diff --git a/ci-operator/config/Azure/ARO-HCP/Azure-ARO-HCP-main.yaml b/ci-operator/config/Azure/ARO-HCP/Azure-ARO-HCP-main.yaml
index 6912ba3124f4..17958cd069ac 100644
--- a/ci-operator/config/Azure/ARO-HCP/Azure-ARO-HCP-main.yaml
+++ b/ci-operator/config/Azure/ARO-HCP/Azure-ARO-HCP-main.yaml
@@ -710,6 +710,7 @@ tests:
       ARO_HCP_CLOUD: dev
       ARO_HCP_DEPLOY_ENV: ci01
       LOCATION_WEIGHTS: westus3=1,canadacentral=1,centralus=1
+      RUN_COST_TAG_VALUE: "BUILD_ID"
     workflow: aro-hcp-local-e2e
 - always_run: false
   as: e2e-parallel-inplace-upgrade
@@ -724,6 +725,7 @@ tests:
       ARO_HCP_CLOUD: dev
       ARO_HCP_DEPLOY_ENV: ci01
       MULTISTAGE_PARAM_OVERRIDE_LOCATION: canadacentral
+      RUN_COST_TAG_VALUE: "BUILD_ID"
     workflow: aro-hcp-local-e2e-upgrade
 - always_run: false
   as: e2e-parallel-ocp-nightly
@@ -740,6 +742,7 @@ tests:
       ARO_HCP_OPENSHIFT_CHANNEL_GROUP: nightly
       ARO_HCP_OPENSHIFT_NODEPOOL_CHANNEL_GROUP: nightly
       LOCATION_WEIGHTS: westus3=1,canadacentral=1,centralus=1
+      RUN_COST_TAG_VALUE: "BUILD_ID"
     workflow: aro-hcp-local-e2e
 - always_run: false
   as: e2e-parallel-slow
@@ -755,6 +758,7 @@ tests:
       ARO_HCP_DEPLOY_ENV: ci01
       ARO_HCP_E2E_SUITE: rp-api-compat-all/parallel/slow
       LOCATION_WEIGHTS: westus3=1,canadacentral=1,centralus=1
+      RUN_COST_TAG_VALUE: "BUILD_ID"
     workflow: aro-hcp-local-e2e
 - as: global-pipeline-postsubmit
   capabilities:
diff --git a/ci-operator/step-registry/aro-hcp/provision/environment/aro-hcp-provision-environment-ref.yaml b/ci-operator/step-registry/aro-hcp/provision/environment/aro-hcp-provision-environment-ref.yaml
index 4fc503a0f7bd..dc4ee9bed176 100644
--- a/ci-operator/step-registry/aro-hcp/provision/environment/aro-hcp-provision-environment-ref.yaml
+++ b/ci-operator/step-registry/aro-hcp/provision/environment/aro-hcp-provision-environment-ref.yaml
@@ -22,6 +22,13 @@ ref:
     - name: USE_OC_LOGIN_REGISTRIES
       default: ""
       documentation: Space-separated list of registries that require oc registry login for authentication
+    - name: RUN_COST_TAG_VALUE
+      default: ""
+      documentation: |-
+        Value for the jobID.aro-hcp-ci.redhat.com run cost tag on the
+        resource groups this job creates. The literal "BUILD_ID" resolves
+        to this job's Prow build ID; any other value is used verbatim.
+        Empty (the default) disables run cost attribution.
     - name: ARO_HCP_DEPLOY_ENV
       default: "ci00"
       documentation: |-