TTC is not a 'get me coffee' place to have a fellowship. You get to do real work. TTC works in a lot of different markets and is able to quickly expose interns/ fellows and new employees to industry leaders both in the public and private space. Having been a longstanding DC energy firm, the experience and knowledge they have (and want to share with anyone who comes through their doors) is enormous.
Kontras
TTC knows what markets it wants to work in and makes a point to do just that. If you're looking to be a fellow and potential employee down the line, don't be a renewable energy or clean tech generalist. Be eager to sink your teeth into a single market.
Great coworkers and a good crowd of other fellows. Bosses are very understanding and are eager to help you learn and grow.
Kontras
Depending on who you work with, your tasks can become repetitive, but this is a trivial problem. DC metro can be expensive depending on where you live.