The Department of Energy's Office of Electricity has released a report titled 'Achieving the Promise of Low-Cost Long Duration Energy Storage,' which outlines a roadmap to drive down the costs of emerging long duration energy storage technologies. This initiative is part of the Office's efforts to support the Long Duration Storage Shot, aiming for a levelized cost of storage of $0.05/kWh. The report synthesizes the findings of the 2023 Long Duration Storage Shot Technology Strategy Assessments, identifying pathways to achieve the Storage Shot for 10 promising long duration energy storage technologies. The report describes 10 Long Duration Energy Storage (LDES) technologies spanning electrochemical, chemical, mechanical, and thermal energy storage families. It highlights potential innovations for each technology, such as novel active electrolytes for flow batteries and hydrogen carrier advancements for chemical energy storage. The identified innovations show promise in achieving the Long Duration Energy Shot cost goals, with the top 10% of innovation portfolios capable of reducing costs significantly across LDES technologies. The average implementation cost of these innovations ranges from $100 million to $1 billion over 6 to 11 years. This report underscores the exciting opportunities in energy storage, emphasizing the importance of ensuring access to reliable, resilient, secure, and affordable energy for American homes and businesses while sustaining global leadership in clean energy transformation.