Will Solar Power Outshine Oil in the Near Future?

[NTL2009]

I checked out the process for selling power back to the utilities in my area and from it I am lead to believe that the user gets charged for the line at his rate of usage like everybody but get paid for his generation of power because they know what is used and what is and going out.. Check it out.

https://www.renewableenergysolar.net/blog/can-i-sell-electricity-from-solar-energy-to-bge-and-pepco/

It looks like no freebies.

I don't think that answers the question. Let's keep it simple:

Assume you normally use a typical 1 MWH per month. Let's say you install solar panels that exactly off-set your usage, so your net consumption is zero. What would your utility bill be?

It sounds like your bill would be near zero. It sure sounds to me like you are using the grid for (near) free. Why do you say otherwise?

 

[gleem]

That's a good question, I'll try and measure-calculate it. It'll take me some research and stuff but will do it as I'm interested to know myself.

I have played with measurements from a single solar panel, I can't remember exactly but think it farmed maybe 0.10$ over a day (not straight /kwh cost, our billing includes fixed recurring costs). So maybe 30 panels , let's add a 1/3 for bad weather, so 40 panels for 90$ (assumed cost of current elec use - $3*30days) of electricity. $5000 just for the panels (40*$100+$tuff).

then there's the batts...

super rough guess is $10k per person per 15yrs. looking for to getting it from a measurement perspective.

1kwh for 0.08 - 0.16$ is SO CHEAP, it'll be bad lol

Below is a link to an cost estimate sheet from an Ohio Solar company for several roof top installation with battery backup. The estimated utility saving and income over 25 years however seems over optimistic

http://dovetailsolar.com/getattachm...sidential-Battery-Price-Sheet-9-09-2013af.pdf

 

[NTL2009]

I'm not sure if I should start a new thread for this.
I heard this from a questionable source, and trying to fact check it myself did not make clear results. Can anyone here help me? Someone said:

One trillion dollars in windmills and solar panels would generate more power then we get from the middle east. Add a half trillion for power lines and storage and we can forget [the middle east] ever existed.

This was in the context of the Iraq war costing $6 trillion, and "accomplishing nothing". That part probably doesn't belong on PF, but the quote above ought to be demonstrably true or false.

It sounds non-nonsensical to me. Our electrical power is from coal, natural gas, hydro, wind and small amounts of solar, biomass. We don't use very much oil at all for electrical production (0.6%).

https://www.eia.gov/tools/faqs/faq.php?id=427&t=3

Unless you want to convert our entire transportation fleet, and heating oil needs to electric power, we still need oil. And conversion of everything like long haul trucks, trains, etc just isn't feasible at this point. We just don't have practical storage systems - I won't do the math, because we don't even know what numbers we are talking about, but offhand, I don't think a half-trillion $ would go very far in terms of storage and transmission lines for the US. You could work backwards to see where you come up in terms of MWHrs, I'll pass.

I don't want to get into politics, but I don't think that protecting our oil supply is the only reason we spend money on defense in the Middle East.

 

[gleem]

It sounds like your bill would be near zero. It sure sounds to me like you are using the grid for (near) free. Why do you say otherwise?

1 MHhrs per month?

First I would probably be generating more than I could possibly use during the time of generation.so I get paid for supplying the utility. When the sun gets low I need to buy power from the utility when I pay for the connection to the grid. If I have batteries to store the access power I go off the grid.

 

[NTL2009]

1 MHhrs per month?

It's a nice round number, and pretty typical depending on where you live. Some places the average is higher, some lower:

https://www.eia.gov/electricity/sales_revenue_price/pdf/table5_a.pdf

First I would probably be generating more than I could possibly use during the time of generation.so I get paid for supplying the utility. When the sun gets low I need to buy power from the utility when I pay for the connection to the grid.

Why don't you answer the question? It was a simple question - if you net to zero for the year, what would your bill be?

If I have batteries to store the access power I go off the grid.

