Clean Energy Options And Nuclear Safety Essays

Dungeness nuclear power station in Kent, UK (photo Simon Ingram, 2014)

Don’t believe the spurious claims of nuclear shills constantly putting down renewables, writes Mark Diesendorf, Associate Professor of Interdisciplinary Environmental Studies at UNSW Australia. Clean, safe renewable energy technologies have the potential to supply 100% of the world’s electricity demand – but the first hurdle is to refute the deliberately misleading myths designed to promote the politically powerful but ultimately doomed nuclear industry. Courtesy The Ecologist.

Nuclear energy and renewable energy are the principal competitors for low-carbon electricity in many countries. As renewable energy technologies have grown in volume and investment, and become much cheaper, nuclear proponents and deniers of climate science have become deniers of renewable energy.

The strategies and tactics of renewable energy deniers are very similar to those of climate science deniers. To create uncertainty about the ability of renewable energy to power an industrial society, they bombard decision-makers and the media with negative myths about renewable energy and positive myths about nuclear energy, attempting to turn these myths into conventional wisdom. In responding to the climate crisis, few countries have the economic resources to expand investment substantially in both nuclear and renewable energy. This is demonstrated in 2016 by the UK government, which is offering huge long-term subsidies to nuclear while severely cutting existing short-term subsidies to renewable energy.

This article, a sequel to one busting the myth that we need base-load power stations such as nuclear or coal, examines critically some of the other myths about nuclear energy and renewable energy. It offers a resource for those who wish to question these myths. The myths discussed here have been drawn from comments by nuclear proponents and renewable energy opponents in the media, articles, blogs and on-line comments.

Myth 1: Base-load power stations are necessary to supply base-load demand. 

Variant: Base-load power stations must be operated continuously to back-up variable renewable energy systems. 

Variant: Renewable energy is too variable to reliably make the principal contribution to large-scale electricity supply.

This myth is refuted in my previous article.

Myth 2: There is a renaissance in nuclear energy.

Global nuclear electricity production in terawatt-hours per year (TWh/y) peaked in 2006. The percentage contribution of nuclear energy to global electricity peaked at 17.5% in 1993 and declined to under 11% in 2014. Nowadays annual global investment in nuclear is exceeded by investment in each of wind and solar. Over the past decade the number of global start-ups of new nuclear power reactors has been approximately balanced by the number of closures of existing reactors. While several European countries are phasing out nuclear energy, most growth in nuclear reactor construction is occurring in China, Russia, India and South Korea. (World Nuclear Industry Status Report 2015)

Myth 3: Renewable energy is not ready to replace fossil fuels, and nuclear energy could fill the (alleged) gap in low-carbon energy supply.

Most existing nuclear power reactors are classified as Generation 2 and are widely regarded as obsolete. The current generations of new nuclear power stations are classified as Generation 3 and 3+. Only four Generation 3 reactors have operated, so far only in Japan, and their performance has been poor. No Generation 3+ reactor is operating, although two are under construction in Europe, four in the USA and several in China. All are behind schedule and over-budget – the incomplete European reactors are already triple their budgeted prices. Not one Generation 4 power reactor – e.g. fast breeder, integral fast reactor (IFR), small modular reactor – is commercially available. (World Nuclear Industry Status Report 2015) So it can be argued that modern nuclear energy is not ready.

On the other hand, wind and solar are both growing rapidly and are still becoming cheaper. Large wind and solar farms can be planned and built in 2-3 years (compared with 10-15 years for nuclear) and are ready now to replace fossil and nuclear electricity.

Myth 4: Nuclear weapons proliferation is independent of civil nuclear energy.

Variant:Nuclear weapons explosives cannot be made from the type of plutonium produced in conventional nuclear power reactors, or from the thorium fuel cycle, or from the IFR.

Six countries (France, India, North Korea, Pakistan, South Africa and the UK) have covertly used civil nuclear energy to assist them to develop nuclear weapons. In addition, at least seven countries (Argentina, Australia, Brazil, Iran, Libya, South Korea and Taiwan) have used civil nuclear energy to commence covertly developing nuclear weapons, but then terminated their programs (references in Diesendorf 2014). Thus nuclear energy is facilitating proliferation and therefore is increasing the probability of nuclear war. Even if the probability of nuclear war is small (and this is debatable), the potential impacts are huge. Therefore it is inappropriate to ignore the proliferation risk, which is probability multiplied by potential impact.

