The benchmarks in this report are bottom-up cost estimatesof all major inputs to PV and energy storage system installations. Bottom-up costs are based on national averages and do not necessarily represent typical costs in all local markets. Are solar photovoltaic system and energy storage cost. This report is available at no cost from the National Renewable Energy Laboratory (NREL) at www. Ramasamy, Vignesh, Jarett Zuboy, Michael Woodhouse, Eric O'Shaughnessy, David Feldman, Jal Desai, Andy Walker, Robert Margolis, and Paul Basore. Whether you're planning a renewable energy project or need backup power solutions, this guide breaks down cost factors, regional variations, and actionable tips to optimize your budget. 8 billion in 2021, and is projected to reach $20.