I will soon be building a house on Lake Atitlan and I am thinking of whether it would be cost-effective to install solar panels on the roof. What makes solar panels cost effective in the States and elsewhere are the tax rebates and more importantly, the ability to "sell" excess power back to the power company. Now I know that tax rebates are not on the cards in Guatemala, but I was wondering if the power utilities buy back power? This is basically where you revolving meter dial starts going the other way and your meter numbers start declining. Anyone know?