I'm not actually doing this as I don't currently have access to negative prices, but I do have a battery in my home, so at least in theory it would be possible

I'm not actually doing this as I don't currently have access to negative prices, but I do have a battery in my home, so at least in theory it would be possible for me to charge during negative price times to use the power for peak times. Even better would be to charge my electric car during these times. This does highlight the fact that we need smarter / more configurable home systems, since the decisions about what to do with solar / grid / battery / car can get fairly complex.