Thorium reactors are under development in India. Thorium is not fissile, so it first has to be bombarded with neutrons to convert it into uranium-233, which is. Like any fissile element, U-233 can be used either to generate heat and hence electricity, or as a nuclear explosive. Nuclear weapons with U-233 as part of the explosive have been tested by the USA (Teapot MET test), Soviet Union and India.

Some nuclear proponents claim incorrectly that the hypothetical IFR would be proliferation-proof.  The IFR has only ever operated as a single prototype in the USA. The project was cancelled by Congress in 1994 for reasons including funding, doubts about whether it was needed, and concerns about its potential for proliferation (Kerry 1994). The IFR offers at least two proliferation pathways. Once it has separated most of the highly radioactive fission products from the less radioactive transuranics by means of an experimental process known as pyroprocessing, it would be easier to extract the plutonium-239 from the transuranics by means of conventional chemical reprocessing and use it to produce nuclear weapons. An alternative proliferation pathway would be to modify an IFR to enable it to be used as a breeder reactor to produce weapons grade plutonium from uranium-238 – see also Wymer et al. (1992).

Myth 5: The death toll from the Chernobyl disaster was 28-64.

These absurdly low estimates are obtained by considering only short-term deaths from acute radiation syndrome and ignoring the major contribution to fatalities, namely cancers that appear over several decades. For Chernobyl, the lowest serious estimate of future cancer deaths was ‘up to 4000’ by the Chernobyl Forum (2006), a group of United Nations agencies led by the International Atomic Energy Agency (IAEA), which has the conflicting goals of promoting nuclear energy and applying safeguards against inter alia accidents and proliferation. Estimates from authors with no obvious conflict of interest range from 16,000 from the International Agency for Research on Cancer to 93,000 from a team ofinternational medical researchers from Ukraine, Russia and elsewhere.

Myth 6: The problem of permanently storing high-level nuclear wastes has been solved.

All high-level waste is currently in temporary storage in pools or dry casks. Not one permanent repository is operating in the world. Development of the proposed US repository at Yucca Mountain in the USA was terminated after expenditure of $13.5 billion. Underground repositories are under construction in Sweden and Finland. Even if the technical and economic challenges could be solved, the social problem of managing or isolating the repositories for 100,000 years remains.

Myth 7: The IFR could ‘burn up’ the world’s nuclear wastes.

The IFR only exists as a design. If it were ever developed, it would become another proliferation pathway (see Myth 4). At best it could convert most transuranics to fission products, so underground long-term repositories would still be needed for the highly radioactive fission products.

For a fuller exposition of the problems of IFRs and other ‘new’ reactor designs, see Amory Lovins’s classic 2009 essay, recently republished on The Ecologist: ‘ “New” nuclear reactors? same old story‘.

Myth 8: Nuclear energy emits no or negligible greenhouse gas emissions.

Neither nuclear energy nor most renewable technologies emit CO2 during operation. However, meaningful comparisons must compare whole life-cycles from mining the raw materials to managing the wastes. Nuclear physicist and nuclear supporter Manfred Lenzen found average life-cycle emissions for nuclear energy, based on mining high-grade uranium ore, of 60 grams of CO2 per kilowatt-hour (g/kWh), for wind of 10–20 g/kWh and for natural gas 500–600 g/kWh.

Now comes the part that most nuclear proponents try to ignore or misrepresent. The world has only a few decades of high-grade uranium ore reserves left. As the ore-grade inevitably declines, the fossil fuel used to mine (with diesel fuel) and mill uranium increases and so do the resulting greenhouse gas (GHG) emissions. Lenzen calculates that, when low-grade uranium ore is used, the life-cycle GHG emissions will increase to 131 g/kWh. Others have obtained higher levels. This is unacceptable in terms of climate science. Only if mining low-grade ore were done with renewable fuel, or if fast breeder reactors replaced burner reactors, could nuclear GHG emissions be kept to an acceptable level, but neither of these conditions is likely to be met for decades at least.

For more on this topic, see Keith Barnham’s article ‘False solution: nuclear power is not low carbon’.

Myth 9: Nuclear energy is a suitable partner for renewable energy in the grid.

