Preheat oven to 325º F. Prepare a loaf pan with butter or shortening and lightly flouring. Set aside. Cream together coconut oil and sugars until well combined. Add eggs one at a time, making sure well combined before adding the next. Add flour, cocoa powder, salt, baking soda, baking powder, and espresso powder and slowly combine with egg mixture. Stir in grated zucchini, vanilla and chocolate chips, if using.