BESS PORTFOLIO
Wood County Battery Energy Storage System
Wood County, WI
SPECIFICATIONS
LOCATION
Wood County
CLIENT
Alliant Energy
GC
J.P. Cullen
CONTRACT AMOUNT
$5.6M
Project Schedule
3/30/24 – 2/28/25
Wood County BESS is a 96 battery, 300 MWh installation adjacent to the 150 MW Alliant Energy Wood County Solar Installation and a new substation to receive battery stored power. Stored electricity can support 80,000 residential homes for four hours. Electricity from the BESS is fed into the adjacent substation. Stored energy can then be used to alleviate or lessen sharp power demands in Alliant’s utility grid network. Wood and Grant County are the first large, utility-scale battery storage installations in Wisconsin. The electrical scope of Wood County covers 80% of the project.
Battery Details
- 96 (CATL) (3 MWh) Lithium-ion batteries.
- Each battery weighs 80,000 pounds.
- Ambient temperatures require self-contained heating and cooling.
- Equipped with fire detection and fire suppression.
- Power export generates heat – integrated HVAC system cools/heats.
- Redundant power support from 2nd substation 6 miles away.
Preconstruction
Extensive preconstruction meetings/planning to organize/plan build and develop schedule. Over 40,000’ of PVC conduits are set in compacted sand. Vertical pipe sets were built in prefab, trucked and placed at site using Total Station. 38,000’ of 4/0 copper grounding wire was buried throughout the site.
BIM Layouts
BIM layouts for conduits provide Prefab the opportunity to build, rack and load large amounts of conduits to the site in ready-to-install packages. On-site total station placed the conduit racks in the exact location. Changes were made, but these were due to engineering gaps and inaccurate equipment drawings.
Construction
The site was bath-tubbed. Sand from the site was filtered, replaced and compacted at 8” levels for structural integrity of battery slabs.
- 210,000 feet of cable
- 41,500’ PVC conduit
- 28,000’ 4/0 Ground Wire connected to 10 – 100’ deep wells for effective ground
