If the meter is beeping or locked, you may need a specific reset code from your utility company. Generic codes typically won't work.

Siemens Cashpower 2000 refers to a legacy series of prepaid electricity meters and monitoring systems designed to help consumers and utilities manage energy consumption through a secure token-based system

If you need a "code generator" for legitimate reasons (e.g., you are a landlord or a micro-utility reseller), there is a legal path.

This is usually installed outside the home. It measures energy use and has a load-switch relay. The relay cuts off power when credit runs out.

Remember: Electricity is a commodity, not a puzzle. The only reliable “generator” is the one connected to your utility’s billing system – and that one always requires payment.