diff --git a/gtep/gtep_model.py b/gtep/gtep_model.py
index 8d88ade..0635728 100644
--- a/gtep/gtep_model.py
+++ b/gtep/gtep_model.py
@@ -134,19 +134,6 @@ def report_model(self, outfile="pretty_model_output.txt"):
         with open(outfile, "w") as outf:
             self.model.pprint(ostream=outf)
 
-    ## TODO: probably don't have gurobi as default solver? Instead set as open source.
-    def solve_model(self, solver="gurobi", solver_args=None):
-        """Solves the expansion planning model.  Solver_args are passed directly
-        to the chosen solver.  Assigns solution results to self.results.
-
-        Args:
-            solver (str, optional): _description_. Defaults to "gurobi".
-            solver_args (_type_, optional): _description_. Defaults to None.
-        """
-        opt = SolverFactory(solver)
-        TransformationFactory("gdp.bigm").apply_to(self.model)
-        self.results = opt.solve(self.model, tee=False, load_solutions=True)
-
     def report_large_coefficients(self, outfile, magnitude_cutoff):
         """
         Dump very large magnitude (>= 1e5) coefficients to a json file.
@@ -270,6 +257,7 @@ def thermal_uninvested(b, gen):
 
     # Planning reserve requirement constraint
     ## NOTE: renewableCapacityValue is a percentage of renewableCapacity
+    ## TODO: renewableCapacityValue ==> renewableCapacityFactor
     ## NOTE: reserveMargin is a percentage of peakLoad
     ## TODO: check and re-enable with additional bounding transform before bigm
     ## TODO: renewableCapacityValue... should this be time iterated? is it tech based?
@@ -525,7 +513,7 @@ def quickstart_reserve_limits(b, thermalGen):
     b.loadShed = Var(m.buses, domain=NonNegativeReals, initialize=0)
 
     # TODO: adjacent bus angle difference constraints should be added -- what should they be?
-    # TODO: likewise, what do we want angle boudns to actually be?
+    # TODO: likewise, what do we want angle bounds to actually be?
 
     def bus_angle_bounds(b, bus):
         return (-90, 90)
diff --git a/gtep/tests/unit/test_gtep_model.py b/gtep/tests/unit/test_gtep_model.py
index 38f0192..faf2884 100644
--- a/gtep/tests/unit/test_gtep_model.py
+++ b/gtep/tests/unit/test_gtep_model.py
@@ -9,7 +9,7 @@
 from prescient.data.providers import gmlc_data_provider
 from prescient.simulator.options import Options
 from prescient.simulator.config import PrescientConfig
-import datetime
+
 
 import logging
 from io import StringIO
@@ -88,14 +88,16 @@ def test_model_init(self):
         )
 
     # Solve the debug model as is.  Objective value should be $466769.69
-    # Assumes availability of gurobi
+    # Assumes availability of HiGHS
     def test_solve_bigm(self):
         md = read_debug_model()
         modObject = ExpansionPlanningModel(
             data=md, num_reps=1, len_reps=1, num_commit=1, num_dispatch=1
         )
         modObject.create_model()
-        modObject.solve_model()
+        opt = SolverFactory("highs")
+        TransformationFactory("gdp.bigm").apply_to(modObject.model)
+        modObject.results = opt.solve(modObject.model, tee=False, load_solutions=True)
         modObject.report_model()
         self.assertAlmostEqual(
             value(modObject.model.total_cost_objective_rule), 483519.2, places=1