I'll look at your link in more detail later, but $48,700 isn't appealing to me. Says install on a flat roof (so typically will cost more), and I doubt those batteries last 25 years, are replacements factored in? And is it really sized to store enough power to cut your grid connection? Hmmm, looks like about 1.6 days worth of battery power? Sounds like trouble to me, better add a bunch more batteries.

And I don't count the "rebate" that doesn't change the cost, it only changes who pays for it. I can make the most hair-brained idea sound "cost effective" if I get somebody else to pay for it.

 

[nikkkom]

Below is a link to an cost estimate sheet from an Ohio Solar company for several roof top installation with battery backup. The estimated utility saving and income over 25 years however seems over optimistic

Why is it "over optimistic"? According to the numbers there, ROI is ~10 years. That's about the same that I hear from many other places (even other countries and continents) - prices fell quite a bit, PV installations pay for themselves in 5-10 years depending on local conditions.

 

[NTL2009]

I've never seen 5-10 year ROI numbers for a PV system that included a large battery back up. From what I've seen, 5-10 can be pretty optimistic even for grid tie, with no batteries (and then only in the highest $/kWh regions).

 

[nikkkom]

Since solar installs rate doubles every 2.5 years and price falls by about 20% in the same time period, maybe you just did not see latest numbers and remember the "old" ones from 2-4 years ago?

 

[NTL2009]

1 MHhrs per month?

First I would probably be generating more than I could possibly use during the time of generation.so I get paid for supplying the utility. When the sun gets low I need to buy power from the utility when I pay for the connection to the grid. ...

Looking closer at your source: https://www.renewableenergysolar.net/blog/can-i-sell-electricity-from-solar-energy-to-bge-and-pepco/

that does not appear to be the case at all. You don't pay for everything you draw from the utility, you only pay for the net. And you are using the grid both ways, as a source and a sink. So if you net to zero, you pay close to zero (there may be a small monthly connection fee or something),

In the end you will only be charged for the net amount of power you use: your total usage minus the amount you produce.

 

[nikkkom]

https://www.eia.gov/analysis/studies/powerplants/capitalcost/pdf/capcost_assumption.pdf

Recent US Energy Information Administration's info on costs for various types of generation:

(Advocates of nuclear power, don't look at the pic, it's a disaster).

 

[mheslep]

. The overall fluctuations from solar power can be faster and they are less predictable.

Even assuming solar is perfectly predictable for a moment, it is not dispatchable. Demand is largely inflexible despite decades of attempts make it otherwise, e.g. the hospital must have power at 8pm during peak load.

 

[mheslep]

By this scheme, the grid and all its power plants remain intact, but they would burn hydrogen instead of natural gas and coal. Wind and solar farms would not be directly connected to the grid: all their output would be used to split water, and the resultant hydrogen conveyed to power plants much like natural gas is now.

This effectively describes two grids (plus storage) running side by side at different times, in place of the single one in use now, an enormously expensive solution. I suppose some wealthy countries can attempt such a scheme for some minority fraction of the grid before cost puts a halt to the enterprise. More importantly, the developing countries (India, Indonesia, Turkey, Vietnam, etc) can't and won't attempt something so expensive and, without nuclear, will go on building hundreds of coal plants.

 

[zoobyshoe]

This effectively describes two grids (plus storage) running side by side at different times, in place of the single one in use now, an enormously expensive solution. I suppose some wealthy countries can attempt such a scheme for some minority fraction of the grid before cost puts a halt to the enterprise. More importantly, the developing countries (India, Indonesia, Turkey, Vietnam, etc) can't and won't attempt something so expensive and, without nuclear, will go on building hundreds of coal plants.

I don't see where you get two grids. "The grid" is the electrical grid, which is already in place. The way I see it, the companies who are now mining fossil convert to hydrogen farming and sell their product to the utilities. How you get hydrogen from the farm to the power plant is the same way you now get natural gas from the fracking sites to the power plants. Every time they open a new fracking site, they have to repipe as it is, don't they? A stationary hydrogen farm, on the other hand, would only have to be connected once.

 

[NTL2009]

So, the key to viable wind and solar is not in direct generation of electricity, but in using them to create a storable form of energy that can be used as needed by big power plants. Most are looking at hydrogen gas.

