I think they are similar but not identical problems. For things like some stock price I can see how you could have several competing oracles that can build trus

I think they are similar but not identical problems. For things like some stock price I can see how you could have several competing oracles that can build trust over time, but if you want to monitor and report the amount of solar energy I am producing for mining I can not see how this could work. Especially not if you want to preserve anonymity which kind of rules out that miners crosscheck each other by placing their own sensors.