Power generators are exploring how they can retrofit coal-fired power plants to enable co-firing with ammonia, part of their strategy to reduce emissions of carbon dioxide (CO2). The latest project to look at the concept is led by Mitsubishi Heavy Industries (MHI), which on Dec. 7 announced it has signed a memorandum of understanding (MOU) with a Chilean independent power producer to begin a feasibility study on ammonia co-firing at a power plant in Chile.