Many residents on Saturday were wondering why there were helicopters hovering over their homes.

Those helicopters are part of Baltimore Gas & Electric Company’s annual power line inspection, per Baltimore County Councilman David Marks.

The helicopter was primarily spotted near the Seven Courts area on Saturday.

From BGE: “BGE will be using a utility helicopter contractor (see photo depicting the type of helicopter to be used) to perform work on BGE electric transmission equipment, to include towers, poles and wires. Area residents and motorists may see the helicopter hovering near transmission power lines or following a flight path along electric transmission rights of way. The helicopter may be seen hovering over individual transmission lines for several minutes before moving to additional equipment. BGE is working to minimize disruption from the helicopter. Motorists and passersby are advised to use caution in the vicinity of the work and maintain focus on traffic.”

BGE will soon begin testing drones to inspect overhead power lines, according to the Baltimore Sun.

Meanwhile, BGE is encouraging customers to power down for Earth Hour between 8:30 and 9:30 p.m. ET on Saturday, March 24th.