diff --git a/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_20clusters_dispatch_frequency/keras_metadata.pb b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_20clusters_dispatch_frequency/keras_metadata.pb
new file mode 100644
index 00000000..86c807aa
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new file mode 100644
index 00000000..2439b19e
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\ No newline at end of file
diff --git a/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_result_400years_20clusters_OD.json b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_result_400years_20clusters_OD.json
new file mode 100644
index 00000000..54248b13
--- /dev/null
+++ b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_result_400years_20clusters_OD.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue/keras_metadata.pb b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue/keras_metadata.pb
new file mode 100644
index 00000000..e83e09e9
--- /dev/null
+++ b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue/keras_metadata.pb
@@ -0,0 +1,6 @@
+
+Ñ#root"_tf_keras_sequential*¬#{"name": "revenue", "trainable": true, "expects_training_arg": true, "dtype": "float32", "batch_input_shape": null, "must_restore_from_config": false, "class_name": "Sequential", "config": {"name": "revenue", "layers": [{"class_name": "InputLayer", "config": {"batch_input_shape": {"class_name": "__tuple__", "items": [null, 4]}, "dtype": "float32", "sparse": false, "ragged": false, "name": "input_1"}}, {"class_name": "Dense", "config": {"name": "dense", "trainable": true, "dtype": "float32", "units": 100, "activation": "sigmoid", "use_bias": true, "kernel_initializer": {"class_name": "GlorotUniform", "config": {"seed": null}}, "bias_initializer": {"class_name": "Zeros", "config": {}}, "kernel_regularizer": null, "bias_regularizer": null, "activity_regularizer": null, "kernel_constraint": null, "bias_constraint": null}}, {"class_name": "Dense", "config": {"name": "dense_1", "trainable": true, "dtype": "float32", "units": 100, "activation": "sigmoid", "use_bias": true, "kernel_initializer": {"class_name": "GlorotUniform", "config": {"seed": null}}, "bias_initializer": {"class_name": "Zeros", "config": {}}, "kernel_regularizer": null, "bias_regularizer": null, "activity_regularizer": null, "kernel_constraint": null, "bias_constraint": null}}, {"class_name": "Dense", "config": {"name": "dense_2", "trainable": true, "dtype": "float32", "units": 1, "activation": "linear", "use_bias": true, "kernel_initializer": {"class_name": "GlorotUniform", "config": {"seed": null}}, "bias_initializer": {"class_name": "Zeros", "config": {}}, "kernel_regularizer": null, "bias_regularizer": null, "activity_regularizer": null, "kernel_constraint": null, "bias_constraint": null}}]}, "shared_object_id": 10, "input_spec": [{"class_name": "InputSpec", "config": {"dtype": null, "shape": {"class_name": "__tuple__", "items": [null, 4]}, "ndim": 2, "max_ndim": null, "min_ndim": null, "axes": {}}}], "build_input_shape": {"class_name": "TensorShape", "items": [null, 4]}, "is_graph_network": true, "full_save_spec": {"class_name": "__tuple__", "items": [[{"class_name": "TypeSpec", "type_spec": "tf.TensorSpec", "serialized": [{"class_name": "TensorShape", "items": [null, 4]}, "float32", "input_1"]}], {}]}, "save_spec": {"class_name": "TypeSpec", "type_spec": "tf.TensorSpec", "serialized": [{"class_name": "TensorShape", "items": [null, 4]}, "float32", "input_1"]}, "keras_version": "2.9.0", "backend": "tensorflow", "model_config": {"class_name": "Sequential", "config": {"name": "revenue", "layers": [{"class_name": "InputLayer", "config": {"batch_input_shape": {"class_name": "__tuple__", "items": [null, 4]}, "dtype": "float32", "sparse": false, "ragged": false, "name": "input_1"}, "shared_object_id": 0}, {"class_name": "Dense", "config": {"name": "dense", "trainable": true, "dtype": "float32", "units": 100, "activation": "sigmoid", "use_bias": true, "kernel_initializer": {"class_name": "GlorotUniform", "config": {"seed": null}, "shared_object_id": 1}, "bias_initializer": {"class_name": "Zeros", "config": {}, "shared_object_id": 2}, "kernel_regularizer": null, "bias_regularizer": null, "activity_regularizer": null, "kernel_constraint": null, "bias_constraint": null}, "shared_object_id": 3}, {"class_name": "Dense", "config": {"name": "dense_1", "trainable": true, "dtype": "float32", "units": 100, "activation": "sigmoid", "use_bias": true, "kernel_initializer": {"class_name": "GlorotUniform", "config": {"seed": null}, "shared_object_id": 