I am looking at SolarCity bonds - Certainly would have to maintain a more liquid nest egg, but I like what they're selling
Negatives:
Won't be able to touch the principle for X years
Risk of investing in solar
Postives:
Elon Musk owns a crap ton and won't let it fail
Great consistent returns
chi cat, i don't think you are being adequately compensated for locking up you money (no comment on credit risks - don't know enough about solar city or these securities).
if you want to invest in renewable energy, i think there are more attractive options. and besides, you're too young to be locking your money down in low return, low risk investments. you probably should be more aggressive.