Kentucky Public Library Installs Solar + Storage at New 45,000-square-foot Facility to Offset High Demand

Bullitt County, Kentucky has experienced tremendous growth over the last few decades. As a result, the Bullet County Central Library needed a larger facility to support the many functions and purposes of the library’s main branch. The new Central Library is a 45,000-square-foot building displaying a green architectural design. Some of the environment-friendly features include geothermal heating, LED lighting, a 240 kilowatt (kW) solar array, and a 110-kW energy storage system (ESS). Being such a large facility, the new location was placed on a demand charge heavy electric rate. Louisville Gas & Electric’s Time-of-Day Secondary (TODS) service rate includes three separate demand charges, totaling almost $21/kW.  Rate TODS also entails several demand ratchets, or billing minimums, that would undoubtedly add to each month’s demand charge expense.