azurerm_redis_enterprise_cluster cost estimation

An azurerm_redis_enterprise_cluster is the Enterprise (and Enterprise Flash) tier of Azure Cache for Redis, built on Redis Enterprise with modules (RediSearch, RedisJSON, RedisTimeSeries) and active geo-replication. Cost is a flat hourly fee set by the SKU, charged continuously regardless of usage.

The SKU's E-number is its capacity, and price scales with it: Enterprise_E10-2 is ~$0.834/hour (~$609/month), E20 ~$1.665/hour, E50 ~$4.163/hour, E100 ~$8.325/hour. You pick the capacity tier; the cluster bills it around the clock from creation.

The Enterprise tier is meaningfully more expensive than Standard/Premium Azure Cache for Redis, you're paying for the Redis Enterprise modules, higher throughput, and active geo-replication. If you don't need those, the Standard or Premium tier (a different resource) is far cheaper.

c3x prices the cluster from sku_name, so the standing monthly cost is visible before deployment, and an over-specced capacity tier shows up in review.

Terraform example

A minimal but realistic configuration that C3X can estimate.

resource "azurerm_redis_enterprise_cluster" "cache" {
  name                = "redis-enterprise"
  resource_group_name = azurerm_resource_group.main.name
  location            = azurerm_resource_group.main.location

  sku_name = "Enterprise_E10-2"
}

Pricing dimensions

What you actually pay for when you provision azurerm_redis_enterprise_cluster.

Dimension	Unit	What's being charged
Enterprise cluster	per hour	Flat hourly rate set by the SKU's capacity (E10/E20/E50/E100), charged continuously regardless of usage. $0.834/hour ≈ $608.82/month for Enterprise_E10-2

Sample C3X output

An Enterprise_E10-2 cluster running 24/7:

azurerm_redis_enterprise_cluster.cache
└─ Enterprise cluster (Enterprise_E10-2)   730 hours   $608.82
                                           Monthly     $608.82

Optimization tips

Common ways to reduce azurerm_redis_enterprise_cluster cost without changing the workload.

Use Standard/Premium tier if you don't need Enterprise features

Large vs Enterprise for plain caching

The Enterprise tier costs a large premium for Redis modules (RediSearch, RedisJSON), higher throughput, and active geo-replication. If your workload is plain caching, the Standard or Premium tier of Azure Cache for Redis is far cheaper.

Right-size the capacity tier

Roughly halves cost per tier stepped down

The E-number sets capacity and price, each step up roughly doubles the rate. Size to the working set and throughput you actually need rather than over-provisioning headroom.

Reserve capacity for steady clusters

Up to ~55% on steady clusters

Azure Cache for Redis Enterprise offers reserved capacity pricing for 1-3 year commitments, discounting an always-on production cluster.

Only enable geo-replication where needed

Per avoided linked region

Active geo-replication multiplies cost by running linked clusters in multiple regions. Reserve it for genuine multi-region low-latency or DR requirements.

FAQ

How is Azure Cache for Redis Enterprise billed?

A flat hourly fee set by the SKU's capacity tier (Enterprise_E10/E20/E50/E100), charged continuously regardless of usage. An Enterprise_E10-2 is ~$0.834/hour (~$609/month); each capacity step up roughly doubles the rate.

Why is the Enterprise tier so much more expensive than Standard?

Enterprise includes Redis Enterprise modules (RediSearch, RedisJSON, RedisTimeSeries), higher throughput, and active geo-replication. For plain caching that doesn't need those, the Standard or Premium tier is far cheaper.

How does c3x estimate the cost?

From sku_name, pricing the flat hourly cluster fee for that capacity tier, so the standing monthly cost, and an over-specced tier, is visible before deployment.

Related resources

Azure

azurerm_redis_cache

Standard/Premium Azure Cache for Redis, much cheaper for plain caching

`azurerm_redis_enterprise_cluster` cost estimation