# Cost of electricity by source

(Redirected from Relative cost of electricity generated by different sources)
For the price of electricity, see Electricity pricing.
LCOE comparison of renewable technologies and conventional power plants in euro per kWh.

The cost of electricity (typically cents/kWh, euro/kWh, euro or $/MWh) generated by different sources is a calculation of the cost of generating electricity at the point of connection to a load or electricity grid. It includes the initial capital, discount rate, as well as the costs of continuous operation, fuel, and maintenance. This type of calculation assists policy makers, researchers and others to guide discussions and decision making. ## Cost factors The National Renewable Energy Laboratory projects that the levelized cost of wind power will decline about 25% from 2012 to 2030.[1] Projected levelised cost of solar PV generation per kWh in Europe.[2] While calculating costs, several internal cost factors have to be considered.[3] (Note the use of "costs," which is not the actual selling price, since this can be affected by a variety of factors such as subsidies and taxes): • Capital costs (including waste disposal and decommissioning costs for nuclear energy) - tend to be low for fossil fuel power stations; high for wind turbines, solar PV; very high for waste to energy, wave and tidal, solar thermal, and nuclear. • Fuel costs - high for fossil fuel and biomass sources, low for nuclear, and zero for many renewables. • Factors such as the costs of waste (and associated issues) and different insurance costs are not included in the following: Works power, own use or parasitic load - that is, the portion of generated power actually used to run the stations pumps and fans has to be allowed for. To evaluate the total cost of production of electricity, the streams of costs are converted to a net present value using the time value of money. These costs are all brought together using discounted cash flow.[4][5] ## Calculations See also: Grid parity Levelized Energy Cost (LEC, also known as Levelized Cost of Energy, abbreviated as LCOE[6]) is the price at which electricity must be generated from a specific source to break even over the lifetime of the project. It is an economic assessment of the cost of the energy-generating system including all the costs over its lifetime: initial investment, operations and maintenance, cost of fuel, cost of capital, and is very useful in calculating the costs of generation from different sources. It can be defined in a single formula as:[7] $\mathrm{LEC} = \frac{\sum_{t=1}^{n} \frac{ I_t + M_t + F_t}{\left({1+r}\right)^t} }{\sum_{t=1}^{n} \frac{E_t}{\left({1+r}\right)^{t}} }$ where • $\mathrm{LEC}$ = Average lifetime levelized electricity generation cost • $I_t$ = Investment expenditures in the year t • $M_t$ = Operations and maintenance expenditures in the year t • $F_t$ = Fuel expenditures in the year t • $E_t$ = Electricity generation in the year t • $r$ = Discount rate • $n$ = Life of the system Typically LECs are calculated over 20 to 40 year lifetimes, and are given in the units of currency per kilowatt-hour, for example AUD/kWh or EUR/kWh or per megawatt-hour, for example AUD/MWh (as tabulated below).[8] However, care should be taken in comparing different LCOE studies and the sources of the information as the LCOE for a given energy source is highly dependent on the assumptions, financing terms and technological deployment analyzed.[8] In particular, assumption of capacity factor has significant impact on the calculation of LCOE. For example, Solar PV may have a capacity factor as low as 10% depending on location. Thus, a key requirement for the analysis is a clear statement of the applicability of the analysis based on justified assumptions.[9] ### System boundaries When comparing LECs for alternative systems, it is very important to define the boundaries of the 'system' and the costs that are included in it. For example, should transmissions lines and distribution systems be included in the cost? Typically only the costs of connecting the generating source into the transmission system is included as a cost of the generator. But in some cases wholesale upgrade of the Grid is needed. Careful thought has to be given to whether or not these costs should be included in the cost of power. Should R&D, tax, and environmental impact studies be included? Should the costs of impacts on public health and environmental damage be included? Should the costs of government subsidies be included in the calculated LEC? ### Discount rate Another key issue is the decision about the value of the discount rate $r$. The value that is chosen for $r$ can often 'weigh' the decision towards one option or another, so the basis for choosing the discount must clearly be carefully evaluated. See internal rate of return. A UK government study in 2011 concluded that the appropriate discount rate to analyse UK government programs was not the actual cost of capital, but 3.5%.[10] ### Marginal cost of electricity A more telling economic assessment might be the marginal cost of electricity. This value would serve the purpose of comparing the added cost of increasing electricity generation by one unit from different sources of electricity generation (see Merit Order). ### Avoided cost The US Energy Information Administration has cautioned that levelized costs of non-dispatchable sources such as wind or solar should be compared to the avoided energy cost rather than the levelized cost of dispatchable sources such as fossil fuels or geothermal. This is because introduction of fluctuating power sources may or may not avoid capital and maintenance costs of backup dispatchable sources.[11] ## Estimates ### US Department of Energy estimates The tables below list the estimated cost of electricity by source for plants entering service in 2018. The tables are from a January 2014 report of the Energy Information Administration (EIA) of the U.S. Department of Energy (DOE) called "Levelized Cost of New Generation Resources in the Annual Energy Outlook 2014".[12] • Total System Levelized Cost (the rightmost column) gives the dollar cost per megawatt-hour that must be charged over time in order to pay for the total cost. These calculations reflect an adjustment to account for the high level of carbon dioxide produced by coal plants. From the EIA report: "a 3-percentage point increase in the cost of capital is added when evaluating investments in greenhouse gas (GHG) intensive technologies like coal-fired power and coal-to-liquids (CTL) plants without carbon control and sequestration (CCS). While the 3-percentage point adjustment is somewhat arbitrary, in levelized cost terms its impact is similar to that of a$15 per metric ton of carbon dioxide (CO2) emissions fee. ... As a result, the levelized capital costs of coal-fired plants without CCS are higher than would otherwise be expected."[13]

