GetCurrentPowerPolicies

[DllImport("powrprof.dll", SetLastError = true)]
public static extern bool GetCurrentPowerPolicies(
   ref SYSTEM_POWER_POLICY pGlobalPowerPolicy,
   ref SYSTEM_POWER_POLICY pPowerPolicyAc,
   ref SYSTEM_POWER_POLICY pPowerPolicyDc
);

Microsoft documentation: Link