Nearly all steam-driven plants, whether it be nuclear, coal, natural-gas, solar thermal, has a condenser sitting behind the steam turbine. Its job is to cool the steam back down into liquid water, pulling more steam through the turbine in the process. The better the heat transfer between the steam and the coolant flowing in the condenser, the more efficient the plant runs. 

DropWise coatings boost the thermal performance of steam surface condensers significantly, resulting in an improvement in the plant "heat rate" (a measure of efficiency). This saves the plant not only on fuel and emissions, but also helps reduce coolant water usage to aid in 316b compliance.