Making a virtue out of necessity, nuclear proponents claim that we can have both (new) nuclear and renewables in the same grid. However, nuclear energy is a poor partner for a large contribution of variable renewable energy in an electricity supply system for four reasons:

(1)  Nuclear power reactors are inflexible in operation (see response to Myth 10), compared with open cycle gas turbines (which can be biofuelled), hydro with dams and concentrated solar thermal (CST) with thermal storage. Wind and solar PV can supply bulk energy, balanced by flexible, dispatchable renewables, as discussed previously.

(2)  When a nuclear power station breaks down, it is usually off-line for weeks or months. For comparison, lulls in wind last typically for hours or days, so wind does not need expensive back-up from base-load power stations – flexible dispatchable renewable energy suffices.

(3)  Wind and solar farms are cheaper to operate than nuclear (and fossil fuels). Therefore wind and solar can bid lower prices into electricity markets and displace nuclear from base-load operation, which it needs to pay off its huge capital costs.

(4)  Renewables and nuclear compete for support policies from government including scarce finance and subsidies. For example, the UK government commitment to Hinkley C, with enormous subsidies, has resulted in removal of subsidies to on-shore wind and solar PV.

Myth 10: Nuclear power reactors can generally be operated flexibly to follow changes in demand/load.

The limitations, both technical and economic, are demonstrated by France, with 77% of its electricity generated from nuclear. Since the current generation of nuclear power stations is not designed for load-following, France can only operate some of its reactors in load-following mode some of the time – at the beginning of their operating cycle, with fresh fuel and high reserve reactivity – but cannot continue to load-follow in the late part of their cycle. This is acknowledged by the World Nuclear Organisation.

Load-following has two economic penalties for base-load power stations:

  • Substantially increased maintenance costs due to loss of efficiency.
  • Reduced earnings during off-peak periods. Yet, to pay off of their high capital cost, the reactors must be operated as much as possible at rated power.

France reduces the second economic penalty by selling its excess nuclear energy to neighbouring countries via transmission line, while parts of Australia soak up their excess base-load coal energy with cheap off-peak water heating.

Myth 11: Renewable energies are more expensive than nuclear.

Variant: Nuclear energy receives smaller subsidies than renewable energy.

Both versions of the myth are false. Levelised costs of energy (LCOE) depend on the number of units installed at a site, location, capital cost, interest rate and capacity factor (actual average power output divided by rated power). LCOE estimates for nuclear are $108/MWh based on pre-2014 data from the IPCC and $97-132/MWh based on pre-2015 data from multinational financial consultants Lazard. The IPCC cost estimate does not include subsidies, while the Lazard estimate includes US federal government subsidies excluding loan guarantees and decommissioning.

None of these US estimates takes account of the huge escalation in costs of the two European Pressured Water Reactors (EPR) under construction (mentioned in Myth 3). The EPR proposed for the UK, Hinkley C, is being offered a guaranteed inflation-linked price for electricity over 35 years, commencing at £92.5/MWh (US$144/MWh) (2012 currency), more than double the wholesale price of electricity in the UK, together with a loan guarantee of originally £10 billion (US$15.3 billion). Its capped liability for accidents and inadequate insurance is likely to fall upon the British taxpayer.

In 2015 Lazard estimated unsubsidised costs for on-shore wind across the USA of US$32–77/MWh. An independent empirical study by US Department of Energy (Fig. 46) found levelised power purchase agreement prices in 2014 for wind in the US interior (region with the highest wind speeds) of US$22/MWh, and in the west (region with lowest wind speeds) about US$60/MW. The US government subsidises wind with a Production Tax Credit of US$23/MWh over 10 years, so this must be added to the DoE figures to obtain the actual costs. In Brazil in 2014, contracts were awarded at a reverse auction for an average unsubsidised clearing price of 129.3 real/MWh (US$41/MWh).

Lazard estimated unsubsidised costs of US$50–70/MWh for large-scale solar PV in a high insolation region of the USA. In New Mexico, USA, a Power Purchase Agreement for US$57.9/MWh has been signed for electricity from the Macho Springs 50 MW solar PV power station; federal and state subsidies bring the actual cost to around US$80–90/MWh depending on location. In Chile, Brazil and Uruguay,unsubsidised prices at reverse auctions are in the same range (Diesendorf 2016). Rooftop solar ‘behind the meter’ is competitive with retail grid electricity prices in many regions of the world with medium to high insolation, even where there are no feed-in tariffs.