According to this wiki article, storage of hydrogen gas for stationary power plants (as opposed to the mobile car engine) is not especially problematic: ...

While I think there may be merit to converting excess renewable energy to hydrogen to be burned for a turbine generator, this doesn't seem like an issue at all, until we actually have considerable excess renewable energy.

Of the variable renewable sources, solar PV is still a small component, wind is a bit larger. But if we only have excesses on occasion, that won't justify the infrastructure costs to convert it. As much as most of us hate the idea of letting energy go to waste, I think the reality is that until there is considerable excess, and it occurs regularly (allow the imprecise wiggle words like 'considerable' and 'regularly' - I'm just talking very generally), no one is going to invest the resources to store it.

Now maybe if we define 'storage' as just long enough for time-shifting, a few hours worth to handle peaks that occur in the late afternoon/evening, when solar has dropped. There have been plans to use pumped hydro storage for that, the round-trip losses of hydrogen will be far worse than pumped hydro, but hydrogen wouldn't be dependent on the geography (or caves) required for pumped hydro (or caves).

 

[Ken Fabos]

Assume you normally use a typical 1 MWH per month. Let's say you install solar panels that exactly off-set your usage, so your net consumption is zero. What would your utility bill be?

It sounds like your bill would be near zero. It sure sounds to me like you are using the grid for (near) free. Why do you say otherwise?

Apart from subsidies (that are subject to change and unlikely to persist long term) I doubt any arrangements that allow solar customers to be "freeloaders" are widespread or will persist where they are in place. Charging methods appear to vary widely, but where I live the rate I pay for power purchased is about 3x higher than the rate I get paid for the excess PV sold back to the grid (and I'm on a better than average deal in that) - I have heard of early PV feed in metering methods that simply subtracted what gets fed to the grid from what is taken from it but suspect it's an urban myth that anyone is still operating under those arrangements (around here). Also there is a fixed Service Availability Charge that is in addition to the balance between what is bought and what is sold and incorporates the largest part of the costs of grid services. So I certainly pay for grid services - given my low usage and rate of feed to the grid compared to what I take the SAC is the greatest part of the bill and the effective rate per kWh (total bill divided by power imported) is much higher than the stated rate per kWh. I'm aiming to get that price up to infinity, but if it looks like I can succeed I'll be thinking about disconnecting.

Now, I am treated as just another customer and expect supply when I need it, to be charged no differently than any other customer, but there is a case for PV/battery fitted homes to be special cases - where the service is only occasional backup power provision but with them most likely to occur during periods of high demand (from large numbers of PV users switched from self use to import). Given how low my usage is and that I still get a significant amount of solar power even during overcast conditions, I suspect my contributions still exceed the costs of the service provided - but inherent in that is that over time greater proportions of that service will be provided by "peaking" plants rather than "baseload". That "peaking" supply - at higher than average prices - is what storage will compete with.

Some other points - if you have more PV than you use then it can be cost effective to use the excess for hot water heating, especially if the prices you get for exporting the excess is lower than the price you pay for electricity for water heating. If the hot water system is a high efficiency heat pump a little electricity goes a long way. Solar thermal systems may have better conversion efficiencies and simplicity, yet electrical systems are very reliable and can have low costs.

It's a transition and most homes and businesses in developed countries are serviced by existing, mostly reliable, grids; there is no current need for those that install PV and batteries to be 100% self sufficient - and good reasons to remain connected apart from the convenience of making use of that backup, including some that can advantage grid operations. That they cannot currently achieve 100% at reasonable cost doesn't mean they should not aim for a lower proportion as an interim step, even where it's not yet known how the rest can be achieved.

