The federal grant notice titled "Grid-free Renewable Energy Enabling New Ways to Economical Liquids and Long-term Storage (GREENWELLS)" is being offered by the Advanced Research Projects Agency Energy (ARPA-E). The grant aims to develop dynamically operable reactor systems that can produce sustainable carbon-containing liquids from renewable energy and carbon dioxide (CO2). These liquids can be used as cost-effective energy carriers for long- and medium-term energy storage and can potentially address imbalances of supply and demand in a high renewable penetration scenario. Additionally, the grant seeks to find technological solutions for lowering emissions in transportation sectors such as aviation, marine, and heavy-duty vehicles. The program expects chemical reactors and supporting units to economically store at least 50% of intermittent electrical energy in carbon-containing liquids. Various technical process approaches, including thermal, electrochemical, plasmonic, photonic, and biological, are expected to be explored. The integration of novel and known processes in a dynamic system will be necessary. Successful projects under this grant will provide low-cost carbon-containing liquids that enable the transportation and storage of renewable energy, are suitable for use in difficult-to-decarbonize sectors, and alleviate the need for connection to an electric grid. The grant has an estimated total program funding of $38,000,000, with an award ceiling of $5,000,000 and an award floor of $1,000,000. The expected number of awards is 15. The deadline for submissions is April 18, 2024, at 9:30 a.m. Eastern Time. For more information and to apply, interested applicants should visit the ARPA-E eXCHANGE website at https://arpa-e-foa.energy.gov.