The exponential growth in artificial intelligence (AI) has led to a substantial increase in power demand for data centers, driving a shift towards sustainable energy solutions. Major players in the data center industry, including Amazon, Microsoft, Meta, and Google, are actively investing in cutting-edge energy technologies to align with their ambitious sustainability goals. Companies are increasingly turning towards renewable energy sources like wind and solar power, which have now become competitive with fossil fuels due to significant funding and advancements in the sector. IDTechEx's report on sustainability for data centers highlights the surge in investment in emerging energy solutions such as small modular nuclear reactors, hydrogen and fuel cells, enhanced geothermal systems, and grid-scale Li-ion batteries within the data center space. These technologies offer a solution to the intermittency of wind and solar power, aiming to meet the demand for continuous power generation without carbon emissions. The report forecasts substantial savings of US$150 billion by 2035 for the data center sector through the adoption of low-carbon energy sources, compared to a fossil fuel-oriented scenario. Technologies like small modular nuclear reactors, fuel cells, enhanced geothermal, and Li-ion batteries play a crucial role in this transition, offering cost-effective and sustainable energy solutions for data centers. Notable advancements include the development of small modular nuclear reactors, which promise reduced costs and construction times, and the adoption of hydrogen and fuel cells for continuous power generation. Enhanced geothermal technologies are also being explored to expand the reach of geothermal power, while grid-scale Li-ion batteries are enhancing energy storage capabilities for solar and wind power integration. Overall, the data center industry's focus on carbon-free energy solutions signifies a positive step towards achieving grid decarbonization and long-term energy sustainability.