" unnecessarily full-quoted:

You are claiming that any electricity produced by PV arrays that
goes onto the local grid just gets wasted because putting it on
the grid raises the voltage a tiny amount. I think that's what
he meant by saying "it doesn't work". That is you're saying
that PV arrays that have net current flowing into the grid
don't work, because the energy somehow just gets dissapears.

I'm not saying that it dissapears.

I'm saying that if your local grid is sitting at 120V and your panels
come on and raise it to 121V, and if the utility company doesn't
down-regulate their side to bring the local grid back to 120V, then the
current that your panels are injecting is wasted. It's wasted because
all the linear loads on the grid that are designed for 120V will not
operate any better at 121 volts. Motors won't turn faster, lights won't
really burn brighter. They will just give off a little more heat thanks
to the extra current the panels are supplying to the grid.

But sure - electric heaters will get hotter. They're the only devices
on the grid that are intended to convert electrical energy into heat.

There is SO much wrong in your analysis, that I don't know
where to begin. But here's a start. You claim that with
a slightly higher voltage, an AC motor in an HVAC
compressor won't turn any faster and hence the additional
power is wasted. What you've completely overlooked is
that power is P=VI, or power is voltage times current.
Give that motor an extra half a volt and I'll bet it's
current decreases by a corresponding amount.

So why not run a 120V motor with 240 volts then?

AC Motors are not simple loads like a resistor, but they will still
"consume" power (V x I) as a function of their supply voltage.

I'm claiming that there won't be a corresponding voltage
down-regulation at the level of the neighborhood
distribution transformer to make the effort worth while
for all stake holders.

As Bud said a while back, you're new analysis must be
devastating to all the power companies in the world.

All the power companies in the world are in the business of generating
electricity in the thousands of volts and sending it out over
high-tension wires. That's what they'd rather do if they weren't being
hamstrung by crazy ideas and new rules / laws made by politicians about
small-scale co-generation.

Look at the microFIT program in Ontario. When the rules were changed to
allow local utilities to veto hookups based on "network capacity" or
"substation insufficiency", they were only too happy to start swinging
their veto left and right. They don't want to see this small-scale ****
coming on-line if they have a choice.