BESS: An 800V DC Redemption Story
Nvidia $NVDA is transforming data centers from passive power consumers into active energy factories. The 2027 Vera Rubin roadmap introduces a native 800VDC power architecture. This design places Battery Energy Storage Systems (BESS) as a requirement in 2027+ future AI factories. Previous architectures used BESS primarily for emergency backup. The Rubin platform requires integrated storage to manage the massive and sudden power spikes of agentic AI.
Two pure-play storage companies have a distinct advantage in this infrastructure shift. Fluence Energy $FLNC and Eos Energy Enterprises $EOSE offer specialized technologies for these new requirements. Both companies also generate sticky, high margin software revenue that scales as they deploy more units.
Fluence Energy ($2.5B MC)
$FLNC focuses on high-speed lithium-ion systems. Their Smartstack architecture provides the sub-second response times needed to stabilize GPU workloads. Fluence is the dominant choice for short-duration power shaving in liquid-cooled environments. The mid-point of their $3.4B revenue is 100% covered by orders. Fluence is currently in a margin trough and has a real road to achieving high single digit EBITDA margins for FY2027.
Eos Energy ($2.6B MC)
$EOSE specializes in long-duration zinc batteries. Their Znyth chemistry is non-flammable and requires no active cooling. This makes Eos the safest choice for dense AI campuses where fire risk limits lithium-ion density. Their technology supports the on-site power generation required for grid-independent AI factories. Management dropped the ball in 2025, but their Q1 preliminary results came in-line with estimates and margin guidance was re-affirmed. This is step 1 of management earning back faith of the capital markets.
Fluence and Eos optimize their hardware specifically for 800VDC native discharge. This technical focus ensures higher efficiency and reliability for the next generation of AI infrastructure.