System Information
Operating system: Darwin-18.2.0-x86_64-i386-64bit 64 Bits
Graphics card: Intel Iris Pro OpenGL Engine Intel Inc. 4.1 INTEL-12.4.7

Blender Version
Broken: version: 2.80 (sub 64), branch: blender2.7, commit date: 2019-05-13 22:40, hash: rBf070bdd7c9c4
Worked: (optional)

Short description of error

UPDATE: 2.79 causes the same issue, which it hasn't before. So this is probably some kind of hardware issue.

While rendering, Blender seems to use a ridiculous amount of power (see screencaps), often causing my computer to shut down without warning, causing me to lose any unsaved work. This has happened with several different documents and two different versions of 2.8.

I have not yet had a chance to discover whether other applications or older versions of Blender cause the same problems. I took my computer in for repair earlier this week, assuming it was a hardware issue. They cleaned it out and then stress tested it afterwards and found no issues.

So now I am wondering whether there is a problem with Blender itself.

Note that these up and down spikes are happening during render time. Is this normal battery usage?