Smart Energy Technologies & Energy Storage
2018 saw continued build-out of hybrid solar + storage projects at all size scales (residential, C&I, utility), and 2019 is expected to see additional growth with the filing of FERC 841 compliance plans and continued storage density improvements and cost declines. SEIA cites NREL analysis which notes the increasing Benefit/Cost ratio for solar + storage deployments as the generation of solar electricity on the grid grows from 15% - 24% in 2020. NREL’s work notes the sensitivity of the Benefit/Cost ratio to the system architecture, with DC-DC coupling representing the highest Benefit/Cost ratio at high (24%) solar penetration rates. While FERC 841 is seen as a watershed development for the storage industry, the Energy Storage Association (ESA) has noted barriers to scale-up exist in some of the ISO and RTO filings. DNV GL’s perspective includes insight into the influence of state of charge (SOC), SOC swing, C-rate, and temperature on battery performance across different materials platforms. In a supply-constrained environment for common chemistries, such as NMC, matching equipment selection to use case (for example, TOU markets, demand charge management, frequency regulation) is critical for optimizing financial return. DNV GL will provide leading edge technical due diligence observations for hybrid solar + storage projects, focusing on key items pertinent for revenue forecasting and O&M cost modeling and management. Case examples will be drawn from DNV GL’s project diligence experience. Insights will be provided from solar + storage energy modeling as well as battery replacement modeling which incorporates highly accelerated life cycle testing results. Major design strategies regarding BESS sizing and control system considerations for utility-scale projects and distributed portfolios will be highlighted. Cost management strategies enabled by energy storage system monitoring will also be discussed.