No tax credits or incentives are incorporated in the tables. From the EIA report (emphasis added):

"Levelized cost ... represents the per-kilowatthour cost (in real dollars) of building and operating a generating plant over an assumed financial life and duty cycle. Key inputs to calculating levelized costs include overnight capital costs, fuel costs, fixed and variable operations and maintenance (O&M) costs, financing costs, and an assumed utilization rate for each plant type/. ... The availability of various incentives, including state or federal tax credits, can also impact the calculation of levelized cost. The values shown in the tables in this discussion do not incorporate any such incentives."[12]

All generating types are assumed to have the same 30-year cost recovery period, regardless of the expected lifetime of the plant. From the EIA report:

"The levelized cost shown for each utility-scale generation technology in the tables in this discussion are calculated based on a 30-year cost recovery period, using a real after tax weighted average cost of capital (WACC) of 6.6 percent. I"[12]

Incentives, tax credits, production mandates, etc. are discussed in the overall comprehensive EIA report: "Annual Energy Outlook 2012".[14][15][16]

Photovoltaics (solar PV) can be used both by distributed residential or commercial users and utility scale power plants. The costs shown are for utility scale photovoltaic power plants.[17]

Estimated Levelized Cost of New Generation Resources, 2019[13]
U.S. Average Levelized Cost for Plants Entering Service in 2019
(2012 USD/MWh)
Plant TypeCapacity
Factor
(%)
Levelized
Capital
Cost
Fixed
O&M
Variable
O&M
(including
fuel)
Transmission
Investment
Total
System
Levelized
Cost
Conventional Coal8560.04.230.31.295.6
Integrated Coal-Gassification Combined Cycle (IGCC8576.16.931.71.2115.9
IGCC with CCS8597.89.838.61.2147.4
Natural Gas Fired
NG: Conventional Combined Cycle8714.31.749.11.266.3
NG: Conventional Combustion Turbine3040.22.882.03.4128.4
Geothermal9234.212.20.01.447.9
Biomass8347.414.539.51.2102.6
Wind13564.113.00.03.280.3
Wind - Offshore137175.422.80.05.8204.1
Solar PV1,225114.511.40.04.1130.0
Solar Thermal120195.042.10.06.0243.1
Hydro15372.04.16.42.084.5
1Non-dispatchable (Hydro is dispatchable within a season, but nondispatchable overall-limited by site and season)
2Costs are expressed in terms of net AC power available to the grid for the installed capacity
Regional Variation in Levelized Costs of New Generation Resources, 2019[14]
Plant TypeRange for Total System Levelized Costs
(2010 USD/MWh)
MinimumAverageMaximum
Conventional Coal87.095.6114.4
IGCC106.4112.2131.5
IGCC with CCS137.3147.4163.3
Natural Gas Fired
Conventional Combined Cycle61.166.375.8
Conventional Combustion Turbine106.0128.4149.4
Geothermal46.247.950.3
Biomass92.3102.6122.9
Wind71.380.390.3
Wind-Offshore168.7204.1271.0
Solar PV101.4130.0200.9
Solar Thermal176.8243.1388.0
Hydro[18]61.684.5137.7

