Power plants need dependable import substitutes for non-contact linear displacement sensors used in turbine valves, dampers, feedwater pumps, and generator monitoring. Imported models often bring long lead times, high lifecycle costs, and supply-chain risks. Domestic alternatives are now engineered for harsh duty, including high temperature, steam, vibration, electromagnetic interference, and continuous operation. Eddy-current and laser sensors deliver micron-level resolution without mechanical wear, making them suitable for critical position feedback. When selecting a replacement, engineers should compare stroke range, linearity, repeatability, temperature drift, IP rating, output signals, and DCS/PLC compatibility. Local suppliers can provide customized probes, stainless-steel housings, shielded cables, fast calibration, and spare-parts support. A practical retrofit plan includes dimensional verification, signal matching, zero/span calibration, vibration testing, thermal stability checks, and long-term drift monitoring. These sensors also support predictive maintenance by giving stable feedback for control loops, reducing unexpected outages and manual inspection. Successful import substitution cuts procurement time, reduces inventory costs, improves maintenance response, and strengthens power supply security. With proven accuracy and local service, domestic non-contact linear displacement sensors are becoming a reliable choice for thermal, hydro, and nuclear power plants. Suppliers should offer traceable calibration reports, EMC test data, and long-term warranty. Pilot installations help verify performance under real load cycles before full replacement. By combining robust sensor design with responsive local engineering, plants can replace imported units without compromising safety or measurement accuracy.