Hot dry rock schemes have been around for a while (apparently dating back to a project in 1970 in Los Alamos NM), but for it to work it seems you need some spec

Hot dry rock schemes have been around for a while (apparently dating back to a project in 1970 in Los Alamos NM), but for it to work it seems you need some specific rock types. For example, one project only recovered 3% of the injected water due to losses into fractures. Here's a historical overview: https://www.sciencedirect.com/topics/engineering/hot-dry-rock https://www.sciencedirect.com/topics/engineering/hot-dry-roc...