5 ms·
AFAICT, things are already "financialized" so that things like community solar appear to be "cheaper" to a customer. (Nothing wrong with that, BTW.) I just got
by fghorow 6y ago
AFAICT, things are already "financialized" so that things like community solar appear to be "cheaper" to a customer. (Nothing wrong with that, BTW.)
I just got my first utility bill with a community solar monetary credit. I wrote the following piece attempting to figure out the energy flows -- as opposed to the dollar flows.
-- cut here --
OK. I have a(n energetic) head scratcher with my latest unbundled
electricity bill. It's the first one that includes a community solar
subscription.
For geeks, this is almost a thermodynamics question about systems and
surroundings -- but it's camouflaged as a monetary problem in
disguise...
1) My utility company (NYSEG) charges me a per kW-hr fee for
"transmitting" electricity and servicing their infrastructure. Fine and
dandy. I understand that perfectly.
2) There is a separate per kW-hr fee from a different supplier of
electricity with whom I have contracted for power. Again, I understand
that perfectly.
3) Now the head scratcher. My "community solar" account just started
contributing PV energy to the grid from a recently completed solar
farm. My fraction of energy generated from their deployment just
showed up as a monetary credit to my total bill. They will invoice
me of 90% of that credit, and claim that I "saved 10%" on my
electricity cost. There is no statement whatsoever of the
amount of electrical energy corresponding to that monetary credit.
That's the monetary accounting. Now let's examine the energy accounting.
Let's call the amount of energy from 2) above "N" for my "normal"
source of electrical power. Similarly, let us call the (unknown) amount of energy
from 3) above "S" for my solar PV power.
(In principle, once I knew the fee per kW-hr I was being charged for
the PV energy, I could convert the monetary charge to the numerical
value for S. Let's leave that as an exercise to be dealt with later
after I receive an invoice from the community solar provider -- which
hopefully will tell me their cost-per-unit of energy.)
Clearly, I paid my normal provider for producing N units of energy. However, I
actually consumed (N-S) units of their energy, because I (notionally)
also received S units of solar energy. I understand perfectly that
electricity on a transmission line is fungible, hence I don't actually
receive "electrons" (so to speak) from either of them.
The community solar project will also get paid (at their claimed
"discounted" rate) for producing S units of energy and delivering it
to me via NYSEG.
My conundrum: It seems to me that (N+S) units of electrical energy
have been produced and paid for, but only N units have been
consumed. Hence there are (N+S) - N = S units of electrical energy
"somewhere" that are generated but not consumed via this accounting
system.
Where are those S units? Who owns them? Are they simply going towards
heating up the transmission lines, or is somebody benefiting from
them?
Is it simply the case that NYSEG no longer has to pay for the energy
consumed in heating up their transmission lines, but are still
charging me the same transmission fees???
I don't know the answer to this problem.
Discuss.
- staktrace 6y agoMaybe I'm misunderstanding your problem statement. But it seems to me that you are using (and paying for) N units from your regular provider. And then your community solar operation is selling S units to the grid and giving you a monetary credit (the result of the sale) instead. Some customer (due to fungibility, it could be you or anyone else) is getting those S units, and paying the community solar project (indirectly via the grid). And those S units are displacing some other set of S units that were previously generated by fossil fuels, which is (presumably) one of the main goals of this entire exercise. So maybe the answer to your final question is actually "only N units were actually generated, because the fossil fuel plants ran less and produced S fewer units".
- fghorow 6y agoYour take is more sensible than the one I had. The community solar sells S units to somebody else, credits me with the monetary proceeds of the sale (and possibly a share of the associated Renewable Energy Credit proceeds), and charges me 90% of that "accounting fiction". They make money off the difference between the rates they invoice me for and the wholesale rates they actually sell the energy for (via a PPA or something). I still argue that (N+S) units of energy are actually generated. The original generator of N units has no knowledge of the community solar arrangement, and is producing the N units of energy. Unless the community solar is lying about producing S units of energy -- remember, they are never disclosing S, only the associated monetary amount -- they too are selling S units to somebody else at a wholesale rate but getting their cash flow augmented by invoicing me. What a tangled web of cashflows! I think that a PV array on the roof is preferable in situations where a purchaser is able to do that. Less financial engineering, and more physics! YMMV.