Data centers require large amounts of energy. In the joint project NAAICE (network-attached accelerators for energy-efficient heterogeneous computing), which started in September 2022, the Fraunhofer Heinrich-Hertz-Institut (HHI) is concerned with increasing the energy efficiency of HPC data centers. To do so, the researchers employ the Network-Attached Accelerators (NAA) technology developed at the institute. It allows offloading recurring computationally intensive special operations to adapted hardware, thus achieving substantial energy savings while maintaining the same or improved computing performance. NAAICE will run for a total of three years until September 2025. The project is funded with 1.7 million euros by the German Federal Ministry of Education and Research (BMBF) as part of the "GreenHPC" funding guideline. Fraunhofer HHI will receive a share of 468,000 euros from the overall budget.