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Solar power equipment has fallen in price steadily over recent years as human ingenuity finds better and more efficient ways to manufacture solar panels, and the associated equipment, invertors, racking and connectors. In 1977 you needed $77 to buy a single Watt of solar panel. Today that price is less than $0.50. This is just the solar panel price. Balance of plant (BOP) is the wiring, invertors, grid connection, sub stations and labor. Those costs have been coming down as well but not quite as fast. As the total price per Watt has fallen, against a backdrop of rising power prices, margins have expanded. We now stand at a time when, in many locations, islands and some towns and even countries, the electricity price is high enough that no subsidies are required for renewable sources of energy to be competitive. This is called "Grid Parity" and every year, it is a larger territory.