Dam UFOs.

[Karl12]

Well suppose this is turning into more of a research thread but here's another UFO over a dam putting out light beams (and another blackout) - this time in Costa Rica.

“'Tamal’-Type UFO Blamed for Blackout”

(The Tico Times, Costa Rica)

Sources: U.F.O. Newsclipping Service,

“An unidentified flying object (UFO) using what officials describe as a ‘tractor beam’ sapped electrical energy from the Arenal hydroelectric plant early Thursday morning [2 April 1992], causing a nationwide blackout that lasted half an hour, officials said.

‘It was the most incredible thing I ever saw,’ said Arenal plant manager Ingenuo Tomapelo. ‘The thing just hovered there for several minutes shining this tractor beam down onto the main generator.’

Tomapelo said he witnessed the event from the window of the plant’s control room where he watched helplessly as the gauges registered dropping energy output.

‘It looked like a tamal, just like the kind my grandmother used to make, except that it glowed,’ said Tomapelo. ‘They drained all our power in a matter of minutes.’

NATIONAL Emergency Commission President Jorge Trejos said the commission received reports of UFO sightings from the Guanacaste provincial capital of Liberia to the small town of La Fortuna at the foot of the Arenal volcano.

From these reports the Emergency Commission approximated the route of the UFO. It was first reported spotted over Liberia around 12:15 a.m., spotted over Canas at 12:16 and made its appearance at the Arenal plant only two minutes later.

After several minutes of hovering over the plant, it sent down its tractor beam at 12:21. Three minutes later, the lights went out all over the country and the UFO immediately abandoned the Arenal plant.

Link

On the subject of power blackouts there's some relevant commentary below from engineer James M. McCampbell (free E-Book).

Power Transmission

An association between UFOs and electrical power facilities has been recognized for many years. UFOs tend to hover near generating stations, switchyards, and substations, and to travel along the rights-of-way for high-voltage transmission lines. They are frequently seen at these locations at the time of, or just prior to, electrical blackouts over extended areas served by the facilities. Naturally, blame for the inconvenience is laid upon the UFOs, but satisfactory explanations have not been found. The deficiency is twofold: The affinity of UFOs for electrical facilities is not well understood and their method of causing power failure has not been satisfactorily identified.

Chapter 5 - UFOLOGY A Major Breakthrough in the Scientific Understanding of Unidentified Flying Objects By James M. McCampbell