BESSi™ is the Battery Performance Intelligence platform for grid-scale BESS fleets. It predicts PJM regulation revenue hours ahead, validates every Performance Score independently, and explains each number it produces — from a permanent historian you own, on a read-only platform that never touches your controls.
Request a fleet walkthroughA 30-minute look at your own use case. Live dashboards, not slideware.
Regulation revenue forecasts at 1-, 4-, and 24-hour horizons, anchored to the clearing prices and PJM Manual 12 Performance Score methodology the market uses to pay you — with every derate converted to revenue at risk.
A permanent record in your own cloud tenant, beyond OEM retention windows. Degradation, capacity demonstrations, and settlement disputes are answerable from data you own.
No BESSi component writes to a BMS, inverter, HVAC, or market portal. Safe beside any OEM stack, with per-string health, forensic root cause, and audit-grade compliance evidence.
No black-box KPIs. Every prediction ships with its contributing variables, a confidence score, per-feature attribution, and plain-language operational reasoning.
BESSi is owned by V20 Energy, a PJM frequency-regulation fleet operator, and was proved on its own fleet — four sites, 89 containers. It is developed and operated by Medullus Systems' energy practice, the integrators who wire the sites and watch the fleet overnight.
V20 Energy
Developed by
If you own or operate a grid-scale battery fleet, we would like to show you what BESSi sees in one. Email connect@medullus.com or call (732) 800-6030.