A reliable and cost-effective wireless telemetry system using the electromagnetic waves for the real-time subsurface monitoring (e.g. CO2 sequestration) is developed. An array of toroidal transceivers are deployed winding around the highly conductive casing string for wireless data transfer between surface and deep subsurface, and energized casing technique is utilized to charge the toroidal transceivers and subsurface sensors. This novel wireless telemetry system will help to maintain well integrity and reduce potential leakage by eliminating the needs for perforated casing or an umbilical in the cement annulus since no direct path of fluid (e.g. oil and gas, underground water, CO2) leakage is induced by this wireless system. This approach has two elements. First, develop a reliable and cost-effective wireless telemetry system for real-time data transmission of meaningful measurements from deep subsurface to surface, and from the surface to deep subsurface. Second, develop a wireless power transfer system to charge the downhole antennas and subsurface sensors using energized casing. This system can also be used to operate downhole well equipment including sensing, control, and telemetry devices.