>"I have 40 kWh of batteries in my home, for backup and time-shifting, and I participate in a grid-stabilization program with my power company."
OK, I was thinking more like grid backup, not just stabilization.
>"The grid never draws significant energy from my batteries [...] I see an otherwise-unexplained spike of 5-10 kW flowing from my batteries and into the grid, for a period of 2-5 minutes. 10 kW for 5 minutes is ~0.8 kWh, which is 2% of my house battery storage. I see a draw that large maybe once per week; usually it's much less. "
That sounds pretty reasonable.
>"What do I get for allowing the power company to do that? For the first year of participation, I got a check for $2000. For subsequent years I'll get bill credits of up to $50/month, applied to energy charges only. I'm not sure how much that will translate to, since my net energy purchase is usually zero (thanks to solar panels). It's a great deal for the first year. Beyond that... we'll see."
Looks like you have a good setup.
Thanks for the good/informational posting!