The BIGGEST problem with clean energy

I just love watching your videos with my 11 year old! You really make learning physics fun for all ages!! Thank you. 
We also get inspired and start asking our own questions so I thought I might share some of them here. How can we make compound energy storage for homes more accessible and efficient so that individual homes may have their own back up? Self propelled Fitness bikes, treadmills that use the energy created by your workout to power your lights? Etc. 
appliances that don’t plug in but have their own power source built in that connects to a smaller solar or wind turbine in your yard, also decorative that adds to your garden vibe? Phones and devices that have built in wireless solar battery chargers? These are some small scale ideas we have fun talking about, maybe not realistic but fun to dream of. Thanks for inspiring the young minds in my house!!