# AOSSUS02-BP01 Evaluate instances in alignment to sustainability goals
Reduce carbon footprint, improve sustainability performance, and enhance regulatory compliance by evaluating instance choices that align with your organization's sustainability goals.
**Level of risk exposed if this best practice is not established**: Medium
**Desired outcome**: You use energy-efficient instances that help reduce your carbon footprint.
**Benefits of establishing this best practice:**
+ Reduced carbon footprint due to increased energy efficiency
+ Improved sustainability performance and compliance with organizational goals
+ Enhanced ability to meet environmental regulations and standards
## Implementation guidance
AWS Graviton-based instances use up to 60% less energy than comparable instances.
+ **Identify supported Graviton instance types:** Explore the [available Graviton-based instance types](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/supported-instance-types.html), such as r7g and r6g, that are optimized for OpenSearch and energy efficiency.
+ **Search for suitable instance types:** Explore [Amazon OpenSearch Service pricing](https://aws.amazon.com/opensearch-service/pricing/) to find Graviton-based instances that align with your workload and financial requirements. You can filter results by Region to narrow down the options.
+ **Conduct performance testing:** Run rigorous performance tests to determine the most suitable Graviton instance type for your specific workload.
## Resources
+ [Supported instance types in Amazon OpenSearch Service](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/supported-instance-types.html)
+ [Amazon OpenSearch Service Pricing](https://aws.amazon.com/opensearch-service/pricing/)
+ [OpenSearch Benchmark tool](https://opensearch.org/docs/latest/benchmark/)