A ecological pyramid can be made of three different types of data, like the number, biomass, and energy of an ecosystem. In the question is asked for one pyramid of energy. The structure of a pyramid of energy is based on each trophic level of the ecosystem (producers and consumers).
Step 1. Write down the organisms living in the ecosystem.
Producers: Water lilies, Algae, Cyanobacteria, Mosquito fern/fairy moss, Duckweeds, Duck potato;
Primary consumers: Dragonflies, Turtles, Water snail, Earthworms, Pond skater, Newts, Water beetle;
Secundary consumers: Frogs, Mosquitos, Turtles, Fish, Watersnakes, Salamanders;
Terciary consumers: Ducks, Fish, Geese.
Step 2. Pyramid assembly.
It's a common fact between the ecologists that the amount of energy that is passed from trophic levels is about 10% from the previous level. Therefore the energy in the pyramid model of the question must have the numbers presented in the drawing.
