This is 18-year-old Alex Garrow. He is an orphaned teen who lost his parents at a young age in a car accident. He has graduated high school and now fixes roads.
On a trip to Aberdeen, Alex's father loses control of their car after it strikes a pothole. Alex luckily crawls out safely and he discovers loose seeds. Curious, he reaches out to them and feels a sudden burst of energy. Eight years later, he discovers his powers.
Now that Alex has experienced a tragic incident, he realizes the needs of the local roadways. The state refuses to do anything about these roadways, so Alex decides to act while he can.
Light can be used to heat and melt objects in the world. The heat causes an endothermic reaction, creating a physical change.
Using the sun's rays, Alex can superheat rocks to create an asphalt-like substance to fill potholes and patch up other damages on roads.
Alex can also plant his seeds near a road. Once he does, he can collect water particles in the air or from a nearby water source to cause the seeds to sprout faster. These seeds create an extensive underground root system to strengthen the ground above.
For the other superpower, water can be to germinate seeds. In addition, there are water particles in the air.