Aug. 8. Duke Energy sirens in Mecklenburg County will be tested as part of new hardware installations. Sirens are expected to sound for three minutes only, but may be sounded several times as testing progresses. No public action is necessary. This test is being conducted in cooperation with the State of North Carolina and Mecklenburg County Emergency Management. This test is in addition to the normal siren tests listed in the 2016 McGuire Emergency Planning Calendar.  Questions? Call the EnergyExplorium at 980-875-5600.