Voya Energy announced a $35 million financing round in August 2026 for electrochemical generators that produce electricity from prepared scrap aluminum, air and water without combustion. The company targets data centre applications, initially focusing on replacing diesel backup power systems where noise, exhaust and permitting present obstacles. The technology also envisions larger installations providing continuous grid power at capacity-constrained locations.
Aluminum-air cells operate through a one-way chemical reaction where aluminum combines with oxygen and water to generate electrical energy while producing aluminum hydroxide as a byproduct. Unlike rechargeable batteries, these generators consume their metal fuel and require continuous replenishment. The process also generates substantial quantities of spent material that must be collected, transported and either recovered or sold into alternative markets. The upstream electricity used to refine aluminum from ore represents an additional energy cost requiring consideration in overall efficiency calculations.
For a hypothetical 100 megawatt data centre operating continuously on aluminum-air generation, calculations indicate approximately 190,000 tons of incoming metal and 550,000 tons of outgoing byproduct annually. These material flows create significant logistical and economic considerations for fuel delivery and residue management. The scale of these requirements differs substantially between intermittent backup applications and continuous power generation, affecting the viability of different business models.
Voya targets electricity costs below $0.30 per kilowatt-hour and metal fuel at $0.50 per pound, with aluminum accounting for roughly $0.24/kWh before accounting for preparation, transport, residue handling or capital costs. The company plans initially to sell aluminum hydroxide byproduct, with metal regeneration as a longer-term option. Lifecycle assessments of regeneration pathways suggest round-trip efficiency of 29-35%, indicating substantial additional processing requirements.
Specialists note potential applications for compact noncombustion backup where diesel faces permitting difficulties and suitable scrap supply exists locally. However, continuous power deployment for large data centre operators requires broader economic comparison against grid connections and rechargeable battery alternatives. The underlying electrochemistry remains established, but competitive deployment hinges on demonstrating viable material supply chains and managing the economics of every metal delivery and residue removal cycle.
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