Reports Published Author Tags Share Talk to an Expert Published Author Tags Share Talk to an Expert Page Content Higher natural gas prices may spur interest in alternatives to natural gas-fired systems as a means of integrating renewable resources in the grid. One option - direct injection carbon engine (DICE) - is undergoing testing and could provide efficiency, emissions, and cost benefits. Surveillance Article: A Direct Injection Carbon Engine (DICE) Using a Coal Slurry Fuel MORE FROM NRECA