Eq

src/energia/components/operations/operation.py

@@ -147,7 +147,7 @@ def _check_capacity_bound(self, space: Location | Linkage):
         if space not in self.capacity_aspect.bound_spaces[self]["ub"]:
             # check if operational capacity has been bound
             # this is not a check, this generates a constraint
-            _ = self.capacity_sample(space, self.horizon) == True
+            _ = self.capacity_sample(space, self.horizon) >= 0
 
             return self, space, self.horizon
 

src/energia/components/operations/storage.py

@@ -193,7 +193,7 @@ def _check_capacity_bound(self, space: Location) -> bool:
         if space not in self.capacity_aspect.bound_spaces[self.stored]["ub"]:
             # check if the storage capacity has been bound at that location
             # Note: this is not a check, this generates a constraint
-            _ = self.capacity(space, self.horizon) == True
+            _ = self.capacity(space, self.horizon) >= 0
 
             return self, space, self.horizon
 
@@ -203,7 +203,7 @@ def _init_inventory_aspect(self):
         """Initializes the inventory aspect bound spaces for the stored resource"""
         if self.stored not in self.inventory_aspect.bound_spaces:
 
-            _ = self.inventory_aspect(self.stored) == True
+            _ = self.inventory_aspect(self.stored) >= 0
 
     def _get_times(self, space: Location) -> list[Periods]:
         """Gets times where inventory is defined"""

src/energia/library/examples/energy.py

@@ -265,8 +265,8 @@ def design_scheduling_material_modes():
     )
 
     m.declare(Resource, ["power", "wind", "solar"])
-    _ = m.solar.consume == True
-    _ = m.wind.consume == True
+    _ = m.solar.consume >= 0
+    _ = m.wind.consume >= 0
     _ = m.power.release.prep(180) >= [0.6, 0.7, 0.8, 0.3]
 
     _ = m.gwp.emit(m.lir.consume) == 9600

src/energia/modeling/constraints/balance.py

@@ -228,7 +228,7 @@ def _init_sample(self):
         lower_times = [t for t in _balances if t > self.time] if _balances else False
 
         if lower_times:
-            _ = self.aspect(self.commodity, self.space, lower_times[0]) == True
+            _ = self.aspect(self.commodity, self.space, lower_times[0]) >= 0
 
     def __eq__(self, other: Self):
         return is_(self.aspect, other.aspect) and self.domain == other.domain

src/energia/modeling/constraints/bind.py

@@ -5,6 +5,7 @@
 import logging
 from functools import cached_property
 from typing import TYPE_CHECKING
+
 from gana import V
 from gana.sets.function import F
 

src/energia/modeling/indices/sample.py

@@ -481,7 +481,7 @@
             return getattr(self.program, self.aspect.name)(*self.domain.I)
 
         except AttributeError:
-            _ = self == True
+            _ = self >= 0
             return getattr(self.program, self.aspect.name)(*self.domain.I)
 
         except KeyError:
@@ -659,7 +659,15 @@
         Bind(sample=self, parameter=other, leq=True, forall=self._forall)
 
     def __ge__(self, other):
-        Bind(sample=self, parameter=other, geq=True, forall=self._forall)
+
+        if self.aspect.nn and isinstance(other, (int, float)) and other == 0:
+            # if a zero lower bound is given
+            # just declare the variable
+            # it will be non-negative by default
+            # and will begin a commodity balance
+            self.V()
+        else:
+            Bind(sample=self, parameter=other, geq=True, forall=self._forall)
 
     def __eq__(self, other):
 
@@ -678,7 +686,7 @@
 
         else:
             if callable(self.of):
-                _ = self.of(*self.domain.index_primary[1:]) == True
+                _ = self.of(*self.domain.index_primary[1:]) >= 0
             Bind(sample=self, parameter=other, eq=True, forall=self._forall)
 
     def __gt__(self, other):