; (5) unmineable coal seams; (6) deep saline formations; (7) deep geologic systems that may be used as engineered reservoirs to extract economical quantities of brine from geothermal resources of low permeability or porosity; and (8) deep geologic systems containing in situ carbon dioxide mineralization formations. (c) Regional carbon sequestration partnerships (1) In general The Secretary shall carry out large-scale carbon sequestration demonstrations for geologic containment of carbon dioxide to collect and validate information on the cost and feasibility of commercial deployment of technologies for the geologic containment of carbon dioxide. The Secretary may fund new demonstrations or expand the work completed at one or more of the existing regional carbon sequestration partnerships. (2) Demonstration components Each demonstration described in paragraph (1) shall include longitudinal tests involving carbon dioxide injection and monitoring, mitigation, and verification operations. (3) Clearinghouse The National Energy Technology Laboratory shall act as a clearinghouse of shared information and resources for the regional carbon sequestration partnerships and any new demonstrations funded under this section. (4) Report Not later than 1 year after the date of enactment of the Fossil Energy Research and Development Act of 2018 , the Secretary shall provide to the Committee on Science, Space, and Technology of the House of Representatives and the Committee on Energy and Natural Resources of the Senate a report that— (A) assesses the progress of all regional carbon sequestration partnerships; (B) identifies the remaining challenges in achieving carbon sequestration that is reliable and safe for the environment and public health