Customers can potentially become active as participants in an energy market, with smart systems able to manage buying, storing and selling power on our behalf and in a market like Australia's National Electricity Market they could bypass the retailers (and a large part of the costs that extra level imposes) and deal directly with the wholesale market. Going away for a few weeks? The batteries can be run lower, selling when prices hit the predetermined threshold to maximise returns. A linked weather and electricity demand prediction service could allow the system to pre-charge our storage during "off peak" periods ahead of prolonged overcast conditions or expected high usage. Equitable arrangements may be contracted that allows the grid operators access to a proportion of stored power, as virtual peaking power plants or for emergency services. The old way of dealing with electricity supply is no longer applicable or even tenable.

I think it would take determined efforts to put the solar genie back into the bottle. It will disrupt a sector that needs serious disrupting in order to undergo fundamental change; guiding that change towards desired outcomes - not preventing them - is what it's about. Emergent market forces from growing proportions of intermittent renewables will tend to create the incentives that policy makers have resisted, that will make investment in storage - and demand management and efficiency - increasingly attractive. Fixed fossil fuel plant - and nuclear (unless it gets special treatment for it's low emissions) - will be forced into greater intermittency during renewables rich periods and have to charge higher prices outside those times to sustain their economic viability; it will (or can be treated as) a de facto carbon price.

 

[mfb]

(Advocates of nuclear power, don't look at the pic, it's a disaster).

Is it?
I could criticize that they only have an "advanced nuclear" entry, no rooftop solar entry, assume solar panel usage for more than 100 years (seriously?), and check in more detail how they arrived at their numbers, but that is not even necessary. Nuclear power is available 80-90% of the time, solar power 10-20% depending on where you are (average power divided by peak power), wind onshore is a bit better but not that much. That alone makes nuclear similar to cheaper than solar and wind (apart from a few very windy places). Add the storage issue and nuclear power wins by a huge margin over wind and solar. It loses against coal and some types of gas, but only because these don't have to pay for the massive environmental damage they cause.

Conversion: For 80% availability, $10/(kW*year) = $1/MWh

Of the variable renewable sources, solar PV is still a small component, wind is a bit larger. But if we only have excesses on occasion, that won't justify the infrastructure costs to convert it. As much as most of us hate the idea of letting energy go to waste, I think the reality is that until there is considerable excess, and it occurs regularly (allow the imprecise wiggle words like 'considerable' and 'regularly' - I'm just talking very generally), no one is going to invest the resources to store it.

Germany is getting there, and there are pilot MW-scale projects to produce hydrogen from electricity. It is fed into the existing natural gas system, combined with gas power plants it acts as storage system.

I heard this from a questionable source, and trying to fact check it myself did not make clear results. Can anyone here help me? Someone said:

One trillion dollars in windmills and solar panels would generate more power then we get from the middle east. Add a half trillion for power lines and storage and we can forget [the middle east] ever existed.

Solar panels plus installation and infrastructure are ~$2/W_peak if we take the values of nikkkom's source,, one trillion would give you 500 GW peak power, and an optimistic average of 100 GW. The US has an average consumption of 450 GW (2014). Windmills can help a bit, but not a factor 5. With a trillion dollars per year it would get more interesting.

 

[russ_watters]

Looking closer at your source: https://www.renewableenergysolar.net/blog/can-i-sell-electricity-from-solar-energy-to-bge-and-pepco/

that does not appear to be the case at all. You don't pay for everything you draw from the utility, you only pay for the net. And you are using the grid both ways, as a source and a sink. So if you net to zero, you pay close to zero (there may be a small monthly connection fee or something),

My understanding is that you only sell back the generation to the utility (not the transmission or distribution). So the power you draw costs double or triple what the power you sell back to the utility costs. So you would need to generate much more than you use in order to have a power bill of zero.

 

[NTL2009]

My understanding is that you only sell back the generation to the utility (not the transmission or distribution). So the power you draw costs double or triple what the power you sell back to the utility costs. So you would need to generate much more than you use in order to have a power bill of zero.

I'm sure that's true in some/many cases, but the link provided they said
https://www.renewableenergysolar.net/blog/can-i-sell-electricity-from-solar-energy-to-bge-and-pepco/

"In the end you will only be charged for the net amount of power you use: your total usage minus the amount you produce."

