The Short List, by Gardner and Stern, describes the relative contributions of different parts of American (and by extension developed nation) energy consumption. The key issue is that the big energy consumers in the home are HVAC and water heating.
If space heating is approximately 19% of the energy use, that’s the big place to focus efforts, but the problem there is that the interventions in that space are for the most part one-time or infrequent. Insulating cavities and lofts has a huge return on investment over time, as does sealing drafts, which is good and bad for our purposes. These projects, ranging from minor (caulking windows, installing door stripping) to major (insulating exterior walls) require planning and execution, and may not be DIY projects for the idle afternoon. The good part about these things is that once they are done, there isn’t more engagement required.
Water heating (including hot water used in clothes washing) is responsible for 6.5% of the energy use. Upgrading water heating systems (installing a tank blanket, tankless heater, and heat recapture exchanger) can reduce the energy required to heat a volume of water, and curtailment behaviors (e.g. shorter showers, washing clothing in cold water, and using a dishwasher/good hand-washing practice) can provide some benefit, at the expense of some potential discomfort or customer engagement (E.ON shower timer anyone?).
Lighting overall has a relatively small overall slice, 6.1% – and this is also amenable to upgrades (LED bulbs, occupancy sensing), and behavioral interventions/habit design.
In terms of our E.ON strategy, the key issue is how to (1) accomplish meaningful energy use reductions and (2) improve customer satisfaction.
- We need to encourage customers to make the one-time investments (time, inconvenience, money) in home upgrades and maintenance. Insulating the loft is not sexy like a Nest, but it’s worth a lot more in terms of carbon. The good part is that you do these things once, the bad part is that they’re probably not really good for cultivating goodwill on a regular basis.
- The little things like timing showers and unplugging chargers is a recurring touchpoint (you do these things 18 times a day), which can be either endless frustration (bad), moral licensing (worse?), or a way to get the brand image into people’s consciousness. If done right the little things can help bring E.ON to the top of mind, and help people to do good things meaningful in aggregate after taking on the big projects. One of the hazards to avoid is having people only do the little behavioral things and not make the investments in the big things that will save them money and carbon over the long term, at the expense of one-time investments.
http://www.tandfonline.com/doi/pdf/10.3200/ENVT.50.5.12-25