can be loaded when creating a model.

|new| Shadow prices obtained from a dual LP problem can be read by using model.backend.shadow_prices.get("constraint_name").

|changed| |backwards-incompatible| Updated to support Python versions >= 3.10.

|changed| |backwards-incompatible| Updated to Pandas >= v2.1, Pyomo >= v6.4, Xarray >= v2023.10.

|changed| |backwards-incompatible| Flat technology definitions, removing the distinction between essentials, constraints and costs.

|changed| |backwards-incompatible| Timeseries data is defined under the data_sources top-level key, not with file=/df= at the technology level.

|changed| |backwards-incompatible| Demand and carrier consumption values are strictly positive instead of strictly negative.

|changed| |backwards-incompatible| model.run() method → two-stage model.build() + model.solve() methods.

|changed| |backwards-incompatible| model and run top-level keys → config.init/.build/.solve.

|changed| |backwards-incompatible| locations top-level key and loc data dimensions → nodes.

|changed| |backwards-incompatible| parent technology parameter → base_tech + inherit.

|changed| |backwards-incompatible| Cost parameters are flattened and use the indexed parameter syntax.

|changed| |backwards-incompatible| links top-level key → transmission links defined in techs.

|changed| |backwards-incompatible| Various parameters/decision variables renamed (namely energy_ → flow_, carrier_prod/_con → flow_out/_in, and resource → source_use/sink_use).

|changed| |backwards-incompatible| Various configuration options renamed.

|changed| |backwards-incompatible| force_resource technology parameter → source_use_equals / sink_use_equals.

|changed| |backwards-incompatible| units + purchased decision variables → purchased_units.

|changed| |backwards-incompatible| Parameters added to explicitly trigger MILP and storage decision variables/constraints.

|changed| |backwards-incompatible| Structure of input and output data within a Calliope model updated to remove concatenated loc::tech::carrier sets and technology subsets (e.g. techs_supply) in favour of sparse arrays indexed over core dimensions only (nodes, techs, carriers, timesteps).

|changed| |backwards-incompatible| coordinates.lat/lon node parameter → latitude/longitude.

|changed| |backwards-incompatible| Distance units default to kilometres and can be reverted to metres with config.init.distance_unit.

|changed| |backwards-incompatible| operate mode input parameters now expected to match plan mode decision variable names (e.g., flow_cap).

|changed| |backwards-incompatible| Cyclic storage is defined per-technology, not as a top-level configuration option.

|changed| Documentation has been overhauled.

|removed| _equals constraints.
Use both _min and _max constraints to the same value.

|removed| x/y coordinates.
Use geographic lat/lon coordinates (in EPSG:4326 projection) instead.

|removed| Comma-separated node definitions.
Inheriting duplicate definitions from node_groups instead.

|removed| supply_plus and conversion_plus technology base classes.
Use supply and conversion technology base classes instead.

|removed| carrier key.
Use carrier_in and carrier_out instead.

|removed| carrier_tiers and carrier_ratios.
Use indexed parameter definitions for flow_out_eff and custom math instead.

|removed| calliope.Model.get_formatted_array.
The Calliope internal representation of data now matches the format achieved by calling this method in v0.6.

|removed| Group constraints.
Use custom math instead.

|removed| Configuration options for features we no longer support.

|removed| Plotting.
See our documentation for example of how to visualise your data with Plotly.

|removed| Clustering.
Cluster your data before creating your Calliope model.
Mapping of timeseries dates to representative days is still possible.