Fix/units currencies with SI prefixes (#1844)

* style: fix spaces in JSON in reporter tutorial

Signed-off-by: F.N. Claessen <felix@seita.nl>

* fix: handle SI-prefixed currencies such as kEUR

Signed-off-by: F.N. Claessen <felix@seita.nl>

* docs: changelog entry

Signed-off-by: F.N. Claessen <felix@seita.nl>

---------

Signed-off-by: F.N. Claessen <felix@seita.nl>
Co-authored-by: Nicolas Höning <nicolas@seita.nl>

Author: Flix6x

documentation/changelog.rst

@@ -67,6 +67,7 @@ Bugfixes
 * Allow consultants to view client users [see `PR #1755 <https://www.github.com/FlexMeasures/flexmeasures/pull/1755>`_]
 * Fix bug where removed flex-model fields don't show up under the dropdown for new fields, except after a page refresh [see `PR #1775 <https://www.github.com/FlexMeasures/flexmeasures/pull/1775>`_]
 * Fix bug in displaying user audit log (incl. expanding its API schema) [see `PR #1779 <https://github.com/FlexMeasures/flexmeasures/pull/1779>`_]
+* Support flex-context prices with SI-prefixed currencies (e.g. kEUR) [see `PR #1844 <https://github.com/FlexMeasures/flexmeasures/pull/1844>`_]
 
 
 v0.29.0 | October 14, 2025

documentation/tut/toy-example-reporter.rst

@@ -108,9 +108,9 @@ In practice, we need to create the `config` and `parameters`:
 
     $ echo "
     $ {
-    $    'weights' : {
-    $        'grid connection capacity' : 1.0,
-    $        'PV' : -1.0,
+    $    'weights': {
+    $        'grid connection capacity': 1.0,
+    $        'PV': -1.0,
     $    }
     $ }" > headroom-config.json
 
@@ -119,9 +119,9 @@ In practice, we need to create the `config` and `parameters`:
 
     $ echo "
     $ {
-    $     'input' : [{'name' : 'grid connection capacity','sensor' : 7},
-    $                {'name' : 'PV', 'sensor' : 3}],
-    $     'output' : [{'sensor' : 8}]
+    $     'input': [{'name': 'grid connection capacity', 'sensor': 7},
+    $                {'name': 'PV', 'sensor': 3}],
+    $     'output': [{'sensor': 8}]
     $ }" > headroom-parameters.json
 
 The output sensor (ID: 8) is actually the one created just to store that information - the headroom our battery has when considering solar production.
@@ -177,8 +177,8 @@ Define parameters in a JSON file:
 
     $ echo "
     $ {
-    $     'input' : [{'sensor' : 4}],
-    $     'output' : [{'sensor' : 9}]
+    $     'input': [{'sensor': 4}],
+    $     'output': [{'sensor': 9}]
     $ }" > inflexible-parameters.json
 
 Create report:
@@ -205,8 +205,8 @@ Define parameters in a JSON file:
 
     $ echo "
     $ {
-    $     'input' : [{'sensor' : 5}],
-    $     'output' : [{'sensor' : 10}]
+    $     'input': [{'sensor': 5}],
+    $     'output': [{'sensor': 10}]
     $ }" > breakable-parameters.json
 
 Create report:
@@ -233,8 +233,8 @@ Define parameters in a JSON file:
 
     $ echo "
     $ {
-    $     'input' : [{'sensor' : 6}],
-    $     'output' : [{'sensor' : 11}]
+    $     'input': [{'sensor': 6}],
+    $     'output': [{'sensor': 11}]
     $ }" > shiftable-parameters.json
 
 Create report:

flexmeasures/utils/unit_utils.py

@@ -56,6 +56,7 @@
 PREFERRED_UNITS_DICT = dict(
     [(ur.parse_expression(x).dimensionality, x) for x in PREFERRED_UNITS]
 )
+SI_PREFIXES = list(ur._prefixes.keys())
 
 
 def to_preferred(x: pint.Quantity) -> pint.Quantity:
@@ -269,56 +270,76 @@ def is_currency_unit(unit: str | pint.Quantity | pint.Unit) -> bool:
     return Currency(code=unit) in list_all_currencies()
 
 
+def strip_si_prefix(unit: str) -> str:
+    """For example:
+    >>> strip_si_prefix("MEUR")
+    'EUR'
+    >>> strip_si_prefix("kEUR")
+    'EUR'
+    >>> strip_si_prefix("cEUR")
+    'EUR'
+    """
+    if len(unit) == 4 and unit[0] in SI_PREFIXES:
+        return unit[1:]
+    return unit
+
+
 def is_price_unit(unit: str) -> bool:
     """For example:
     >>> is_price_unit("EUR/MWh")
     True
+    >>> is_price_unit("kEUR/MWh")
+    True
     >>> is_price_unit("KRW/MWh")
     True
     >>> is_price_unit("KRW/MW")
     True
     >>> is_price_unit("beans/MW")
     False
     """
-    if (
-        unit[:3] in [str(c) for c in list_all_currencies()]
-        and len(unit) > 3
-        and unit[3] == "/"
-    ):
-        return True
-    return False
+    if "/" not in unit:
+        return False
+    currency, _ = unit.split("/", 1)
+    currency = strip_si_prefix(currency)
+    return currency in [str(c) for c in list_all_currencies()]
 
 
 def is_energy_price_unit(unit: str) -> bool:
     """For example:
     >>> is_energy_price_unit("EUR/MWh")
     True
+    >>> is_energy_price_unit("kEUR/MWh")
+    True
     >>> is_energy_price_unit("KRW/MWh")
     True
     >>> is_energy_price_unit("KRW/MW")
     False
     >>> is_energy_price_unit("beans/MW")
     False
     """
-    if is_price_unit(unit) and is_energy_unit(unit[4:]):
-        return True
-    return False
+    if not is_price_unit(unit):
+        return False
+    denom = unit.split("/", 1)[1]
+    return is_energy_unit(denom)
 
 
 def is_capacity_price_unit(unit: str) -> bool:
     """For example:
     >>> is_capacity_price_unit("EUR/MW")
     True
+    >>> is_capacity_price_unit("kEUR/MW")
+    True
     >>> is_capacity_price_unit("KRW/MW")
     True
     >>> is_capacity_price_unit("KRW/MWh")
     False
     >>> is_capacity_price_unit("beans/MWh")
     False
     """
-    if is_price_unit(unit) and is_power_unit(unit[4:]):
-        return True
-    return False
+    if not is_price_unit(unit):
+        return False
+    denom = unit.split("/", 1)[1]
+    return is_power_unit(denom)
 
 
 def is_speed_unit(unit: str) -> bool: