Support of Battery Energy Storage Systems with Helical Pile Foundations-Paper

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The paper examines the design and use of helical pile foundations for battery energy storage system (BESS) facilities, presenting two project case histories. Helical piles offer rapid installation, quality control through torque measurements, low site disturbance, and the potential for removal and reuse. They are commonly used to support battery containers and transformers, with lateral loads often governing shaft size.<br /><br />Design begins by assessing site conditions and developing pile layouts and loads, including wind, snow, and seismic effects. Shallow bedrock may make helical piles unsuitable, while site grading and cut-and-fill conditions can significantly affect design. Engineers evaluate lateral behavior and axial bearing capacity, then use soil data and statistical analysis to select pile configurations that meet required capacities without exceeding shaft torque limits.<br /><br />The authors recommend field installation testing before production. Test piles installed across the site help verify required torque and depth, reveal ground variability, refine pile lengths and helix sizes, and improve installation procedures and safety. Accurate surveying and accounting for final grades are important to reliable test results.<br /><br />In Pecos County, Texas, testing allowed the proposed pile length to be reduced from 10 to 9 feet and the helix area to be decreased. In Lowndes County, Mississippi, testing established different target lengths for two site areas: 12 feet in Area A and 10 feet in Area B.<br /><br />The authors conclude that helical piles can provide an efficient, economical foundation solution for large BESS projects. Statistical design and site-wide test installation programs are particularly valuable for managing subsurface variability and optimizing construction.

Keywords

helical piles

battery energy storage system

BESS foundations

foundation design

lateral loads

axial bearing capacity

torque measurements

field installation testing

subsurface variability

project case histories