Frontier has facilitated offtake agreements with Planetary, a company that removes atmospheric CO₂ and reduces local ocean acidity by adding dissolved alkaline minerals to seawater. With this deal, Planetary is expanding on the pilot project that recently delivered the world’s first verified OAE tons, and initiating the next phase of operation with deliveries starting in 2026. Frontier buyers will pay Planetary $31.3 million to remove 115,211 tons of CO₂ between 2026 and 2030.
Ocean alkalinity enhancement (OAE), particularly through approaches like alkaline mineral addition, has the potential to remove several billion tons of CO₂ with a credible path to under $100 per ton. Frontier has supported the deployment of alkaline materials across a range of environments to help clarify the efficacy, scalability and safety of each approach: on land (Lithos, Eion, Terradot), in freshwater systems like rivers and wastewater treatment (CarbonRun, CREW), and now in a coastal environment with Planetary.
Planetary’s process involves careful addition of dissolved alkaline minerals, such as calcium oxide (CaO) or magnesium oxide (MgO), into coastal surface waters. This process boosts the ocean’s natural ability to drawdown carbon by converting dissolved CO₂ into stable bicarbonate ions, which are durably stored in the ocean for over 10,000 years. They use existing coastal facilities—like power plant cooling water outfalls—to ensure quick and effective integration without the need for massive new infrastructure investment. Unlike biological approaches, OAE works through the ocean’s chemical buffering system, avoiding disruption to biological carbon cycling and food webs.
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