Hi @GSRuh,
If your cluster has enabled photon you will be charged for it regardless if it benefits your workload or not.
You can find which clusters using photon by checking system table `usage`, searching for the records where `sku_name` contains 'PHOTON' or where `product_features.is_photon` equals `true`. You can use query below to find all your clusters which are using Photon.
select distinct c.account_id, c.workspace_id, c.cluster_id, c.cluster_name, u.sku_name, c.create_time
from system.billing.usage u
join system.compute.clusters c
on u.account_id = c.account_id
and u.workspace_id = c.workspace_id
and u.usage_metadata.cluster_id = c.cluster_id
where u.sku_name like '%PHOTON%'
or u.product_features.is_photon = true;
You can find here how enable system tables for Azure, AWS