Now maybe there is fine print in there somewhere that breaks that down into production cost versus total cost including distribution, but I get the impression that consumers expect a near zero bill if the generate as much as they use.

 

[russ_watters]

I'm sure that's true in some/many cases, but the link provided they said
https://www.renewableenergysolar.net/blog/can-i-sell-electricity-from-solar-energy-to-bge-and-pepco/

Now maybe there is fine print in there somewhere that breaks that down into production cost versus total cost including distribution, but I get the impression that consumers expect a near zero bill if the generate as much as they use.

That link doesn't say anything useful to the point we're discussing, but I've looked into it some and it does seem you are correct that at least for the time being, most net metering schemes involve selling back the power at retail rates. But that is likely to change as it constitutes as subsidy for solar users (and as solar has grown, subsidies are reduced):
http://www.eei.org/issuesandpolicy/generation/NetMetering/Documents/Straight%20Talk%20About%20Net%20Metering.pdf

 

[Algr]

Solar panels plus installation and infrastructure are ~$2/Wpeak if we take the values of nikkkom's source,, one trillion would give you 500 GW peak power, and an optimistic average of 100 GW. The US has an average consumption of 450 GW (2014). Windmills can help a bit, but not a factor 5. With a trillion dollars per year it would get more interesting.

https://www.eia.gov/tools/faqs/faq.php?id=727&t=6

It turns out that we can get that statement to work based on the technicality that only 18% of our oil actually comes from the middle east. (We get 38% from Canada.) So far from eliminating all oil use, we only need to switch 18% of it to electrical.

So let's see if I did this right:

We get 1.74 million barrels of oil from the persian gulf per day.
One barrel has 70,000 kW/day of energy.

We get 121.8 GW of energy from the persian gulf. Can a trillion dollars in renewables generate this? MFB's estimate from just solar comes close, and I'm assuming that it takes 11 years to build all this stuff, so efficiency will likely improve.

Now for replacing cars with electrics: Remember that we replace half our cars every 11 years anyway. (The average age of all cars on the road is more than 11 years. Did I interpret that correctly?) So the cost of replacing the cars is not the cost of the cars, but the ADDED cost of electrics vs gas cars. If we assume that we are doing the $1.5 trillion plan over 11 years, then half of our 253 million car fleet will be replaced. Divide $500 billion into that and you have $4098 per car, assuming all cars sold are electric. That many electric cars is well beyond what is needed, so let's assume only half the buyers take that money to by their electric cars, and put the rest into new powerlines.

It sounds like it could work, unless I have made a mistake in the math somewhere.

Edit: I just found another source that says we only get 12.9% of our oil from the persian gulf. I win this game.
http://www.npr.org/2012/04/11/150444802/where-does-america-get-oil-you-may-be-surprised

 

[nikkkom]

Is it?
I could criticize that they only have an "advanced nuclear" entry, no rooftop solar entry, assume solar panel usage for more than 100 years (seriously?), and check in more detail how they arrived at their numbers, but that is not even necessary. Nuclear power is available 80-90% of the time, solar power 10-20% depending on where you are (average power divided by peak power)

Capacity factor in Arizona is 25%, not 20%.

More importantly, the fact that solar works only part of the time *is already accounted for* in these numbers. Otherwise, capital cost of PV would be $13000/kW, way above everything else, and new solar installations in 2016 would not be the largest segment among all new power plants.

That alone makes nuclear similar to cheaper than solar and wind (apart from a few very windy places). Add the storage issue and nuclear power wins by a huge margin over wind and solar.

Business disagrees with you.
Solar power plants are popping all over US southern deserts, faster every year.
At the same time, Westinghouse, which constructs all new nuclear plants in US (four AP1000 units) ran into large cost overruns and filed for bankruptcy in March of 2017.

 

[NTL2009]

https://www.eia.gov/tools/faqs/faq.php?id=727&t=6

It turns out that we can get that statement to work based on the technicality that only 18% of our oil actually comes from the middle east. (We get 38% from Canada.) So far from eliminating all oil use, we only need to switch 18% of it to electrical. ...

