They have decided that now that they've invested in their first house together (they lived in a house the H bought before they were married that met his needs at that time) and will be there for some time and both are maxing out their 401(k) and 403(b) with matches at work and started a 529 for their 1-year-old (plus H has IBM stock from his parents' days at that firm) that their next investment should be in solar. They see that as a good return on their money based on the high electricity costs in their area, and spent time developing scenarios. (H rebuilds and races cars for a hobby, dating back long before the marriage. So, I think they want to invest in something that improves the house for all three of them, something more tangible than paper investments -- at least, that's how I see them acting!)