### OpenEI Database

OpenEI, sponsored jointly by the US DOE and the National Renewable Energy Laboratory, has compiled a historical cost-of-generation database[19] covering a wide variety of generation sources. Because the data is open source it may be subject to frequent revision.

OpenEI Transparent Cost Database
Plant TypeLevelized Cost of
Energy (USD/MWh)
Overnight
Capital Cost
(1000xUSD/kW)
Fixed
Operating Cost
(USD/kW)
Variable
Operating Cost
(USD/MWh)
Capacity
Factor (%)
MaxMedianMinMaxMedianMinMaxMedianMinMaxMedianMinMaxMedianMin
Wind, onshore12060202.601.571.1360.0010.9510.95236.455.0250.43818.4
Wind, offshore200100708.003.052.1618014.2814.284021.1813544327
Solar PV5902801509.505.102.5011032.036.44000282115.48
Solar CSP300200608.095.743.2014255.727.8025.50.10.106531.1621.84
Geothermal Hydrothermal14060405.942.821.63229155.4168.33000958575
Blind Geothermal1006.85222.9800095
Enhanced Geothermal130130607.257.001.78199.69199.69134.05403059584.680
Small Hydropower1404.5013000050
Hydropower12020204.001.320.507513.1412.725.943.202.4293.293.235
Ocean23022021011.346.004.5010000025.5
Biopower17070107.662.620.36369.2866.6312.0029.124.61.018584.0475
Distributed Generation480140509.801.801.318016.5816.03517.377.1275
Fuel Cell1501501407.004.643.808505.655.5047.9247.925.7895
Natural Gas Combined Cycle7050101.680.880.5145.6013.715.508.092.861.299384.640
Natural Gas Combustion Turbine11070608.095.743.2014.5210.535.2629.903.572.67928010
Coal, pulverized, scrubbed12050108.401.920.5633.6027.5013.085.903.701.629384.680
Coal, pulverized, unscrubbed4040405.014.453.9484.6
Coal, integrated gasification
combined cycle
180806011.003.172.22130.0338.6725.0011.127.251.1580.9680.9675
Nuclear12060408.203.102.2812785.6612.806.00.49.4290.249085

### Germany 2013 estimates

In November 2013, a new report on Germany levelised generation costs was published by FRAUNHOFER.[20] PV power plants reached LCOE between 0.078 and 0.142 Euro/kWh in the third quarter of 2013, depending on the type of power plant (ground-mounted utility-scale or small rooftop power plant) and insolation (1000 to 1200 kWh/m²a GHI in Germany). New nuclear power is not considered as an option anymore.

Germany energy costs for different generation technologies in EUR per megawatt hour (2013)
TechnologyCost range (EUR/MWh)
brown coal38-53
hard coal63–80
CCGT power plants75-98
onshore wind45-107
offshore wind119–194
PV power plants78-142
biogas135–250

### UK 2010 estimates

In March 2010, a new report on UK levelised generation costs was published by Parsons Brinckerhoff.[21] It puts a range on each cost due to various uncertainties. Combined cycle gas turbines without CO2 capture are not directly comparable to the other low carbon emission generation technologies in the PB study. The assumptions used in this study are given in the report.

UK energy costs for different generation technologies in pounds per megawatt hour (2010)
TechnologyCost range (£/MWh)[citation needed]
New nuclear80–105 (92.50 guaranteed from 2023[22][23])
Onshore wind80–110
Biomass60–120
Natural gas turbines with CO2 capture60–130
Coal with CO2 capture100–155
Solar farms125–180
Offshore wind150–210
Natural gas turbine, no CO2 capture55–110
Tidal power155–390

Divide the above figures by 10 to obtain the price in pence per kilowatt-hour.

