engineered
(1) Engineered When referring to enhanced geothermal systems, the term “engineered” means designed to access subsurface heat, including stimulation and nonstimulation technologies to address one or more of the following issues: (A) Lack of effective permeability, porosity or open fracture connectivity within the heat reservoir. (B) Insufficient contained geofluid in the heat reservoir. (C) A low average geothermal gradient which necessitates deeper drilling, or the use of alternative heat sources or heat generation processes.