The fact is that 10 to 12 per cent of the primary energy supply today comes from renewable sources (not counting hydroelectric energy). But new renewables – technologies of the future – still make up only one or two per cent of this supply. The rest comes from biomass systems of the poor, like the stove that burns wood or cow dung. These are the clients who can now either take the next step on the energy ladder to kerosene or liquefied petroleum gas or jump to the top of the ladder by moving to modern biomass energy sources. These are the same clients who are in the dark, but today they have the option of selecting decentralised mini-grids for their energy needs. But if these are the people who are the targets of the new ventures, then business is completely out of touch with its customers.

Conventional wisdom suggests that because we're approaching the theoretical limit on individual wind turbine efficiency, wind energy is now a mature technology. But California Institute of Technology researchers revisited some of the fundamental assumptions that guided the wind industry for the past 30 years, and now believe that a new approach to wind farm design—one that places wind turbines close together instead of far apart—may provide significant efficiency gains.

This challenges the school of thought that the only remaining advances to come are in developing larger turbines, putting them offshore, and lobbying for government policies favorable to the further penetration of wind power in energy markets.

Some positive news from the oil spill.