Except that oil is a commodity, traded on world markets. Even if we cut our oil consumption by 18%, how would we specifically avoid oil from the ME? And wouldn't other countries just buy that ME oil, so the end effect is nothing?

 

[mfb]

Business disagrees with you.
Solar power plants are popping all over US southern deserts, faster every year.

Yes, because they are subsidized. If they would be so competitive, why would they get subsidies?
Where are the GW-scale commercial battery plants?

Capacity factor in Arizona is 25%, not 20%.

Good for Arizona. Fine, 10%-25%, the former is typical for Germany, for example.

More importantly, the fact that solar works only part of the time *is already accounted for* in these numbers.

The study describes a 20 MW plant with inverters that can handle 20 MW, so the 20 MW are the peak power. The cost of this power plant is $53 million (PV fixed, very similar for the others). That is $2600/kW_peak, or ~$10400/kW_average at 25% capacity factor.

You have to run the solar panels for 90 years to match the installation costs of nuclear power, and ~70 years if we take the operation costs of nuclear power into account. And that is without storage!

Edit: Fixed a number.

 

[russ_watters]

Except that oil is a commodity, traded on world markets. Even if we cut our oil consumption by 18%, how would we specifically avoid oil from the ME? And wouldn't other countries just buy that ME oil, so the end effect is nothing?

Agreed, and I'd say that if the goal of the original statement is to make the Middle East irrelevant in terms of their ability to impact prices and politics, we're pretty much already there. In the 1970s OPEC had a significant ability to harm the US/world economy and that played a small role even in the 2009-10 recession. But their 2014 experiment/price war failed and showed that their ability to affect oil prices is extremely limited without severely harming their own economies. And as a result, they are now the ones in a lot of trouble and they have all but resorted to begging:
http://money.cnn.com/2017/05/11/investing/opec-oil-u-s-supply/

So in terms of whether our foreign policy should be impacted by fear of OPEC, that time is over. But like you say, it's a global commodity, so even if we become a net exporter (and likely will within 10 years), OPEC will need to stop pumping oil for it to stop mattering at all.

 

[NTL2009]

nikkkom said: ↑
More importantly, the fact that solar works only part of the time *is already accounted for* in these numbers.

The study describes a 20 MW plant with inverters that can handle 20 MW, so the 20 MW are the peak power. The cost of this power plant is $53 million (PV fixed, very similar for the others). That is $2600/kW_peak, or ~$13000/kW_average //mfb later corrected this to $10400// at 25% capacity factor.

Right. So they rate it at ~ $2.65/watt, a reasonable number for installed PV. Another way to look at that, if they did account for a 20% capacity factor, then that 20 MW would represent 100 MW of solar panels. That would mean they are paying $0.53/watt (corrected math mistake) for solar installed, and we know that is not a reasonable number.

@nikkkom - This is what happens when one is so enamored with a particular technology - they see a number that agrees with what they want to believe, so they don't question it. Remain skeptical - of everything.

 

[mheslep]

don't see where you get two grids. ...

You proposed leaving all the "existing power plants intact", i.e. the coal and gas plants (fueled instead by hydrogen). That's one. Then you would build another power generation system of comparable size based on solar and wind. That's two. Also, a gas storage system is required, large enough to supply a nation for a month or so.

BTW, the pipelines in place to transport natural gas (hundreds of thousands of miles) have some H2 mixed in but can be wholly converted to hydrogen. H2 would leak where CH4 won't, embrittles pipes not designed for it, and has a lower volumetric energy density than methane requiring a larger pipe diameter to ship energy at the same rate.

 

[mheslep]

While I think there may be merit to converting excess renewable energy to hydrogen to be burned for a turbine generator, this doesn't seem like an issue at all, until we actually have considerable excess renewable energy.

It turns out that storage for intermittent power is required very soon, that is, after a few percent share of generation. As there is already a grid in place to which intermittent power is added, and much of the existing power is slow to start and slow to stop (aka 'must run'), excess power occurs quickly, driving electricity prices to zero and negative where subsidies exist. Negative pricing is already commonplace in Texas (high wind share) and in parts of Europe. Without a large price on carbon or subsidy, new intermittent power is at a price disadvantage with the marginal price of running fossil fuel power, and so forcing the price of intermittent power to be realistic and include the price of storage makes new solar/wind+storage untenable.