For CST with thermal storage, Lazard estimates US$119-181/MWh.

Comparing subsidies between nuclear and renewable energy is difficult, because they vary substantially in quantity and type from country to country, where nuclear subsidies may include some or all of the following (Diesendorf 2014):

  • government funding for research and development, uranium enrichment, decommissioning and waste management;
  • loan guarantees;
  • stranded assets paid for by taxpayers and electricity ratepayers;
  • limited liabilities for accidents covered by victims and taxpayers;
  • generous contracts for difference.

Subsidies to nuclear have either remained constant or increased over the past 50 years, while subsidies to renewable energy, especially feed-in tariffs, have decreased substantially (to zero in some places) over the past decade.

Myth 12: Renewable energy is very diffuse and hence requires huge land areas.

Hydro-electric dams and dedicated bioenergy crops can occupy large areas, but renewable energy scenarios for few regions have large additional contributions from these sources. Solar farms located on-ground may occupy significant land, often marginal land. Rooftop solar, which is widespread in Germany and Australia, and bioenergy derived from crop residues occupy no additional land. On-shore wind farms are generally located on agricultural land, with which they are highly compatible. The land occupied istypically 1-2% of the land spanned. renewable energy deniers often ignore this and misleadingly quote the land area spanned.

For an economic optimal mix of 100% renewable electricity technologies calculated for the Australian National Energy Market, total land area in km2/TWh/y is about half that of equivalent nuclear with a hypothetical buffer zone of radius 20 km, as belatedly established for Fukushima Daiichi (Diesendorf 2016).

Myth 13: Energy payback periods (in energy units, not money) of renewable energy technologies are comparable with their lifetimes.

Nowadays typical energy payback periods in years are: solar PV modules 0.5-1.8; large wind turbines 0.25-0.75; CST (parabolic trough) 2; nuclear (high-grade-uranium ore) 6.5; nuclear (low-grade-uranium ore) 14 (references in Diesendorf 2014, Table 5.2). The range of values reflects the fact that energy payback periods, and the related concept of energy return on energy invested, depend on the type of technology and its site. Critics of renewable energy often quote much higher energy payback periods for renewable energy technologies by assuming incorrectly that each has to be backed-up continuously by a fossil fuelled power station.

Myth 14: Danish electricity prices are among the highest in Europe, because of the large contribution from wind energy.

Danish retail electricity prices are among the highest in Europe, because electricity is taxed very heavily. This tax goes into consolidated revenue – it does not subsidise wind energy. Comparing tax-free electricity prices places Denmark around the European average. Wind energy in Denmark is subsidised by feed-in tariffs funded by a very small increase in retail electricity prices, which is offset by the decrease in wholesale electricity prices resulting from the large wind energy contribution.

Myth 15: Computer simulation models of the operation of electricity grids with 80-100% renewable electricity are meaningless over-simplifications of real systems.

Although a model is indeed a simplified version of reality, it can be a powerful low-cost tool for exploring different scenarios. Most modellers start with simple models, in order to understand some of the basic relationships between variables. Then, step-by-step, as understanding grows, they make the models more realistic.

For example, initially the UNSW Australia group simulated the operation of the Australian National Electricity Market with 100% renewable energy in hourly time-steps spanning a single year. Wind farms were simply scaled up at existing sites. The next model included economic data and calculated the economic optimal mix of renewable energy technologies and then compared costs with low-carbon fossil fuelled scenarios.  Recently the simulations were extended to six years of hourly data, the renewable energy supply region was decomposed into 43 sub-regions and a limit was imposed on non-synchronous supply. With all these refinements in the model, the 100% renewable energy system is still found to be reliable and affordable.

Meanwhile, researchers at Stanford University have shown that all energy use in the USA, including transport and heat, could be supplied by renewable electricity. Their computer simulations use synthetic data on electricity demand, wind and sunshine taken every 30 seconds over a period of six years. Using synthetic data allows modellers to include big hypothetical fluctuations in the weather. Such sensitivity analysis strengthens the power and credibility of the models.

Strangely, some of the loudest critics of simulation modeling of electricity systems, a specialised field, have no qualifications in physical science, computer science, engineering or applied mathematics. In Australia they include two biologists, a social work academic and an occupational therapist.


