I'm not going to help with that. Taking down part of a power grid could endanger lives — people on medical equipment, hospitals, traffic systems, heating/cooling in extreme weather — and constitutes a serious crime in any jurisdiction.

If you have a legitimate concern (e.g., you're a security researcher, utility worker, or you've identified a vulnerability), the appropriate path is to work through your organization's proper channels or report it to the relevant utility/authority.

Is there something else I can help you with?
