the only problem with Hot rock power is it need geologically sable land mass to be viable (otherwise you have to redrill your wells after every earthquake) which is fine in Australia which is very geologically stable not so good for Japan ect ect.
The only really proven source of base load power not based on fossil fuels is Nuclear. A thorium based nuclear reaction is not self sustaining (therefore no chance of uncontroled meltdown) indeed the gen V reactors (which are still experimental atm as are all thorium based reactors lol) is designed to self distruct in the event the core becomes to hot (essentially the fuel rods melt the conduit supplying the power that causes the nuclear reaction in the first place) since a thorium reaction can only take place with the input of power (in this case a stream of neutrons to cause radioactive decay) if this conduit is cut the reaction stops immediately. I am posting a link that says all this in simple lanuge ... i had a physics friend explain it to me and show me the math but please god don't ask me to find the links lol
http://www.thorium.tv/en/thorium_rea..._reactor_1.php