The Department of Defense (DoD) is seeking proposals for a solid state power amplifier system for very low frequency (VLF) communication. The objective is to design and demonstrate a 1 megawatt (MW) solid state power amplifier system that can integrate into existing VLF communication equipment. The Navy is interested in replacing obsolete vacuum tube amplifiers with an affordable and reliable system that works in all weather conditions and maintains existing reliability ratings. The system should have redundancy, built-in test capabilities, and the ability to operate automatically or manually. It should also be able to demonstrate 1 MW across the entire VLF frequency range and work with arc and phase monitoring equipment, synchronous tuners, and legacy NATO Interoperable Submarine Broadcast System (NISBS) and Low Band Universal Communications System (LBUCS) outputs. The project will be conducted in three phases: Phase I involves conducting a feasibility study and developing a project plan, Phase II focuses on designing and developing a prototype, and Phase III involves refining the prototype, certifying components, and transitioning the technology for Navy use. The work in Phase II may become classified. The selected contractor must be U.S. owned and operated with no foreign influence and must be able to acquire and maintain a secret level facility and personnel security clearances. The developed technologies may have dual-use applications in other DoD applications and commercial applications such as ground penetrating radar and communication.