The first price point for usable solar technology that I can find is from the year 1956. At that time, the cost of just one watt of solar photovoltaic capacity was $1,865 (adjusted for inflation and in 2019 prices).10 One watt isn’t much. Today, one single solar panel of the type homeowners put on their roofs produces around 320 watts of power.11 This means that at the price of 1956, one of today’s solar modules would cost $596,800.12

Our World In Data explaining why renewable energy prices have dropped dramatically, showing how solar and wind technologies have become cheaper than fossil fuels within just 15 years.