Energy meters have an important role in electricity transactions between providers and consumers. Therefore, the reliability of kWh meters is essential to ensure fairness transactions and consumer trust in providers. The research titled “Analysis of the Influence of High Temperature and Humidity on the Performance of Prepaid (Electronic) Single-Phase Energy Meters” has the objective of determine the impact of high temperature and humidity (85°C and 95%) on the physical components, LCD display, and measurement accuracy of single-Phase prepaid energy meters. The research method is an experimental study, involving testing three brands of single-Phase prepaid energy meters (brands A, B, and C) with 50 samples for each brand and a testing duration of 60 days. The research location is at the Low Voltage Laboratory of PT PLN (Persero) Pusat Sertifikasi, South Jakarta. Data analysis was conducted by comparing samples before and after testing using a paired samples t-test. After completing the test and finish the data analysis, significant changes were found in the measurement accuracy of all three brands of samples. However, no significant differences were observed in physical condition and LCD.