that is also why the government is pushing for Tidal. for as long as there is a moon, then the deeper portions of the Philippines, i.e. Surigao Straits, San Bernardino Straits, etc., could be harnessed continuously. think of wind turbines, just under water.
and only few sites capable of hosting geo is not true. for every kilometer you go down, the temperature rises dramatically. there are boreholes in California that have been sunk to 5kilometers that, when loaded with water, generate enough steam to run 150Mwhs of electricity.
@ c_d- are you not paying through the nose as it is? a single kilowatt hour of electricity from a diesel generator will put your back by Php12! how much do you think it costs to put up a single Megawatt of power from Geothermal? Hydro? Wind? each of those i named will cost 2-4 times the amount of money spent on diesel or coal, but are you willing to swelter in more global warming? how about the current price of diesel?
problem is, we all want what is good for the country, but few are willing to take the sacrifice needed.......