More recent UK estimates are the Mott MacDonald study released by DECC in June 2010 [24] and the Arup study for DECC published in 2011.[25]

### French 2011 estimates

The International Agency for the Energy and EDF have estimated for 2011 the following costs. For the nuclear power they include the costs due to new safety investments to upgrade the French nuclear plant after the Fukushima Daiichi nuclear disaster; the cost for those investments is estimated at 4 €/MWh. Concerning the solar power the estimate at 293 €/MWh is for a large plant capable to produce in the range of 50-100 GWh/year located in a favorable location (such as in Southern Europe). For a small household plant capable to produce typically around 3 MWh/year the cost is according to the location between 400 and 700 €/MWh. Currently solar power is by far the most expensive renewable source to produce electricity, although increasing efficiency and longer lifespan of photovoltaic panels together with reduced production costs could make this source of energy more competitive.

French energy costs for different generation technologies in Euros per megawatt hour (2011)
TechnologyCost (€/MWh)
Hydro power20
Nuclear (with State-covered insurance costs)50
Natural gas turbines without CO2 capture61
Onshore wind69
Solar farms293

### Analysis from different sources

 █ Conventional oil █ Unconventional oil █ Biofuels █ Coal █ Nuclear █ Wind Colored vertical lines indicate various historical oil prices. From left to right: — 1990s average — January 2009 — 1979 peak — 2008 peak

Price of oil per barrel (bbl) at which energy sources are competitive.

• Right end of bar is viability without subsidy.
• Left end of bar requires regulation or government subsidies.
• Wider bars indicate uncertainty.
Source: Financial Times (edit)

A draft report of LECs used by the California Energy Commission is available.[26] From this report, the price per MWh for a municipal energy source is shown here:

California levelized energy costs for different generation technologies in US dollars per megawatt hour (2007)

## External costs of energy sources

Typically pricing of electricity from various energy sources may not include all external costs - that is, the costs indirectly borne by society as a whole as a consequence of using that energy source. These may include enabling costs, environmental impacts, usage lifespans, energy storage, recycling costs, or beyond-insurance accident effects.

The US Energy Information Administration predicts that coal and gas are set to be continually used to deliver the majority of the world's electricity,[41] this is expected to result in the evacuation of millions of homes in low lying areas, and an annual cost of hundreds of billions of dollars' worth of property damage.[42][43][44][45][46][47][48]

Furthermore, with a number island nations becoming slowly submerged underwater due to rising sea levels,[49] massive international climate litigation lawsuits against fossil fuel users are currently beginning in the International Court of Justice.[50][51]

An EU funded research study known as ExternE, or Externalities of Energy, undertaken over the period of 1995 to 2005 found that the cost of producing electricity from coal or oil would double over its present value, and the cost of electricity production from gas would increase by 30% if external costs such as damage to the environment and to human health, from the particulate matter, nitrogen oxides, chromium VI, river water alkalinity, mercury poisoning and arsenic emissions produced by these sources, were taken into account. It was estimated in the study that these external, downstream, fossil fuel costs amount up to 1%-2% of the EU’s entire Gross Domestic Product (GDP), and this was before the external cost of global warming from these sources was even included.[52][53]

Nuclear power has largely worked under an insurance framework that limits or structures accident liabilities in accordance with the Paris convention on nuclear third-party liability, the Brussels supplementary convention, and the Vienna convention on civil liability for nuclear damage[54] and in the U.S. the Price-Anderson Act. It is often argued that this potential shortfall in liability represents an external cost not included in the cost of nuclear electricity.

