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With new appliances now offered by several British firms, many distant places could be lit with solar-powered street lights. The solar panel produces electricity which charges a battery. When the sun goes down, the battery power is then used for lighting. Each lamp has its own panel so the system can be used for one individual light or a number of them. The solar panels provide power during the day and charge batteries which accumulate enough power to light the tunnel at night. There is one more advantage of solar power: not only it is unlimited, but also its use does not pollute the environment. That is why it is very important to develop devices which make it possible to transform solar power into mechanical or electric forms of power.