A few years ago, I became slightly obsessed with embodied energy, which led to a new perspective on both materials and design, in the form of a self-initiated experiment and ultimately a design tool. I wanted to share some of my thoughts from this process to try and pass on a passion for embodied energy.
The whole process started by reading David Mackay’s book “Sustainable Energy Without the Hot Air.” His “we need numbers not adjectives” attitude really appealed to me at the time, as I was getting very frustrated with some of the subjectivity and lack of depth in some sustainable design. It was with this mindset that I went searching for embodied energy data. The first time I trawled through a data set, I was pretty intrigued. This was a single number that summarized the intensely complicated journey of a material from digging its ore out of the ground through to the myriad of processes that lead to a usable material. The numbers also varied hugely between materials, revealing energy stories that I was completely unaware of. In a fairly short span of time, this data had completely changed my perspective on a lot of materials that I previously thought I was very familiar with.
What really caught my imagination was the fact that this was physical data. Unlike electricity consumption, where you need to go to great lengths to record and visualize energy, this data told you that the lump of material you’re holding took 10 megajoules of energy to go from earthbound ore to product in hand. I could now define my whole material world in terms of energy—and that’s exactly what I started doing, carrying a screwdriver and a set of scales I started disassembling and weighing products to try and calculate their embodied energy. This quickly escalated to doing an embodied energy calculation for everything I owned.
These calculations were very rough, but gave me an approximate figure for everything, allowing me to compare different elements of my lifestyle. Computers and camera gear, with their exotic circuitboard materials and batteries, far outweighed everything else, while other things, like my bikes, seemed pretty insignificant. This showed me that crunching the numbers, however crudely, will reveal all sorts of insights into the energy stories of our stuff.
At this point, I had gathered a lot of data and started to see the world in a slightly different light but what I was really interested in was how this data would affect the design process. There were various tools for conducting life cycle analysis on finished designs but I wanted to experiment with ways of using embodied energy to drive the design process from the start. I set myself a simple design brief with ambitious energy quotas. To redesign the Anglepoise lamp (which had weighed in at 140 Megajoules) to quotas of one, ten and 20 Megajoules. The idea was to put energy as the driving force at the start of the design process and see what happens.