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View Menu -> All Processes.

It's only showing you Applications from the last 8 hours by default.

The menu of the battery status indicator also shows a summary of this, if there are applications that are using lots of power (see https://support.apple.com/en-us/HT202776)

For those interested in the way Energy Impact is computed: https://blog.mozilla.org/nnethercote/2015/08/26/what-does-th...

In 10.9 it was a simple function of on-CPU time and wakeups with each wakeup counted as 500µs of CPU time, in 10.10 a bunch of new counters were added (with machine-specific conversions to CPU time estimates) variables were added to the mix: whether the process was in "background" QoS, the number of disk read/writes, GPU usage and network activity (in packets#)