Illustrative proposal output. Actual agency requirements.

GridEdge Storage Systems proposes a 36-month research and demonstration program to develop and validate a modular, second-life battery energy storage system (BESS) for deployment at distribution-level substations serving rural cooperative utilities. The proposed system integrates retired electric vehicle battery packs with a proprietary state-of-health management architecture to deliver 4-hour discharge capacity at a capital cost 38% below comparable new-cell installations. This project addresses a critical infrastructure gap identified in the DOE Grid Modernization Initiative: the absence of cost-effective, rapidly deployable storage assets capable of supporting grid resilience in underserved service territories. Phase I will validate cell-level degradation modeling under variable dispatch conditions; Phase II will deploy a 500 kWh pilot system in partnership with a rural electric cooperative in the Southwest Power Pool. The project team combines grid integration expertise from Sandia National Laboratories, battery materials science from the University of New Mexico, and operational deployment experience from a 14-state utility services firm.

1. STATEMENT OF NEED AND TECHNICAL SIGNIFICANCE Distribution-level storage deployment in rural cooperative territories has lagged urban markets by a factor of 6.3 in installed capacity per customer (EIA, 2024). The primary barrier is capital cost: new lithium-ion systems remain above the $280/kWh threshold at which rural utilities can achieve positive net present value under current rate structures. Simultaneously, the accelerating retirement of first-generation EV battery packs—projected at 1.4 million units annually by 2027—presents an underutilized resource stream with residual capacity exceeding 70% of nameplate in a majority of retired cells. 2. PROPOSED TECHNICAL APPROACH GridEdge has developed a hierarchical battery management architecture that addresses the primary technical barrier to second-life deployment: cell-level state-of-health heterogeneity. The system employs three integrated innovations: (a) Adaptive cell grouping: A real-time electrochemical impedance spectroscopy module continuously reassigns cells to parallel strings based on measured internal resistance, preventing accelerated degradation from current imbalance across heterogeneous packs. (b) Predictive dispatch scheduling: A physics-informed neural network trained on 2.3 million cell-hours of field data generates 72-hour discharge forecasts that constrain operation to safe state-of-charge windows, extending effective service life by an estimated 40% relative to conventional BMS approaches. (c) Modular containerized architecture: Each 125 kWh module is designed for single-day installation by a two-person crew using standard utility equipment, eliminating the specialized commissioning requirements that have historically increased soft costs for rural deployments. 3. RESEARCH OBJECTIVES AND MILESTONES Phase I (Months 1–18): Laboratory validation of adaptive cell grouping under accelerated aging protocols representing 10 years of utility dispatch cycles. Target: demonstrate less than 12% capacity fade at end of test sequence, with cell-level variance below 4%. Phase II (Months 19–36): Field deployment of 500 kWh pilot system at a distribution substation serving approximately 1,800 customers in a high-penetration solar territory. Performance targets include 92% round-trip efficiency, 98.5% availability, and documented peak shaving of at least 340 kW during summer demand events. 4. TEAM QUALIFICATIONS The principal investigator holds 14 years of experience in grid-scale storage integration and has led three prior DOE-funded projects totaling $8.2M in federal investment. The project team includes a licensed professional engineer with utility interconnection expertise, two doctoral researchers specializing in battery degradation modeling, and a field operations lead with direct experience commissioning storage systems across 23 utility territories. 5. PATH TO COMMERCIALIZATION GridEdge has executed letters of intent with four rural electric cooperatives representing 94,000 meters. Following successful Phase II demonstration, the company projects initial commercial deployments in Q3 of Year 4, with a target installed base of 18 MW by end of Year 5. The second-life supply chain has been secured through an offtake agreement with a major domestic EV manufacturer covering retired pack volumes through 2031.

Personnel (45%): $675,000 - Principal Investigator (0.6 FTE, 36 months): $216,000 - Co-Investigator, Battery Systems (0.5 FTE): $162,000 - Grid Integration Engineer (1.0 FTE): $144,000 - Research Associate, Electrochemistry (1.0 FTE): $108,000 - Project Manager (0.25 FTE): $45,000 Equipment and Instrumentation (22%): $330,000 - Electrochemical impedance spectroscopy test station: $95,000 - Accelerated aging thermal chamber (4-unit array): $78,000 - Real-time grid simulation hardware (OPAL-RT): $64,000 - 500 kWh pilot system components (Phase II): $93,000 Subcontracts (18%): $270,000 - Sandia National Laboratories — grid integration modeling: $145,000 - University of New Mexico — materials characterization: $85,000 - Southwest Power Pool — interconnection technical support: $40,000 Travel and Field Operations (6%): $90,000 - Phase II site preparation and installation: $52,000 - Technical conferences and DOE program reviews: $22,000 - Utility partner coordination visits: $16,000 Other Direct Costs (9%): $135,000 - Cell procurement for laboratory validation (Phase I): $68,000 - Data acquisition and telemetry infrastructure: $34,000 - Permitting, interconnection fees, and insurance: $33,000 Indirect Costs (F&A Rate: 42%): $630,000 TOTAL PROJECT COST: $2,130,000 DOE Funding Request: $1,500,000 | Cost Share (30%): $630,000

SCIENTIFIC AND TECHNICAL IMPACT This project will generate the first publicly available dataset characterizing second-life battery performance under utility dispatch conditions at scale, filling a critical gap in the literature on grid-integrated storage degradation. Results will be submitted to the Journal of Power Sources and presented at the IEEE Power and Energy Society General Meeting. The adaptive cell grouping methodology, if validated, represents a transferable framework applicable to stationary storage systems beyond the second-life use case. GRID RESILIENCE AND ENERGY EQUITY The 94,000-meter service territory covered by project partners includes communities with average outage durations 2.4 times the national median. Successful deployment of cost-effective storage at distribution substations in these territories directly addresses the DOE's Justice40 commitment by directing clean energy infrastructure investment to underserved rural communities. ENVIRONMENTAL AND CIRCULAR ECONOMY IMPACT By establishing a technically validated pathway for second-life battery deployment, this project contributes to the domestic battery circular economy. Each 125 kWh GridEdge module diverts approximately 1.8 metric tons of battery material from premature recycling streams. At projected commercial scale of 18 MW by Year 5, the program will extend the productive life of battery material equivalent to 260 metric tons of lithium carbonate. WORKFORCE AND ECONOMIC DEVELOPMENT The project will support 12 direct positions across the research team and field operations. Commercial deployment in Year 4 is projected to create 34 permanent positions in manufacturing, installation, and grid operations, with priority hiring commitments to rural communities in the deployment territory. GridEdge has engaged the New Mexico Department of Workforce Solutions to develop a battery technician certification program aligned with project deployment timelines.