Driven by state mandates for carbon-free power and emission reduction targets, renewable resources such as wind and solar have gained significant traction in the market. With the rapid proliferation of renewables, there will be a need for large scale, long duration energy storage to fill the gap when these resources are not operational. While electric vehicles have vaulted lithium-ion technology to the forefront of the industry for shorter durations, there are challenges when you scale these systems to longer duration applications. Flow batteries and other technologies, both new and old, are competing for space in a rapidly dynamic long duration storage market. This presentation will cover long-duration technologies that are commercial or in the development process but near commercial. We will discuss why long duration is required, market drivers, technology status, applications, implementation, and design considerations. Some of the technologies that will be covered include flow batteries, pumped hydro, compressed air, hydrogen, thermal, and mass storage.