4}, "bias_initializer": {"class_name": "Zeros", "config": {}, "shared_object_id": 5}, "kernel_regularizer": null, "bias_regularizer": null, "activity_regularizer": null, "kernel_constraint": null, "bias_constraint": null}, "shared_object_id": 6}, {"class_name": "Dense", "config": {"name": "dense_2", "trainable": true, "dtype": "float32", "units": 1, "activation": "linear", "use_bias": true, "kernel_initializer": {"class_name": "GlorotUniform", "config": {"seed": null}, "shared_object_id": 7}, "bias_initializer": {"class_name": "Zeros", "config": {}, "shared_object_id": 8}, "kernel_regularizer": null, "bias_regularizer": null, "activity_regularizer": null, "kernel_constraint": null, "bias_constraint": null}, "shared_object_id": 9}]}}, "training_config": {"loss": "mse", "metrics": null, "weighted_metrics": null, "loss_weights": null, "optimizer_config": {"class_name": "Adam", "config": {"name": "Adam", "learning_rate": 0.0010000000474974513, "decay": 0.0, "beta_1": 0.8999999761581421, "beta_2": 0.9990000128746033, "epsilon": 1e-07, "amsgrad": false}}}}2

+Ã
root.layer_with_weights-0"_tf_keras_layer*Œ{"name": "dense", "trainable": true, "expects_training_arg": false, "dtype": "float32", "batch_input_shape": null, "stateful": false, "must_restore_from_config": false, "class_name": "Dense", "config": {"name": "dense", "trainable": true, "dtype": "float32", "units": 100, "activation": "sigmoid", "use_bias": true, "kernel_initializer": {"class_name": "GlorotUniform", "config": {"seed": null}, "shared_object_id": 1}, "bias_initializer": {"class_name": "Zeros", "config": {}, "shared_object_id": 2}, "kernel_regularizer": null, "bias_regularizer": null, "activity_regularizer": null, "kernel_constraint": null, "bias_constraint": null}, "shared_object_id": 3, "input_spec": {"class_name": "InputSpec", "config": {"dtype": null, "shape": null, "ndim": null, "max_ndim": null, "min_ndim": 2, "axes": {"-1": 4}}, "shared_object_id": 12}, "build_input_shape": {"class_name": "TensorShape", "items": [null, 4]}}2

+Ëroot.layer_with_weights-1"_tf_keras_layer*”{"name": "dense_1", "trainable": true, "expects_training_arg": false, "dtype": "float32", "batch_input_shape": null, "stateful": false, "must_restore_from_config": false, "class_name": "Dense", "config": {"name": "dense_1", "trainable": true, "dtype": "float32", "units": 100, "activation": "sigmoid", "use_bias": true, "kernel_initializer": {"class_name": "GlorotUniform", "config": {"seed": null}, "shared_object_id": 4}, "bias_initializer": {"class_name": "Zeros", "config": {}, "shared_object_id": 5}, "kernel_regularizer": null, "bias_regularizer": null, "activity_regularizer": null, "kernel_constraint": null, "bias_constraint": null}, "shared_object_id": 6, "input_spec": {"class_name": "InputSpec", "config": {"dtype": null, "shape": null, "ndim": null, "max_ndim": null, "min_ndim": 2, "axes": {"-1": 100}}, "shared_object_id": 13}, "build_input_shape": {"class_name": "TensorShape", "items": [null, 100]}}2

+Èroot.layer_with_weights-2"_tf_keras_layer*‘{"name": "dense_2", "trainable": true, "expects_training_arg": false, "dtype": "float32", "batch_input_shape": null, "stateful": false, "must_restore_from_config": false, "class_name": "Dense", "config": {"name": "dense_2", "trainable": true, "dtype": "float32", "units": 1, "activation": "linear", "use_bias": true, "kernel_initializer": {"class_name": "GlorotUniform", "config": {"seed": null}, "shared_object_id": 7}, "bias_initializer": {"class_name": "Zeros", "config": {}, "shared_object_id": 8}, "kernel_regularizer": null, "bias_regularizer": null, "activity_regularizer": null, "kernel_constraint": null, "bias_constraint": null}, "shared_object_id": 9, "input_spec": {"class_name": "InputSpec", "config": {"dtype": null, "shape": null, "ndim": null, "max_ndim": null, "min_ndim": 2, "axes": {"-1": 100}}, "shared_object_id": 14}, "build_input_shape": {"class_name": "TensorShape", "items": [null, 100]}}2

+¹
Mroot.keras_api.metrics.0"_tf_keras_metric*‚
{"class_name": "Mean", "name": "loss", "dtype": "float32", "config": {"name": "loss", "dtype": "float32"}, "shared_object_id": 15}2

\ No newline at end of file
diff --git a/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue/saved_model.pb b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue/saved_model.pb
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diff --git a/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue/variables/variables.index b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue/variables/variables.index