However these beyond-insurance costs for worst-case scenarios are not unusual to nuclear power, as hydroelectric power plants are similarly not fully insured against a catastrophic event such as the Banqiao Dam disaster, where 11 million people lost their homes and from 30,000 to 200,000 people died, or large dam failures in general. As private insurers base dam insurance premiums on limited scenarios, major disaster insurance in this sector is likewise provided by the state.[55] Also of note is that more modern reactors than those of the Fukushima Daiichi Nuclear Power Plant vintage, such as the proven Onagawa nuclear plant design,[56] demonstrated that it can survive 13 meter high tsunamis and safely shut down without incident, despite being the closest nuclear plant to the epicenter of the 2011 earthquake and tsunami.[56]

## Photovoltaics

Price history of silicon PV cells since 1977

Photovoltaic prices have fallen from $76.67 per watt in 1977 to an estimated$0.36 per watt in 2014, for crystalline silicon solar cells.[57][58] This is seen as evidence supporting Swanson's law, an observation similar to the famous Moore's Law, that states that solar cell prices fall 20% for every doubling of industry capacity.

However, cost per watt is a poor way to compare actual life-cycle costs of energy sources, as explained above.

By 2011, the price of PV modules per MW had fallen by 60% since 2008, according to Bloomberg New Energy Finance estimates, putting solar power for the first time on a competitive footing with the retail price of electricity in some sunny countries; an alternative and consistent price decline figure of 75% from 2007 to 2012 has also been published,[59] though it is unclear whether these figures are specific to the United States or generally global. The levelised cost of electricity (LCOE) from PV is competitive with conventional electricity sources in an expanding list of geographic regions,[8] particularly when the time of generation is included, as electricity is worth more during the day than at night.[60] There has been fierce competition in the supply chain, and further improvements in the levelised cost of energy for solar lie ahead, posing a growing threat to the dominance of fossil fuel generation sources in the next few years.[61] As time progresses, renewable energy technologies generally get cheaper,[62][63] while fossil fuels generally get more expensive:

The less solar power costs, the more favorably it compares to conventional power, and the more attractive it becomes to utilities and energy users around the globe. Utility-scale solar power can now be delivered in California at prices well below $100/MWh ($0.10/kWh) less than most other peak generators, even those running on low-cost natural gas. Lower solar module costs also stimulate demand from consumer markets where the cost of solar compares very favorably to retail electric rates.[64]

It is now evident that, given a carbon price of $50/ton, which would raise the price of coal-fired power by 5c/kWh, solar PV, Wind, and Nuclear will be cost-competitive in most locations. The declining price of PV has been reflected in rapidly growing installations, totaling about 23 GW in 2011. Although some consolidation is likely in 2012, due to support cuts in the large markets of Germany and Italy, strong growth seems likely to continue for the rest of the decade. Already, by one estimate, total investment in renewables for 2011 exceeded investment in carbon-based electricity generation.[65] In the case of self consumption, payback time is calculated based on how much electricity is not brought from the grid. Additionally, using PV solar power to charge DC batteries, as used in Plug-in Hybrid Electric Vehicles and Electric Vehicles, leads to greater efficiencies, but higher costs. Traditionally, DC generated electricity from solar PV must be converted to AC for buildings, at an average 10% loss during the conversion. An additional efficiency loss occurs in the transition back to DC for battery driven devices and vehicles, and using various interest rates and energy price changes were calculated to find present values that range from$2,057.13 to \$8,213.64 (analysis from 2009).[66]

Calculations often do not include wider system costs associated with each type of plant, such as long distance transmission connections to grids, or balancing and reserve costs. Calculations do not include externalities such as health damage by coal plants, nor the effect of CO2 emissions on the climate change, ocean acidification and eutrophication, ocean current shifts. Decommissioning costs of nuclear plants are usually not included (The USA is an exception, because the cost of decommissioning is included in the price of electricity, per the Nuclear Waste Policy Act), is therefore not full cost accounting. These types of items can be explicitly added as necessary depending on the purpose of the calculation. It has little relation to actual price of power, but assists policy makers and others to guide discussions and decision making.[citation needed]

These are not minor factors but very significantly affect all responsible power decisions:

• Comparisons of life-cycle greenhouse gas emissions show coal, for instance, to be radically higher in terms of GHGs than any alternative. Accordingly, in the analysis below, carbon captured coal is generally treated as a separate source rather than being averaged in with other coal.
• Other environmental concerns with electricity generation include acid rain, ocean acidification and effect of coal extraction on watersheds.
• Various human health concerns with electricity generation, including asthma and smog, now dominate decisions in developed nations that incur health care costs publicly. A Harvard University Medical School study estimates the US health costs of coal alone at between 300 and 500 billion US dollars annually.[67]
• While cost per kWh of transmission varies drastically with distance, the long complex projects required to clear or even upgrade transmission routes make even attractive new supplies often uncompetitive with conservation measures (see below), because the timing of payoff must take the transmission upgrade into account.

