GDP by PPP is not perfect but it is far better than nominal where it states the US is the larger economy when China consumes at least twice as much across a variety of major goods and energy!
The keys are China's consumption numbers proving it is larger than the US.
As for India, the numbers are definitely skewed. Their consumption figures on cars and electricity are 1/7th and 1/6th of that of China. So from the consumption standpoint the India's economy is around 5 or 6 times smaller.
That said, electricity usage is third after China and the US. All economic activity results from energy usage:
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