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diff --git a/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue_params.json b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue_params.json
new file mode 100644
index 00000000..6ca29ec6
--- /dev/null
+++ b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/FE_surrogates/FE_revenue_params.json
@@ -0,0 +1 @@
+{"xm_inputs": [52.24511646878932, 81.234375, 12.5625, 756.25], "xstd_inputs": [10.396175209391927, 43.27735485631458, 2.499218627891526, 249.92186278915256], "xmin": [-1.1088813691390498, -1.5304626454159493, -1.0253204627247283, -1.0253204627247285], "xmax": [1.7767952759503811, 1.5889516637121004, 0.9753048303966928, 0.9753048303966929], "y_mean": 98131069.42038189, "y_std": 8089960.899734283}
\ No newline at end of file
diff --git a/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/fe_design_w_market_surrogates.py b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/fe_design_w_market_surrogates.py
new file mode 100644
index 00000000..193612ce
--- /dev/null
+++ b/dispatches/case_studies/fossil_case/ultra_supercritical_plant/storage/fe_design_w_market_surrogates.py
@@ -0,0 +1,381 @@
+#################################################################################
+# DISPATCHES was produced under the DOE Design Integration and Synthesis
+# Platform to Advance Tightly Coupled Hybrid Energy Systems program (DISPATCHES),
+# and is copyright (c) 2022 by the software owners: The Regents of the University
+# of California, through Lawrence Berkeley National Laboratory, National
+# Technology & Engineering Solutions of Sandia, LLC, Alliance for Sustainable
+# Energy, LLC, Battelle Energy Alliance, LLC, University of Notre Dame du Lac, et
+# al. All rights reserved.
+#
+# Please see the files COPYRIGHT.md and LICENSE.md for full copyright and license
+# information, respectively. Both files are also available online at the URL:
+# "https://github.com/gmlc-dispatches/dispatches".
+#
+#################################################################################
+
+"""
+This script runs the design case study for the fossils case using
+market surrogates. It uses the multiperiod model class for the integrated
+power plant with energy storage. The revenue and dispatch surrogates are in
+keras. This implementation is pinned to the following version of the respective
+packages. OMLT is v1.0, ONNX is v1.12.0, TensorFlow is v1.19.4.
+"""
+
+__author__ = "Naresh Susarla"
+
+
+import os
+import json
+import numpy as np
+import matplotlib.pyplot as plt
+from tensorflow import keras
+
+from pyomo.common.fileutils import this_file_dir
+from pyomo.environ import (
+    ConcreteModel,
+    Param,
+    SolverFactory,
+    Var, 
+    NonNegativeReals, 
+    units as pyunits, 
+    Expression, 
+    Constraint,
+    Objective, 
+    sqrt,
+)
+import idaes.logger as idaeslog
+from idaes.apps.grid_integration.multiperiod.multiperiod import (
+    MultiPeriodModel)
+from dispatches.case_studies.fossil_case.ultra_supercritical_plant.storage.\
+    multiperiod_integrated_storage_usc import (create_usc_model,
+                                               usc_custom_init,
+                                               # usc_unfix_dof,
+                                               get_usc_link_variable_pairs)
+
+import omlt  # omlt can encode the neural networks in Pyomo
+from omlt.neuralnet import FullSpaceNNFormulation
+from omlt.io import load_keras_sequential
+# from pyomo.repn.plugins.nl_writer import _activate_nl_writer_version
+# _activate_nl_writer_version(2)
+
+# For plots
+from matplotlib import pyplot as plt
+import matplotlib
+matplotlib.rc('font', size=24)
+plt.rc('axes', titlesize=24)
+scaling_obj = 1
+scaling_factor = 1
+
+
+NUM_REP_DAYS = 20               # Number of clusters/representative days
+n_time_points = 24
+# path for folder that has surrogate models
+surrogate_dir = os.path.join(this_file_dir(), "FE_surrogates")
+
+# ================= Read the cluster centers (dispatch representative days) ====================
+with open(os.path.join(surrogate_dir, "FE_result_400years_20clusters_OD.json"), 'r') as f:
+    cluster_results = json.load(f)
+cluster_center = np.array(cluster_results['model_params']['cluster_centers_'])
+cluster_center = cluster_center.reshape(20, 24)[0:NUM_REP_DAYS]
+# cluster_condensed = cluster[0:2, :]
+# add zero/full capacity days to the clustering results. 
