That thing does even many expats wrong. The cities and town north of Dumaguete seems to have more reliable power distribution. Never experienced any non scheduled blackout.
I was referring to how the locals in the area call them "pedicabs" when they are not actually pedicabs. Pedicabs are powered by rice, not gasoline. Only place in the Philippines I've been that refers to Trikes as pedicabs. Makes sense. I remember the national highway going north being improved before the one going south was. The electrical infrastructure might have grown along with the highway infrastructure. (That's is just an opinion/guess though, I have no idea if that is true.)
I went to google maps satellite view, simple enough to find the geothermal plants past Ocean24, can not find the high voltage power lines feeding anywhere. In the US (yes I know this is not the US), they can be identified fairly easily by the straight clear cut lines. Follow the clear cut and count poles if you want. I am more blind than I thought or they are invisible. I wanted to follow the direction they went to see if they headed to the north side of Duma. No joy...
There is a chance that the Geothermal plant may not provide much (if any) power to the area. The power could be purchased by another distributor. I remember living about an hour from a coal power-plant in the US, the power for it was routed to another state over 200+ miles away. Like you said, this isn't the US, but I have heard before that the power produced in Valencia is not used in the area. Though if that is the case it is a bit strange that NORECO used to offer a discount on the electrical bill to residents of Valencia. Could it also be possible that the power lines were buried? I really don't know sh*t about power distribution or infrastructure at the industrial level, I'm sure my ignorance on the topic is showing here.
Yes but highly unlikely because an order of magnitude higher costs and in a seismically active area very stupid. There are a few plants up there and I looked around all of them. The only thing I can think of is based on the large unscheduled blackout last year where the property owner held the whole area hostage for right of way payment before letting the electric company in to clear and repair the lines. It is possible I can't see the lines because they are all overgrown, another dangerous problem waiting to happen.
The power lines are up there if you look visually,not on google,a couple of places you can see them is pulangbato falls and always wondered how they got them up there! Another place is azalea resto on the way up to twin lakes,they run right over the mountains to amlan wjere they go under the tanon straight to cebu.
If you head up the road to Twin Lakes you will see some huge high voltage lines that I believe link the geothermal plant to the Bacolod transmission line. I cannot find it on a map but thats where Wiki says it goes WikiProject Power networks/Philippines - OpenStreetMap Wiki
Power from all power plants goes into the national grid, and is dispersed from there. Teh power from valencia crosses teh tanon strtaight at amlan to ginatlan cebu. here is a pic taken off google of the pwer lines at ginatilan; Edit; looking closer at google earth, ginatilan is too far north to cross to Amlan, I'm not sure where the negros side lands.