<human>:  What are some of the most promising startups in the solar energy industry?
<bot>: 
1. SolarCity is one of the most promising startups in the solar energy industry.
2. Another promising startup in the solar energy industry is SunPower.
3. SunRun, a residential solar service provider, is another promising startup in the solar energy industry.
4. Sungevity is a solar energy company that offers turnkey solutions for homeowners.
5. BrightSource Energy is a leading solar energy company that develops, designs and builds large-scale solar power plants.