 Energy portal Renewable energy portal

## References

1. ^ E. Lantz, M. Hand, and R. Wiser (May 13–17, 2012) "The Past and Future Cost of Wind Energy," National Renewable Energy Laboratory conference paper no. 6A20-54526, page 4
2. ^ Source:EPIA, Solar Photovoltaics Competing in the Energy Sector, W. Hoffmann, September 2011 [1]
3. ^ A Review of Electricity Unit Cost Estimates Working Paper, December 2006 - Updated May 2007
4. ^ "Cost of wind, nuclear and gas powered generation in the UK". Claverton-energy.com. Retrieved 2012-09-04.
5. ^ "David Millborrows paper on wind costs". Claverton-energy.com. Retrieved 2012-09-04.
6. ^ LCOE definition on NREL website [2]
7. ^ Nuclear Energy Agency/International Energy Agency/Organization for Economic Cooperation and Development Projected Costs of Generating Electricity (2005 Update)
8. ^ a b c K. Branker, M. J.M. Pathak, J. M. Pearce, “A Review of Solar Photovoltaic Levelized Cost of Electricity”, Renewable & Sustainable Energy Reviews 15, pp.4470-4482 (2011). Open access
9. ^ A recent review on the subject stating reporting requirements and clearing up misconceptions about inputs : A Review of Solar Photovoltaic Levelized Cost of Electricity, Renewable and Sustainable Energy Reviews, 15, pp.4470-4482 (2011)
10. ^
11. ^ US Energy Information Administration, Levelized cost of new generation resources, 28 January 2013.
12. ^ a b c [3] Levelized Cost of New Generation Resources in the Annual Energy Outlook 2014]. Released April, 2014. Report of the US Energy Information Administration (EIA) of the U.S. Department of Energy (DOE).
13. ^ a b [4] Levelized Cost of New Generation Resources in the Annual Energy Outlook 2013]. Released January, 2013. Report of the US Energy Information Administration (EIA) of the U.S. Department of Energy (DOE).
14. ^ a b Energy Information Administration, Annual Energy Outlook 2012. June 2012, DOE/EIA-0383(2012).
15. ^
16. ^
17. ^ Levelized Cost of New Generation Resources in the Annual Energy Outlook 2011. Released January 23, 2012. Report of the US Energy Information Administration (EIA) of the U.S. Department of Energy (DOE).
18. ^ http://www.eia.gov/forecasts/aeo/electricity_generation.cfm
19. ^ OpenEI Transparent Cost Database. Accessed 09/02/2013.
20. ^ "Levelized cost of electricity renewable energy technologies". FRAUNHOFER. 2013. Retrieved 6 May 2014.
21. ^ "Powering the Nation". Parsons Brinckerhoff. 2010. Retrieved 16 February 2012.
22. ^ "UK nuclear power plant gets go-ahead". BBC News. 21 October 2013.
23. ^ Roland Gribben and Denise Roland (21 October 2013). "Hinkley Point nuclear power plant to create 25,000 jobs, says Cameron". London: Daily Telegraph.
24. ^ "Mott MacDonald study released by DECC in June 2010" (PDF). Retrieved 2012-09-04.
25. ^ Ove Arup & Partners Ltd (October 2011). "Review of the generation costs and deployment potential of renewable electricity technologies in the UK" (PDF). London: Department of Energy and Climate Change. Retrieved 16 February 2012.
26. ^ "Comparative Costs of California Central Station Electricity Generation Technologies" (PDF). Retrieved 2012-09-04.
27. ^ Graham, P. The heat is on: the future of energy in Australia CSIRO, 2006
28. ^ a b c Switkowski, Z. Uranium Mining, Processing and Nuclear Energy Review UMPNER taskforce, Australian Government, 2006
29. ^ Johnston, Eric, "Son's quest for sun, wind has nuclear interests wary", Japan Times, 12 July 2011, p. 3.
30. ^ Bird, Winifred, "Powering Japan's future", Japan Times, 24 July 2011, p. 7.
31. ^ Johnston, Eric, "Current nuclear debate to set nation's course for decades", Japan Times, 23 September 2011, p. 1.
