In a small bowl, whisk together the espresso powder and water until dissolved. If necessary, add 1 tsp more water to dissolve completely. Set aside.
In a large mixing bowl cream together butter, oil, espresso, and sugars until light and fluffy.
Add eggs, vanilla, and salt and mix well until combined.
Add in the baking soda and flour and mix well.
Stir in chocolate chips.
Drop dough by 3 TBS scoops onto ungreased cookie sheets (I like to line mine with a silicone baking mat) 2" apart. Bake for 10 minutes.
Allow cookies to cool on the baking sheet at least 5 minutes before transferring them to cooling racks to cool completely. Store in an airtight container at room temperature.