@ccook You only need to look briefly at @kevin1’s truly exhaustive dives into TOU and tariffs to know that for Sense to “expand on their electricity cost section” is pretty much the definition of non-trivial:
In my mind the dynamics of TOU/tariffs, meaning the frequency of change and feedback loop to solar producers/consumers on the grid, is going to get faster than any statically-entered numbers could accommodate. So, beyond being able to encode in some way the many varied TOU rates, you also have the issue of “by the time you’ve entered it it changed”. It’s a tough ask and I can understand why Sense might want to focus elsewhere for now.
One can imagine a viable solution though: A neat little button in Sense along the lines of
“Subscribe to TOUP”;
Enter server name ___________.
TOUP = Time Of Use Protocol.
Like all protocols, a many-varied industry would need to get behind it and standardize things. Non-trivial and mostly beyond Sense’s control. But some things do get going from the bottom-up!