Sustainable data center infrastructure planning focuses on creating facilities that balance operational performance with responsible resource management. As organizations continue to expand their digital services, the demand for energy efficient, reliable, and environmentally conscious data centers has grown significantly. Careful planning helps reduce energy consumption, improve cooling efficiency, optimize hardware utilization, and support long term operational goals. Understanding the principles of sustainable infrastructure allows businesses and technology professionals to make informed decisions when designing or upgrading facilities. This guide explains important planning considerations, sustainability practices, and infrastructure strategies that contribute to efficient and resilient data center environments.