Bloom Energy unveils 800V DC fuel cells for AI data centers

Bloom Energy unveiled an 800V DC-native fuel-cell power architecture on September 16, designed to supply continuous direct current to AI data centers. The solid-oxide fuel cells produce direct current natively, bypassing the need to generate alternating current and convert it later. This approach eliminates intermediate equipment such as transformers and switchgear to reduce energy losses.

The company modeled that the technology can reduce non-compute capital expenditures for a 1 GW data center by $3.6 billion, or 27%, compared to traditional AC-based setups. Bloom also estimated a five-year total cost of ownership reduction of $5.5 billion, or 9%. The firm noted that actual results depend on site design, equipment costs, energy prices, and customer deployment choices.

Bloom highlighted Nvidia's planned rollout of 800V DC architecture starting with its Rubin Ultra and Kyber systems. In its 2026 Mid-Year Data Center Power Report, Bloom reported that data center operators expect direct-current systems to represent 58% of new installations by 2030.

The product rollout follows second-quarter 2026 revenue that surged over 165% year-over-year to surpass $1 billion. For the full year, Bloom raised its revenue guidance to between $3.9 billion and $4.2 billion, representing 100% growth at the midpoint. It had previously guided for 80% growth, up from an initial 60% forecast. Adjusted earnings per share guidance was lifted to a range of $2.55 to $2.85, up from $1.85 to $2.25.

Shares of Bloom Energy have gained almost 170% since the start of 2026. The company faces execution risks if operators do not adopt the technology at scale, or if broader data center power demand slows.