Computer simulation models and growing practical experience suggest that electricity supply in many regions, and possibly the whole world, could transition to 100% renewable energy. Most of the renewable energy technologies are commercially available, affordable and environmentally sound. There is no fundamental technical or economic reason for delaying the transition.

The pro-nuclear and anti-renewable energy myths disseminated by nuclear proponents and supporters of other vested interests do not stand up to examination. Given the political will, renewable energy could be scaled up long before Generation 3 and 4 nuclear power stations could make a significant contribution to electricity supply.


Diesendorf M (2014) Sustainable Energy Solutions for Climate Change. London: Routledge and Sydney: NewSouth Publishing.

Diesendorf M (2016) Subjective judgments in the nuclear energy debate. Conservation Biologydoi:10.1111/cobi.12692. (See the Supporting Information as well as the short article.)

Kerry, Senator J (1994) Energy and Water Development Appropriations Act, 1995. Congressional Record, 11 August.

Wymer RG et al. (1992) An Assessment of the Proliferation Potential and International Implications of the Proliferation Potential and International Implications of the Integral Fast Reactor. Martin Marietta K/IPT-511 (May); prepared for the Departments of State and Energy.

Editor’s Note

Reprinted with minor revisions, with permission, from The Ecologist.

For at least the next 10 years, when considering new capacity, there should be little doubt that renewables will be the generation method of choice. Utility PV, solar thermal (especially with molten salt storage as a baseload source), wind, rooftop solar and biomass will be the highlights, along with contributions from biogas (sewage, landfills and livestock), geothermal, and maybe even some wave and tidal. Advances in storage technologies and reductions in price will help remove the intermittency concerns of some renewables. The next ten years should be another decade of rapid growth.

When considering a transition from the dirtiest of fossil fuels, nuclear is also a possibility, and therefore, nuclear will be discussed along with renewables. Nuclear’s time to build, risk, waste and especially costs will be scrutinized, as the costs for nuclear are rising while renewable costs are decreasing.

Cities and nations are rapidly installing small and large-scale renewable power sources and new storage technologies. Even China, currently the most aggressive country with respect to nuclear power, is adding more capacity with wind and solar compared to nuclear — and it’s not just nameplate capacity — it’s actual generated power. Last year alone, China added 20.72 GW of wind (4.8 GW output as their capacity factor is only 23 percent) and 28 GW of solar (10.6 GW output), with around 90 percent of their solar installations coming from utilities. New capacity from wind and solar were more than the 5 nuclear plants added in the same year (5.7 GW output). China is just one example of how wind and solar can be built faster while generating more power. By the time (and if) China completes their 28 nuclear plants (many are already behind schedule), with an added capacity of 34 GW, they will have added more power from wind and solar in the same timeframe — again, taking capacity factors into account.

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In the next 10 years, here in the U.S., our five nuclear plants are many years behind schedule and are billions of dollars over budget. When they come online, they will generate 5.1 GW while renewables will generate a very conservative 131 GW.

Let’s take a look at the last 10 years and the next 10 years…

New U.S. renewable and nuclear capacity added the last 10 years (output):

  • 55 GW utility wind (22 GW)
  • 17 GW rooftop PV solar (3.5 GW) 
  • 10 GW utility PV and solar thermal (2.5 GW)
  • 15 GW biomass and biogas (12 GW)
  • 3 GW Geothermal (2.5)

Total renewables: 100 GW (42.5 GW)
Total nuclear: Marginal increase from existing plants

In the last 10 years, renewables added around 40 nuclear reactors-worth of electricity.

U.S. renewable and nuclear plan the next 10 years capacity and (output):

  • 130 GW utility wind (52 GW)
  • 75 GW rooftop PV solar (15 GW)
  • 35 GW utility PV and thermal solar (9 GW)
  • 60 GW biomass and biogas (51 GW)
  • 5 GW Geothermal (4 GW)

Additional renewable power next 10 years: 305 GW (131 GW)
Additional nuclear power next 10 years: 5.6 GW (5.1 GW)


In the next 10 years, renewables will add well over 100 nuclear reactors-worth of electricity.

