fix estimate bug

[Yanbo0101]

This pr is to fix #127

[sunya-ch]

Thank you so much for identifying the bug and make a fix.
The fix looks fine to me.
However, in my opinion, estimated results should be reported per each energy source.
If we want to estimate multiple energy sources at the same time. We should separate best result for each energy source.

If we want to keep one energy source, to fix the current bug, we can change only line 396 to [args.energy_source].

If we want to provide estimation for multiple energy sources at the same time, we need to move section save best result to energy source loop and save the file with prefix of the energy source.

[Yanbo0101]

Thank you so much for identifying the bug and make a fix. The fix looks fine to me. However, in my opinion, estimated results should be reported per each energy source. If we want to estimate multiple energy sources at the same time. We should separate best result for each energy source.

If we want to keep one energy source, to fix the current bug, we can change only line 396 to [args.energy_source].

If we want to provide estimation for multiple energy sources at the same time, we need to move section save best result to energy source loop and save the file with prefix of the energy source.

Thanks for your comments. Fixed.

[sunya-ch]

Thank you. /lgtm