Green Energy

New tech is almost always more expensive as it is being developed. It becomes more efficient over time as it scales up and as improvements are figured out. You only see the new tech becoming available at the retail level once it's cost has come down to around the same as that of existing solutions (unless there are non-market forces, like governmental policy at play). So the new stuff comes in at the same price, but then has the potential to get cheaper to produce. Of course, unlesss there is an abundance of supply, the retail user won't see a cost reduction (unless there are non-market forces, like governmental policy at play) because the business using the new tech will charge what the market will bear to maximize profits. And the market cost is already established with the old tech.