Another important and enduring contribution made by Armstrong was through his ability to look ahead to the future, especially in relation to the efficient production and use of energy. His preoccupation with this area of concern, along with his pioneering work in the field of hydraulic and hydroelectric power, has resulted in him being a more significant figure than ever today.
During his inaugural address as President of the British Association for the Advancement of Science at its meeting in Newcastle in 1863, he spoke about the issue of finite coal reserves and the energy potential of solar power. This important lecture was reprinted the following year in the volume The Industrial Resources of the Tyne, Wear & Tees.