To add evidence to this, when you query the API, the following values are visible for the operation mode:
{
"real_mode": "autonomous",
"backup_reserve_percent": 33.5,
"freq_shift_load_shed_soe": 90,
"freq_shift_load_shed_delta_f": -0.32
}
The "freq_shift_load_shed_soe" changes when you change...