add option for p_nom_max factors in {opts} wildcard (#207)

* prepare: add option for potential reduction sweeps

* prepare: fix attr lookup for potential/cost reduction sweeps

* prepare: fix attr naming cost -> capital_cost

* add release notes

doc/configtables/opts.csv

@@ -7,4 +7,4 @@ Trigger, Description, Definition, Status
 ``ATK``, "Require each node to be autarkic. Example: ``ATK`` removes all lines and links. ``ATKc`` removes all cross-border lines and links.", ``prepare_network``, In active use
 ``BAU``, Add a per-``carrier`` minimal overall capacity; i.e. at least ``40GW`` of ``OCGT`` in Europe; configured in ``electricity: BAU_mincapacities``, ``solve_network``: `add_opts_constraints() <https://github.com/PyPSA/pypsa-eur/blob/6b964540ed39d44079cdabddee8333f486d0cd63/scripts/solve_network.py#L66>`_, Untested
 ``SAFE``, Add a capacity reserve margin of a certain fraction above the peak demand to which renewable generators and storage do *not* contribute. Ignores network., ``solve_network`` `add_opts_constraints() <https://github.com/PyPSA/pypsa-eur/blob/6b964540ed39d44079cdabddee8333f486d0cd63/scripts/solve_network.py#L73>`_, Untested
-``carrier+factor``, "Alter the capital cost of a carrier by a factor. Example: ``solar+0.5`` reduces the capital cost of solar to 50\% of original values.", ``prepare_network``, In active use
+``carrier+{c|p}factor``, "Alter the capital cost (``c``) or installable potential (``p``) of a carrier by a factor. Example: ``solar+c0.5`` reduces the capital cost of solar to 50\% of original values.", ``prepare_network``, In active use

doc/release_notes.rst

@@ -17,7 +17,10 @@ Upcoming Release
   cross-border transfer capacities. Moreover, 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 an option to alter the capital cost of carriers by a factor via ``carrier+factor`` in the ``{opts}`` wildcard. This can be useful for exploring uncertain cost parameters. Example: ``solar+0.5`` reduces the capital cost of solar to 50% of original values (`#167 <https://github.com/PyPSA/pypsa-eur/pull/167>`_).
+* 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>`_ and `#207 <https://github.com/PyPSA/pypsa-eur/pull/207>`_).
 
 * Add compatibility for pyomo 5.7.0 in :mod:`cluster_network` and :mod:`simplify_network`.
 

scripts/prepare_network.py

@@ -205,14 +205,17 @@ if __name__ == "__main__":
         suptechs = map(lambda c: c.split("-", 2)[0], n.carriers.index)
         if oo[0].startswith(tuple(suptechs)):
             carrier = oo[0]
-            cost_factor = float(oo[1])
+            # handles only p_nom_max as stores and lines have no potentials
+            attr_lookup = {"p": "p_nom_max", "c": "capital_cost"}
+            attr = attr_lookup[oo[1][0]]
+            factor = float(oo[1][1:])
             if carrier == "AC":  # lines do not have carrier
-                n.lines.capital_cost *= cost_factor
+                n.lines[attr] *= factor
             else:
-                comps = {"Generator", "Link", "StorageUnit"}
+                comps = {"Generator", "Link", "StorageUnit", "Store"}
                 for c in n.iterate_components(comps):
                     sel = c.df.carrier.str.contains(carrier)
-                    c.df.loc[sel,"capital_cost"] *= cost_factor
+                    c.df.loc[sel,attr] *= factor
 
     if 'Ep' in opts:
         add_emission_prices(n)