+full_days = np.array([np.ones(24)])
+zero_days = np.array([np.zeros(24)])
+
+# corresponds to the ws, ws[0] is for zero cf days and ws[31] is for full cd days.
+cluster_centers = np.concatenate((zero_days, cluster_center, full_days), axis=0)
+# ===============================================================================================
+
+# ================ Get input-output scaling factors for dispatch frequency ======================
+with open(os.path.join(surrogate_dir, "FE_20clusters_dispatch_frequency_params.json"), 'rb') as f:
+    dispatch_data = json.load(f)
+
+# Dispatch frequency surrogate
+input_bounds_dispatch = {
+    i: (dispatch_data['xmin'][i], dispatch_data['xmax'][i]) 
+    for i in range(len(dispatch_data['xmin']))
+}
+scaling_object_dispatch = omlt.OffsetScaling(
+    offset_inputs=dispatch_data['xm_inputs'],
+    factor_inputs=dispatch_data['xstd_inputs'],
+    offset_outputs=dispatch_data['ws_mean'],
+    factor_outputs=dispatch_data['ws_std'],
+)
+
+# load keras neural networks for weights 
+nn_dispatch = keras.models.load_model(os.path.join(surrogate_dir, "FE_20clusters_dispatch_frequency"))
+net_dispatch_defn = load_keras_sequential(nn_dispatch, scaling_object_dispatch, input_bounds_dispatch)
+# ==================================================================================================
+
+# ================ Get input-output scaling factors for revenue ====================================
+with open(os.path.join(surrogate_dir, "FE_revenue_params.json"), 'rb') as f:
+    revenue_data = json.load(f)
+
+input_bounds_revenue = {
+    i: (revenue_data['xmin'][i], revenue_data['xmax'][i]) 
+    for i in range(len(revenue_data['xmin']))
+}
+scaling_object_revenue = omlt.OffsetScaling(
+    offset_inputs=revenue_data["xm_inputs"],
+    factor_inputs=revenue_data["xstd_inputs"],
+    offset_outputs=[revenue_data["y_mean"]],
+    factor_outputs=[revenue_data["y_std"]],
+)
+
+nn_revenue = keras.models.load_model(os.path.join(surrogate_dir, "FE_revenue"))
+revenue_defn = load_keras_sequential(nn_revenue, scaling_object_revenue, input_bounds_revenue)
+# ====================================================================================================
+
+def _get_dispatch_capacity_factors():
+    
+    file_name = 'FE_dispatch_95_5_median_separate.json'
+    # file_name = 'FE_dispatch_95_5_median_separate_3_day.json'
+
+    with open(os.path.join(surrogate_dir, file_name), 'rb') as f:
+        sep_data = json.load(f)
+
+    # this for no sub scenario model.
