In the maritime industry, the need for sustainability, lower emissions, and energy independence is growing. Simultaneously, limited grid capacity at shipyards, ports, and berths creates operational bottlenecks. Battery storage for shipping offers a strategic solution: it enhances energy security, enables emission-free sailing, and creates room for growth. A board network battery or onboard battery can store energy and deploy it during peak moments, such as when propulsion or onboard systems are activated. With a battery for an electrical ship or hybrid ship, peak consumption is smoothed out while ship energy storage is charged during quiet periods or via shore power. This reduces the pressure on the infrastructure, especially at berth facilities or charging infrastructure in the port. Even in new builds or retrofitting of a ship, maritime battery storage provides a solution. Whether it's a battery for inland shipping, tugboat, ferry, patrol boat, or inspection vessel – any vessel with electric or hybrid propulsion benefits from its own battery with maritime EMS for smart control and energy balance. For shipyards and shipping companies, battery storage is also a way to make both shore power facilities and fleet management more sustainable. On location – for example at a port authority – a battery storage shore power installation can serve as a grid buffer, to absorb temporary peaks or supply ships with power without overloading the grid. This makes port authority energy storage a building block for reliable, clean port infrastructure. Battery for emission-free sailing is no longer just a future vision. By deploying a flexible and scalable battery solution, not only is a more stable energy supply on board created, but it also opens doors to new revenue models, lower operational costs, and an advantage in regulations and tenders.