"...to provide a complementary model which, when using an energy unit of account as the basis of value judgements ..."
The energy unit of account resonates with me. I use it to calculate break even to decide whether and when it is worth to buy new devices. Surprise, surprise, when technology improvements and foreseeable years of use combine, it makes a lot of eco-nomic sense to pay for specific eco-logic upgrades. Here is how it works for me.