Determining if a neighbor is illegally stealing electricity needs to be done carefully to avoid legal and ethical issues. If you have reasonable grounds to suspect, you may consider the following methods: 1. **Watch the meter:** If you live in an area where you can access the meter, watch the meter readings for unusual changes. If possible, record your meter readings regularly and watch for sudden increases. 2. **Monitor electrical appliances:** Turn off all electrical appliances in your home and check to see if the meter is still turning. If the meter continues to turn, there may be unusual electricity usage. 3. **Check the wires:** Check the wires from the meter to your home to see if there are any suspicious connections or branch wires. 4. **Consult a professional:** Have a qualified electrician inspect your home's electrical system and look for unusual or unauthorized connections. 5. **Use a smart meter:** If possible, install a smart meter, which can provide more detailed information on electricity usage and help identify anomalies. 6. **Communicate with the power company:** If you suspect electricity theft, contact the power supply company, who have the tools and experience to investigate and resolve such issues. Most importantly, ensure your own safety during any investigation and follow the law. If electricity theft is indeed discovered, it should be handled by professionals and relevant agencies rather than confronting the suspects directly yourself.