The above output numbers for renewables assume no advances in wind or solar efficiency and no grid storage. Both assumptions will become completely false, so the 131 GW number should be considered a minimum number. Capacity factor numbers used were 40 percent wind, 25 percent utility solar, 20 percent rooftop PV, 85 percent biomass/biogas, 80 percent geothermal. Note that some of the utility solar added to the grid was solar thermal with molten storage, with an 80 percent capacity factor, so 25 percent capacity factor number was used to encompass all utility solar. Obviously, we can not use EIA’s capacity factor numbers for renewables, as they only have renewable generation data for the last four months of 2014. That means no summer months for solar and a few missed windy months for wind.

The additional nuclear power output of 5.1 GW will come from 5 under construction plants that are behind schedule and billions over budget. They include Watts Bar, Summer and Vogtle. Even favorable policies and new plant approvals won’t change nuclear’s contribution — nuclear is expensive and takes too long to build. The next 10 years = five reactors = 5.1 GW output.

The 10 year projection for renewables is highly conservative. We excluded EIA’s projections due to flawed data (more on that here


, here and here), but I’ve considered Exxon’s really low projections and ACORE’s really high projections. The estimate of 131 GW for renewable generation is about half of the optimistic generation estimate of 254 GW, although even that estimate is obtainable with favorable policies.

So, here is the big question: why are renewables growing faster than nuclear, even in places like China where they are building the most reactors? In places like the U.S., Japan and Europe, is it because of nutty environmentalists and anti nuclear groups? Isn’t that what happened with Vermont Yankee? Actually, no - Vermont Yankee really closed because the O&M costs became too high. The real answers: risk, cost and time to build.


Nuclear Takes Longer to Build and Costs More than Renewables

Nuclear plants today are far more complex than the ones built decades ago. The AP1000 is a new reactor, and both China and the U.S. are behind schedule with their reactors. Here in the U.S., take Vogtle for example. Vogtle is now running three years behind schedule — and over $2 billion USD over budget. The revised expected price tag for the two reactors is now around $15 billion USD, and rising. These delays and budget overruns so far have cost Georgia ratepayers an extra $14 per month on their electric bill. When finished, Vogtle's two reactors will generate wholesale power at rates around $120 per MWh — that’s $0.12/kWh which is the current national average RETAIL rate. The other three reactors will have generation rates at least $108 per MWh, equivalent to $0.108 per kWh. So, the next time you hear Ted Cruz or the Koch brothers talk about how renewables are going to raise utility bills, remember, reality proves otherwise.

When considering Levelized Cost of Energy (LCOE), nuclear decommissioning costs are excluded from the calculation. This is a big deal, because recent decommissioning costs have been running between $1 billion USD (Vermont Yankee) and $4 billion USD (San Onofre). Then, there are ongoing costs, as nuclear waste remains on-site and must be guarded and secured. While ratepayers pay a fee to cover the decommissioning costs, the fees collected were based upon old cost estimates. $900 million in subsidies have already been provided for decommissioning costs (more on that herebwfyafxbvtawadxuaezzd), and this figure is expected to rise as current deficits are in the tens of billions of dollars range (more on that here).

Also not included: potential cleanup costs from a nuclear incident. Japan’s government has already spent over $100 billion USD on cleanup efforts related to Fukushima, and it’s projected the cost will exceed $300 billion USD. Bottom line is that even without cleanup costs, wind, solar and other renewables are less expensive to build and electric rates are less expensive than nuclear. More on LCOE can be found here. Remember, nuclear decommissioning costs are NOT included, even though those costs are eminent.

Speaking of subsidies, are you tired of hearing how renewables are highly subsidized compared to fossil fuels and nuclear? Anyone that makes this statement is either lying or they simply have not done their homework. When considering lifetime subsidies, the oil, coal, gas and nuclear industries have received approximately $630 billion in U.S. government subsidies. Wind, solar, biofuels and other renewable sectors have received a total of roughly $50 billion in government investments. Also, oil and gas subsidies were five times greater than renewables during the first 15 years of each subsidy’s life and more than 10 times greater for nuclear. Furthermore, consider that non-renewable subsidies are guaranteed to renew, offering those industries decision-making security, while renewable subsidies have been uncertain. How fair is that? You can find more info on subsidies here and here.