+    full_day_gen_cf = [1.0]*24
+    full_day_stor_cf = [0.0]*24
+    
+    zero_day_gen_cf = [0.0]*24
+    zero_day_stor_cf = [0.0]*24
+    
+    cluster_cf = sep_data['median_dispatch']
+    
+    gen_cf = []
+    stor_cf = []
+
+    # append cf for zero days
+    gen_cf.append(zero_day_gen_cf)
+    stor_cf.append(zero_day_stor_cf)
+
+    # append cf for rep days
+    for index, value in enumerate(cluster_cf):
+        gen_cf.append(cluster_cf[str(index)][0])
+        stor_cf.append(cluster_cf[str(index)][1])
+
+    # append cf for full day
+    gen_cf.append(full_day_gen_cf)
+    stor_cf.append(full_day_stor_cf)
+
+    return gen_cf, stor_cf
+
+def usc_unfix_dof(m):
+    # Unfix data
+    m.fs.boiler.inlet.flow_mol[0].unfix()
+
+    # Unfix storage system data
+    m.fs.ess_hp_split.split_fraction[0, "to_hxc"].unfix()
+    m.fs.ess_bfp_split.split_fraction[0, "to_hxd"].unfix()
+    for salt_hxc in [m.fs.hxc]:
+        salt_hxc.shell_inlet.unfix()
+        salt_hxc.tube_inlet.flow_mass.unfix()  # kg/s, 1 DOF
+        salt_hxc.area.unfix()  # 1 DOF
+
+    for salt_hxd in [m.fs.hxd]:
+        salt_hxd.tube_inlet.unfix()
+        salt_hxd.shell_inlet.flow_mass.unfix()  # kg/s, 1 DOF
+        salt_hxd.area.unfix()  # 1 DOF
+
+    for unit in [m.fs.cooler]:
+        unit.inlet.unfix()
+    m.fs.cooler.outlet.enth_mol[0].unfix()  # 1 DOF
+
+    # Fix storage heat exchangers area and salt temperatures
+    # m.fs.hxc.area.fix(1904)
+    # m.fs.hxd.area.fix(2830)
+    m.fs.hxc.tube_outlet.temperature[0].fix(831)
+    m.fs.hxd.shell_inlet.temperature[0].fix(831)
+    m.fs.hxd.shell_outlet.temperature[0].fix(513.15)
+    
+def build_design_model_w_surrogates(n_rep_days, reserve=10, max_lmp=500):
+
+    # Concrete model
+    m = ConcreteModel(name='FE_design_model_w_surrogates')
+
+    # Inputs to the frequency surrogates: discharge marginal cost, storage size, reserve %, max lmp
+    m.discharge_marginal_cost = Var(
+        within=NonNegativeReals,
+        bounds=(40, 80),
+        initialize=70,
+        doc="Marginal cost at which storage will be discharged",
+    )
+    m.storage_size = Var(
+        within=NonNegativeReals,
+        bounds=(15, 150),
+        initialize=150,
+        doc="Size of storage in MW",
+    )
+    m.reserve = Var(
+        within=NonNegativeReals,
+        doc="Percentage of reserves",
+    )
+    m.max_lmp = Var(
+        within=NonNegativeReals,
+        doc="Maximum LMP",
+    )
+    m.reserve.fix(reserve)
+    m.max_lmp.fix(max_lmp)  
+
+    # Add NN surrogates for dispatch frequency to the model using omlt
+    m.fe_dispatch = omlt.OmltBlock()
+    m.fe_dispatch.build_formulation(FullSpaceNNFormulation(net_dispatch_defn))
+
+    # Add NN surrogate for revenue to the model
+    m.fe_revenue = omlt.OmltBlock()
+    m.fe_revenue.build_formulation(FullSpaceNNFormulation(revenue_defn))
+
+    inputs = [m.discharge_marginal_cost, m.storage_size, m.reserve, m.max_lmp]  
+
+    @m.Constraint(range(len(inputs)))
+    def input_variable_equality_dispatch(blk, i):
+        return inputs[i] == blk.fe_dispatch.inputs[i]
+
+    @m.Constraint(range(len(inputs)))
+    def input_variable_equality_revenue(blk, i):
+        return inputs[i] == blk.fe_revenue.inputs[i]
+    
+    m.set_days = [i for i in range(n_rep_days)]
+
+    m.electricity_revenue = Var(within=NonNegativeReals, initialize=1e9)
+    m.weights = Var(
+        m.set_days, 
+        within=NonNegativeReals,
+        initialize={x: 1 / n_rep_days for x in m.set_days},
+    )
+    m.weights_non_neg = Var(
+        m.set_days, 
+        within=NonNegativeReals,
+        initialize={x: 1 / n_rep_days for x in m.set_days},
+    )
+
+    # Convert any negative weights to postive weights.
+    @m.Constraint(m.set_days)
+    def non_neg_weights_definition(blk, i):
+        return (
+            blk.weights_non_neg[i] == 0.5 * sqrt(blk.fe_dispatch.outputs[i]**2 + 0.001**2) + 0.5 * blk.fe_dispatch.outputs[i]
+        )
+
+    # Re-scale weights so that the add up to one
+    @m.Constraint(m.set_days)
+    def weights_definition(blk, i):
+        return (
+            blk.weights[i] * sum(blk.weights_non_neg[j] for j in m.set_days) == blk.weights_non_neg[i]
+        )
+
+    # Revenue from the surrogates
+    m.revenue_surrogate = Constraint(expr=m.electricity_revenue == m.fe_revenue.outputs[0])
+
+    # Create the multiperiod model object. You can pass arguments to your
+    # "process_model_func" for each time period using a dict of dicts as
+    # shown here.  In this case, it is setting up empty dictionaries for
+    # each time period.
