This whitepaper by NEC and RMI explores innovative energy efficiency technologies and strategies for O-RAN architecture components. It discusses technical descriptions, energy savings, and potential standardization recommendations for various technologies. These strategies are designed to significantly reduce the environmental footprint of O-RAN ALLIANCE Radio Access Networks while maintaining network performance and reliability. By adopting these energy-efficient solutions, the O-RAN community can lead the way in creating a more sustainable and cost-effective telecommunications network.