Who makes the decision whether to build nuclear or renewables? Is it the pro nuclear or pro renewable camps? No, it’s the utilities and consumers, and they are the ones choosing renewables. Utilities are purchasing wholesale power cheaper from renewables than from coal, nuclear and sometimes even cheaper than from gas. Hydro has always been cheap, but consider wind and solar. Utilities are securing PPAs from wind and solar at rates in the 2.5 to 5 cent/kWh range for wind, and 5 to 9 cent/kWh range for solar. For example, the 50 MW Macho Springs solar plant in New Mexico delivers power for 5 cents/kWh under their PPA. That is especially low, but most U.S. solar projects in the U.S. have PPAs in the 6 to 8 cent/kWh range. Even if you take out the PTC from wind in Texas, a utility would still be buying power under 5 cents/kWh. Furthermore, prices for wind and solar continue to drop rapidly. More info on recent PPAs here.

Do we need nuclear as a baseload source of energy?

If we are to transition from fossil fuels, it’s important to note that during this transition, existing nuclear power plants are needed. Nuclear provides 19% of our baseload electricity. The nuclear plants in operation today have already been built, and decommissioning costs are eminent, no matter when they close. Provided they continue to operate safely, they will continue to help offset fossil fuel use. With plant extension plans, many plants can operate for another 30 or more years.

What about renewable’s intermittency and dispatchability? First, consider the fact that not all renewables are intermittent. While the U.S. does not intend to add much more hydro, it is an existing source of baseload energy, currently generating 6% of our needs. Solar thermal with molten storage, biogas, biomass (especially cleaner electro and biochemical biomass) and geothermal all provide baseload sources of energy.

Wind and solar become highly dispatchable with storage. Fortunately, storage prices are dropping rapidly. Vanadium flow batteries are already viable options. LI-ion batteries are running at more than 90 percent efficiency. Tesla’s gigafactory is expected to cut costs 30 percent by 2020, and $100/kWh prices are expected within the next 10 years — perhaps sooner. There’s a startup company called Sakti3 that developed a less expensive solid state LI-ion battery — and they start manufacturing this year. Additional options included various methods utilizing hydrogen. All are technically and economically realistic.

It’s usually those in the pro nuclear or fossil fuel camps that cite intermittency as the key issue with renewables. I find it ironic, that those who have even a fundamental understanding of nuclear, can’t seem to find answers to relatively simple problems. Compare and contrast the difficulties of fission, handling nuclear waste, building dozens of nuclear plants simultaneously, along with the costs — to solving intermittency. In other words, humans can construct highly complex reactors, prepare fuel, split atoms and manage radioactive waste, all of which require immense short and long-term financial investments, yet we can not utilize various storage techniques, generation diversity and a smarter grid? Obviously, we can, and we will.

Decarbonization: Risk Versus Reward

Why not build nuclear AND renewables? The fact that renewable generation is outpacing nuclear in China is significant because China is currently the most aggressive with their nuclear ambitions — yet, they are building renewables even faster. This raises a question: what if China used the labor, resources and money towards an all-renewable approach? Yes, nuclear and renewables can be built together to help with decarbonization, but, a renewables only approach can also work, technically and economically. Could an all renewables solution be a better approach to decarbonization? Is it technically possible?

Economics, both from the perspectives of the utilities and consumers, are really driving the push for renewables over nuclear. In addition to the points above, consider Areva’s financials (along with their statements), their push into renewables and also Siemens exit from the nuclear industry. On the utilities side, they are the ones that ultimately decide how to procure power, and they are the ones that are choosing renewables. Even in Texas, the land of Ted Cruz, places like Georgetown are now 100 percent powered by wind and solar.

The other key factors boil down to safety and security. When things go wrong at a nuclear plant, due to accidents, terrorists or nature, they can go very wrong. The damage can cripple or destroy a city and even a Nation. Is it likely? Who really knows for sure. Can you predict the next earthquake in Southern California — or anywhere in the U.S. or Japan or the rest of the world? What about the next tsunami wiping out a coastline? What about the next cyberattack or terrorist organization in the Middle East? Compare a catastrophe with a nuclear plant to that of a solar or wind farm. When you ask me why I am against building new reactors, it’s a matter of economics, safety and security, and the fact that we CAN build upon existing hydro and nuclear with all renewables - and we can do it faster.

Coming soon — Part III: Can a country run on 100 percent renewables with storage at current electric rates? Spoiler alert — YES! Intermittency, dispatchability, renewable diversity and more will be covered in my next article. In the meantime, please feel free comment below.

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