 

[mheslep]

ut there is a case for PV/battery fitted homes to be special cases

Please make that case. A gas peaker plant in the US serves peak demand more cheaply than (unsubsidized) utility solar and more reliably, and utility solar is far less expensive than residential rooftop solar, and far, far less expensive than rooftop plus batteries.

suspect my contributions still exceed the costs of the service provided

Unlikely. The nuclear plant closest to me produces power (O&M) at 1.5 cents/kWh.

think it would take determined efforts to put the solar genie back into the bottle

After the financial crisis, Spain cut off its subsidies to solar power for some years. Result:
http://ars.els-cdn.com/content/image/1-s2.0-S096014811630297X-gr1.jpg

 

[nitsuj]

Oh wow, Ontario is Mad about green power. in the attached link is the price schedule for what they call MICROfit (Feed In Terrif for small installations)

The buy back contracts are guaranteed for 20yrs. Probably is calculated to pay for everything but the land.

The amount paid back decreases as installation size increases lol i.e. less than 6kw is 0.31$/kwh!

Doing some digging and some peeps who got in years ago have 0.80$ buy back, on the guaranteed 20yrs contract this one case was a loan payback (on equipment & installation I presume) was 6-7 yrs...with the rest being profit. That was a 10kw pv system.

 

[NTL2009]

It turns out that storage for intermittent power is required very soon, that is, after a few percent share of generation. ...

I'm curious as to how this is determined. Obviously, solar at relatively low average contributions will have a much bigger effect on the grid during those ~ 6 hours of higher output, very roughly 4x the average. That is offset somewhat, as daytime usage is also higher than night-time. Sticking with my very rough numbers, day demand about 2x night demand. So if we had 10% solar on average, it would be contributing about 20% of the grid power during the mid-day. Maybe more in summer due to seasonal variations, but then again, summer can be high demand with A/C.

So my question is, how much solar contribution can the present grid handle (I'm thinking NA grid, with relatively little hydro)? Can it accept 20% from solar one day, and near zero the next? Or a drop from 20% to 5% when a cloud goes by? I suppose if day-time energy production is ~ 80% baseline and 20% some form of peaking, it could do it. But I really don't know where those limits lie. Beyond that, we need storage, or install more peakers as we install more solar (and wind), or just let it be wasted. And if the peaks that can't be absorbed only occur a few times a month, and are only a few percent of excess, I suspect it just isn't economical to do anything but waste it.

 

[nitsuj]

Yes, because they are subsidized. If they would be so competitive, why would they get subsidies?
Where are the GW-scale commercial battery plants?Good for Arizona. Fine, 10%-25%, the former is typical for Germany, for example.The study describes a 20 MW plant with inverters that can handle 20 MW, so the 20 MW are the peak power. The cost of this power plant is $53 million (PV fixed, very similar for the others). That is $2600/kW_peak, or ~$10400/kW_average at 25% capacity factor.

You have to run the solar panels for 90 years to match the installation costs of nuclear power, and ~70 years if we take the operation costs of nuclear power into account. And that is without storage!

Edit: Fixed a number.

Would we have gone to the moon on Investor capital? Or create all those inventions as a result? What about military? This is how the economy works, sometimes the gov money is needed to "push" a tech up and over into being economically viable for investment...so now it is...yay to circumnavigating investor nearsightedness.

Was nuclear brought to fruition on venture capital?

The GW chem storage is going to happen. China seems to be most active with this. Apparently plans to install 500mw in a single location started in '16...cannot find any mention on progress though.

That said why the argument on single system capacity? Seems so weak when wires between make such a thing a "system".

 

[Algr]

Except that oil is a commodity, traded on world markets. Even if we cut our oil consumption by 18%, how would we specifically avoid oil from the ME? And wouldn't other countries just buy that ME oil, so the end effect is nothing?