32. ^
33. ^ Claverton Energy Group conference House of Commons, 19 June 2009
34. ^ "Institution of Engineers and Shipbuilders in Scotland report" (PDF). Retrieved 2012-09-04.
35. ^ "Institution of Engineers and Shipbuilders in Scotland data". Iesisenergy.org. Retrieved 2012-09-04.
36. ^ a b "System effects in low carbon energy systems". OECD, NEA. Retrieved 2013-04-04.
37. ^ http://blog.environmentalresearchweb.org/2013/05/18/nuclear-renewables-backupgrid/ environmentalresearchweb.org - Nuclear and renewables: back-up and grid costs
38. ^ https://www.ieawind.org/task_25/PDF/HomePagePDF's/NEA%20system%20costs%20response%20IEA_WIND_Task_25_2012.pdf VTT Technical Research Centre of Finland - Note for wind energy grid level system costs published by NEA 2012 report
39. ^ http://kth.diva-portal.org/smash/record.jsf?searchId=1&pid=diva2:579536
40. ^ http://kth.diva-portal.org/smash/get/diva2:579536/FULLTEXT01.pdf Nuclear Energy and Renewables: System Effects in Low‐carbon Electricity Systems - Method comments to a NEA report, p. 24
41. ^ International Energy Outlook: Electricity "Although coal-fired generation increases by an annual average of only 1.9 percent, it remains the largest source of electricity generation through 2035. In 2008, coal-fired generation accounted for 40 percent of world electricity supply; in 2035, its share decreases to 37 percent, as renewables, natural gas, and nuclear power all are expected to advance strongly during the projection and displace the need for coal-fired-generation in many parts of the world. World net coal-fired generation grows by 67 percent, from 7.7 trillion kilowatthours in 2008 to 12.9 trillion kilowatthours in 2035."
42. ^ The economic impact of global warming
43. ^ Climate change threatens Australia's coastal lifestyle, report warns | Environment | The Guardian
44. ^ Tufts Civil Engineer Predicts Boston’s Rising Sea Levels Could Cause Billions Of Dollars In Damage
45. ^ Rising Sea Levels' cost on Boston
46. ^ Tufts University slide 28, note projected Bangladesh evacuation
47. ^ The Hidden costs of Fossil fuels
48. ^ Rising Sea Level
49. ^ Five nations under threat from climate change
50. ^ Tiny Pacific nation takes on Australia
51. ^ See you in court: the rising tide of international climate litigation
52. ^ New research reveals the real costs of electricity in Europe
53. ^
54. ^
55. ^
56. ^ a b "Japanese nuclear plant survived tsunami, offers clues". Reuters. 20 October 2011.
57. ^ "Price Quotes". http://pv.energytrend.com/. Archived from the original on 26 June 2014. Retrieved 26 June 2014.
58. ^ "Sunny Uplands: Alternative energy will no longer be alternative". The Economist. 21 November 2012. Retrieved 2012-12-28.
59. ^ Ken Wells (October 25, 2012), "Solar Energy Is Ready. The U.S. Isn't", Bloomberg Businessweek, businessweek.com, retrieved November 1, 2012
60. ^ Utilities’ Honest Assessment of Solar in the Electricity Supply
61. ^ "Renewables Investment Breaks Records". Renewable Energy World. 29 August 2011.
62. ^ Renewable energy costs drop in '09 Reuters, November 23, 2009.
63. ^ Solar Power 50% Cheaper By Year End – Analysis Reuters, November 24, 2009.
64. ^ Arno Harris (31 August 2011). "A Silver Lining in Declining Solar Prices". Renewable Energy World.
65. ^ John Quiggin (January 3, 2012). "The End of the Nuclear Renaissance |". National Interest.
66. ^ Converting Solar Energy into the PHEV Battery "VerdeL3C.com", May 2009
67. ^ "New Harvard Study Examines Cost of Coal". Environment.harvard.edu. Retrieved 2012-09-04.