+    m.mp_fe_model = MultiPeriodModel(
+        n_time_points=n_time_points,
+        set_days=m.set_days,
+        process_model_func=create_usc_model,
+        initialization_func=usc_custom_init,
+        unfix_dof_func=usc_unfix_dof,
+        linking_variable_func=get_usc_link_variable_pairs,
+        flowsheet_options={"pmin": None,
+                           "pmax": None},
+        use_stochastic_build=True,
+        outlvl=idaeslog.INFO,
+        )
+
+    # Retrieve active process blocks (i.e. time blocks)
+    blks = [m.mp_fe_model.period[t, d] for (t, d) in m.mp_fe_model.set_period]
+    
+    # Compute operating cost
+    for blk in blks:
+        blk.operating_cost = Expression(
+            expr=(
+                (blk.fs.operating_cost
+                 + blk.fs.plant_fixed_operating_cost
+                 + blk.fs.plant_variable_operating_cost) / (365 * 24)
+            )
+        )
+
+    # Compute the total operating cost for all rep days
+    m.total_operating_cost = Expression(
+    expr=sum(
+        m.weights[d] * 366 * m.mp_fe_model.period[t, d].operating_cost
+        for (t, d) in m.mp_fe_model.set_period
+    ))
+
+    # Add the dispatch constaint on the net power using the capcity factors
+    # The power must be scaled using the capacity factor, Pmin, Pmax, Pstorage
+    m.plant_pmin = Param(
+        initialize=284,
+        mutable=False,
+        units=pyunits.MW,
+        doc='Pmin for thermal generator alone')
+    m.plant_pmax = Param(
+        initialize=436,
+        mutable=False,
+        units=pyunits.MW,
+        doc='Pmax for thermal generator alone')
+
+    # Get dispatch capcity factors from json
+    cf_plant, cf_storage = _get_dispatch_capacity_factors()
+
+    @m.Constraint(m.mp_fe_model.set_period)
+    def power_dispatch_constraint(blk, t, d):
+        return (
+            blk.mp_fe_model.period[t, d].fs.net_power >=
+            m.plant_pmin + (m.plant_pmax - m.plant_pmin) * cf_plant[d][t-1] +
+            m.storage_size * cf_storage[d][t-1]
+        )
+
+    m.hxc_area = Var(
+        within=NonNegativeReals,
+        bounds=(0, 5000),
+        initialize=1904,
+        doc="area of charge heat exchanger",
+    )
+    m.hxd_area = Var(
+        within=NonNegativeReals,
+        bounds=(0, 5000),
+        initialize=2830,
+        doc="area of discharge heat exchanger",
+    )
+    @m.Constraint(m.mp_fe_model.set_period)
+    def charge_hx_area_constraint(blk, t, d):
+        return (
+            blk.mp_fe_model.period[t, d].fs.hxc.area ==
+            m.hxc_area
+        )
+    @m.Constraint(m.mp_fe_model.set_period)
+    def discharge_hx_area_constraint(blk, t, d):
+        return (
+            blk.mp_fe_model.period[t, d].fs.hxd.area ==
+            m.hxd_area
+        )
+
+    # The objective is minimize: cost - revenue
+    m.obj = Objective(expr=m.total_operating_cost - m.electricity_revenue)
+
+    # Initial state for the power plant the salt tank are fixed
+    for d in m.set_days:
+        # Starting from a fully charged state for each representative day
+        m.mp_fe_model.period[1, d].fs.previous_salt_inventory_hot.fix(6739292-1103053.48)
+        m.mp_fe_model.period[1, d].fs.previous_salt_inventory_cold.fix(1103053.48)
+        m.mp_fe_model.period[1, d].fs.previous_power.fix(447.66)
+
+    # Plot results
+    opt = SolverFactory('ipopt')
+    opt.solve(m, tee=True)
+
+    return m
+
+
+
+if __name__ == "__main__":
+
+    n_rep_days = NUM_REP_DAYS+2 
+    # gen_cf, stor_cf = _get_dispatch_capacity_factors()
+    m = build_design_model_w_surrogates(n_rep_days,
+                                        reserve=10,
+                                        max_lmp=500)
+