It is possible to boycott middle east oil, but not really necessary. The other countries who would by from the ME, already are, so they aren't going to increase demand by 18% just to spite us. And the US is hardly the only country that would want to do this. Russia has problems with terrorism too, and Europe would likely take the lead. The result: For a quarter the cost of the gulf war, we dramatically defund terrorism.

But all the political stuff is beside the point. The original statement is this:

One trillion dollars in windmills and solar panels would generate more power then we get from the middle east. Add a half trillion for power lines and storage and we can forget [the middle east] ever existed.

By my numbers, that seems to work.

 

[NTL2009]

Would we have gone to the moon on Investor capital? Or create all those inventions as a result? What about military? This is how the economy works, sometimes the gov money is needed to "push" a tech up and over into being economically viable for investment...so now it is...yay to circumnavigating investor nearsightedness.

Was nuclear brought to fruition on venture capital?

I don't think those are reasonable comparisons. Solar PV has already been brought to you by the government military/space program. It is now in the hands of the market to improve value. Efficiency improvements are still being funded at the government level (at least I seem to see a fair number of university programs, I assume grants are involved), but we are already at the point that we can't expect huge increases in efficiency. A single cell panel is theoretical max ~ 32%, and panels are now around 15% I think? And multi-cell to get higher will almost certainly be higher cost, though maybe worth it to reduce installation costs.

This is kind of a soapbox rant for me, but I think subsidizing sales is about the worst use of funds to promote anything. It encourages sales of the current, less-optimal technology by changing the value proposition for the buyer (paid for by others). What we really want is true value. And that means the technology must be improved. Far better to take those sales subsidy $ and apply it to research. Additional sales of the older product won't do as much for us as developing the next generation, that maybe has a real chance of competing.

I think sales subsidies could actually be counter-productive. Since it creates false demand for current product, it reduces incentives to reduce costs.

I come from a manufacturing background. If we were in a low margin product area, it was essential to cut costs and improve manufacturing efficiencies. If you didn't your product died. In a high margin product area, you could focus more on features, customer support, other less tangible area, you were still making a good profit. We were not as motivated to cut costs on the high margin products. In this same way, solar PV sales subsidies effectively increase the product margin (buyers are willing to pay more to the seller), so therefore reduce motivation to cut costs.

As long as I'm ranting, I recall reading a good article recently - they said that if we are going to have sales subsidies on solar PV, it should be based not on the cost of the installation, but on the energy produced. After all, that is the goal, right? But as it stands, a poor installation that is partially shaded, and on a rooftop at less than optimum orientation, and in a cloudy area of the country gets the same $ subsidy (at least at Fed level) as the installation done in full sun, with proper angles, etc. What a waste of taxpayer funds!

 

[mheslep]

Germany is getting there, and there are pilot MW-scale projects to produce hydrogen from electricity

When it comes to the scale of the energy industry, I don't think 1 MW pilot plants (most are smaller) in Germany qualify as 'getting there' as opposed to propaganda stage props for Energiewende. The US for instance has a very expensive full scale 582 MW attempt at clean coal (sequestered carbon) plant nearing completion in Kemper, Miss. I wouldn't consider this probject as getting close to clean coal, but rather proof of its unfeasibility with current technology.

 

[nitsuj]

As long as I'm ranting, I recall reading a good article recently - they said that if we are going to have sales subsidies on solar PV, it should be based not on the cost of the installation, but on the energy produced. After all, that is the goal, right? But as it stands, a poor installation that is partially shaded, and on a rooftop at less than optimum orientation, and in a cloudy area of the country gets the same $ subsidy (at least at Fed level) as the installation done in full sun, with proper angles, etc. What a waste of taxpayer funds!

I cannot subscribe that the ontario PV industry subsidies will retard the progress of PV tech. I would argue that those subsidies have grown to a great extent the current PV industry in Ontario...More panels, batts and jobs.

If I have old panels that make x amount, why would this stop progress towards a even better pay back? PV is not a trivial thing like a can opener.