Bugfix: Connecting resource to multiple techs (#655)

* bugfix and added test for connecting one resource model to multiple techs

* updated changelog

* Updated test to call setup to trigger connection error

---------

Co-authored-by: John Jasa <johnjasa11@gmail.com>

Author: elenya-grant

CHANGELOG.md

@@ -33,6 +33,7 @@
 - Added a storage performance baseclass model `StoragePerformanceBase` and updated the other storage performance models to inherit it [PR 624](https://github.com/NatLabRockies/H2Integrate/pull/624)
 - Modified the calc tilt angle function for pysam solar to support latitudes in the southern hemisphere [PR 646](https://github.com/NatLabRockies/H2Integrate/pull/646)
 - Added oxygen production metrics and as outputs to `ECOElectrolyzerPerformanceModel` [PR 642](https://github.com/NatLabRockies/H2Integrate/pull/642)
+- Bugfix to allow for one resource to be connected to multiple technologies [PR 655](https://github.com/NatLabRockies/H2Integrate/pull/655)
 - Removed the last of the logic that was based on technology names rather than model classes [PR 654](https://github.com/NatLabRockies/H2Integrate/pull/654)
 
 ## 0.7.1 [March 13, 2026]

h2integrate/core/file_utils.py

@@ -143,7 +143,7 @@ def find_file(filename: str | Path, root_folder: str | Path | None = None):
             f"the root directory {root_folder}."
         )
     raise ValueError(
-        f"Cannot find unique file: found {len(files_cwd)} files relative to cwd, "
+        f"Cannot find unique file for {filename}: found {len(files_cwd)} files relative to cwd, "
         f"{len(files_h2i)} files relative to H2Integrate root directory, "
         f"{len(files)} files relative to the root folder."
     )

h2integrate/core/h2integrate_model.py

@@ -1167,7 +1167,7 @@ def connect_technologies(self):
             resource_models = {}
             for site_grp, site_grp_inputs in self.plant_config["sites"].items():
                 for resource_key, resource_params in site_grp_inputs.get("resources", {}).items():
-                    resource_models[f"{site_grp}-{resource_key}"] = resource_params
+                    resource_models[f"{site_grp}.{resource_key}"] = resource_params
 
             resource_source_connections = [c[0] for c in resource_to_tech_connections]
             # Check if there is a missing resource to tech connection or missing resource model

h2integrate/core/test/test_framework.py

@@ -324,6 +324,33 @@ def test_resource_connection_error_missing_resource(temp_dir):
     temp_highlevel_yaml.unlink(missing_ok=True)
 
 
+@pytest.mark.unit
+def test_no_resource_connection_error_resource_to_multiple_techs(temp_dir):
+    # Path to the original plant_config.yaml and high-level yaml in the example directory
+
+    driver_config = load_driver_yaml(EXAMPLE_DIR / "08_wind_electrolyzer" / "driver_config.yaml")
+    tech_config = load_tech_yaml(EXAMPLE_DIR / "08_wind_electrolyzer" / "tech_config.yaml")
+    plant_config = load_plant_yaml(EXAMPLE_DIR / "08_wind_electrolyzer" / "plant_config.yaml")
+    # Add a second wind technology
+    wind_tech = tech_config["technologies"]["wind"]
+    tech_config["technologies"].update({"wind_plant2": wind_tech})
+    resource_to_tech_connections = [
+        ["site.wind_resource", "wind", "wind_resource_data"],
+        ["site.wind_resource", "wind_plant2", "wind_resource_data"],
+    ]
+    plant_config["resource_to_tech_connections"] = resource_to_tech_connections
+    input_config = {
+        "plant_config": plant_config,
+        "technology_config": tech_config,
+        "driver_config": driver_config,
+    }
+    h2i_model = H2IntegrateModel(input_config)
+    h2i_model.setup()
+    # Need to call final_setup to trigger the potential error related to the resource connections
+    h2i_model.prob.final_setup()
+    assert True
+
+
 @pytest.mark.unit
 def test_reports_turned_off(temp_dir):
     # Path to the original config files in the example directory