At present address, solar PV installation has been very efficient and I was planning to install batteries to enhance benefit, but now have to move. Still has 20 yrs to run on the original high tariff, so I will be factoring this into the asking price.
Solar PV was definitely the easiest system to install (in fact, the only feasible option at my current property) has been very efficient and made us - financially speaking - very nearly self-sufficient in energy, i.e. the amount we earn (at 2011 terms) nearly matches our energy (electricity and gas) bills!
Now batteries are becoming more affordable, this is the obvious next step.