New Zealand leads the world in zero emission renewable grid electricity now at 85%. (WK-intern) - With a nice balance between geothermal, hydroelectric, unusually continuous wind power and some solar, the country has less intermittency of green power than most. Next comes devolution of these sources to off-grid supply on buildings and even on land, water and airborne vehicles. For example, a 20-person solar boat was recently launched with a "perpetual" six knot speed, that can power three houses on arrival. The technology comes from Naval DC in the Netherlands which presents at the world's first conference on the subject, "Energy Independent Electric