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Financial Cases and Methods

Financial assumptions impact the levelized cost of energy (LCOE) by changing the cost of capital needed to finance electricity generation projects. The equations and variables used to estimate LCOE are defined on the Equations and Variables page.

This section of the Annual Technology Baseline (ATB) focuses on the input variables to the weighted average cost of capital (WACC), which is used in the ATB as the discount rate input to the capital recovery factor for the LCOE formula. The capital recovery factor and the project finance factor determine the fixed charge rate, which incorporates other elements of project finance including the following: 

  • Combined federal and state tax rate
  • Depreciation schedule of the asset
  • Average inflation rate
  • Tax incentives.

Incorporating these elements means the LCOE presented in the ATB is pretax. Because the elements mentioned above are fixed or would require changes to legislation, the discussion on this page focuses on the variables in WACC.

Financial Assumptions Cases

Two cases with differing project finance assumptions are used within the ATB:

  • Financing structure without tax incentives based on long-term averages: LCOE improvement is therefore based on research and development (R&D) improvements alone (R&D Only Case).
  • Market + Policies Financial Assumptions Case, in which there are market and policy changes (Market + Policies Case).

Use the following chart to explore the differences between the two financial assumptions cases.

LCOE by technology and financial assumptions case

To explore the effect of financial assumptions on LCOE, select a technology and financial assumptions case.

Financial parameters by technology and financial assumptions case

To explore the financial assumptions, select a financial parameter (interest rate, rate of return, capital recovery factor, debt fraction, and WACC), technology, and financial assumptions case.

The R&D Only Case, the Market + Policies Case, and the methodology and assumptions are as follows:

  • R&D Only Case
    • Estimates technology-specific debt interest rates, return on equity rates, and debt fraction to reflect technological risk perception but with consistent assumptions around sources of capital and ownership across technologies (i.e., independent power producer, financed with a tax equity partnership)
    • Holds tax and inflation rates constant at assumed long-term values: 21% federal tax rate, 6% state tax rate (though actual state tax rates vary), and 2.5% inflation rate
    • Excludes effects of tax credits.
  • Market + Policies Case
    • Retains the technology-specific return on equity rates developed in the R&D Only Case
    • Modifies the average inflation rate over the life of the project to account for recent inflation
    • Applies federal tax credits and expires them consistent with existing law and guidelines.
  • General Methodology and Assumptions
    • Renewable Generators: Projects with financing terms are owned by independent power producers (IPPs) that have entered into long-term, fixed-price, take-or-pay power purchase agreements (PPAs) for the sale of the electricity. Though PPAs are not the only possible arrangement, they are the dominant form of asset ownership and electricity offtake for new renewable energy assets in the United States.
    • Financing Structure: Financial structures for IPP-owned projects are assumed to use a tax equity partnership and debt. Tax equity arrangements are a popular financing technique. They generally offer lower-cost equity than sponsor equity for a portion of the cost project costs in exchange for the associated tax benefits because not all companies can use all the tax benefits.
    • Conventional Generators: Natural gas plants represent most of all recently installed conventional electricity generation and therefore represent "typical" financial transactions and financing terms. Financing terms reflect natural gas electric generation projects also owned by IPPs that sell power through either a short-term contract or a wholesale spot electricity market, which are otherwise known as quasi-merchant projects. Natural gas plants in unregulated markets have not historically entered into electricity price contracts of the same length as renewable energy generation assets for a variety of reasons, including the challenges of fuel price hedging or contracting for more than a few years. 
    • Risk Assessment: Financial assumptions reflect the different terms offered by financiers to projects with varying levels of risk. Although we recognize in practice these risks may also be reflected in capital expenditures (CAPEX), in soft costs, in a contingency fund, or elsewhere, we believe reflecting risk in the financing terms provides the clearest and most consistent approach. Therefore, we use technology-specific debt interest rates, returns on equity, and debt fractions as a percentage of the total project to reflect technological risk perception. Debt fraction is calculated using a separate financial model, with technology-specific ATB inputs, based on technology-specific assumed debt service coverage ratios (DSCRs).
    • Domestic Focus: Assumptions primarily reflect technology risk within the U.S. market, but some consideration is given to international development. An individual technology may receive more-favorable financing terms outside the United States as a result of different macroeconomic factors (e.g., different regulations or different interest rates), more government interventions or more market guarantees, or better market perception of technologies.
    • Constant Technology Risk: Assumptions reflect no change in underlying risk perception for all technologies over time. The modeled renewable technologies have globally deployed billions of dollars in CAPEX and currently receive more-favorable financing terms than other electric generation technologies. Though there is still opportunity for further risk perception reduction, because the cost of capital is so favorable, we assume a reduction in risk would likely result in higher leverage―providing equity investors with higher returns (which might have a neutral impact on the overall cost of capital) or electricity offtake agreements that are currently considered riskier than long-term PPAs (i.e., selling electricity into wholesale markets). It should be noted even if the reduction of risk does not lower cost, it could increase adoption by opening more markets and opportunities. At the same time, the differences in risk between technologies reflect underlying technology risks of construction and operation.
    • Cost Recovery Period: Both cases assume a constant cost recovery period―or period over which the initial capital investment is recovered―of 30 years for all technologies. The ATB also provides an option to look at cost recovery over a 20-year period, and a "tech life" period in which the lifetime varies by technology.

Methods for Developing Financial Assumptions

This approach to generating the financial assumptions includes technology-specific financial assumptions to 1) capture more granularity of current and future energy markets and 2) show changes in financing rates that are attributable to the reduction or elimination of tax credits for eligible technologies (see below for schedule reductions). Each technology has specific risk factors that might influence the underlying cost of financing. However, a multitude of other factors determines a project's cash flow risk, including the following:

  • Political risk
  • Regulatory uncertainty
  • Project development risk (i.e., risks associated with project cost overruns or the project being behind schedule or not completed at all)
  • Government support (if any)
  • Ownership risk, including creditworthiness (IPP versus investor-owned utility versus public utility)
  • Creditworthiness of the electricity offtaker and the length of the contract (if any)
  • Whether the electricity price is firm or changes with the market
  • Supply and demand of competing electricity and sources of financing (plants with electricity contracts can still be exposed to supply-and-demand risk if financing is at all tied to value after the end of a contract or any risks associated with curtailment)
  • Underlying inflation rate and the cost of the base rate (e.g., London Inter-Bank Offered Rate, or LIBOR).

Also, some projects might receive more-favorable financing because of the economies of scale of closing a financial transaction (e.g., it does not take twice the effort to perform financial due diligence on a project that is twice the price). There is also a wider pool of investors with larger projects because some investors have minimum investment thresholds. For these reasons, there is a wide range in financing costs across the United States―and the world―even for the same technology. Long-term PPAs used by renewable energy projects avoid many of the financial risks associated with electricity offtake and price uncertainty. Financing terms for conventional energy generation reflect natural gas electric generation projects owned by IPPs that sell power through short-term contracts or through a wholesale spot electricity market―otherwise known as quasi-merchant projects. 

We collect data from a variety of sources that have exposure to different renewable energy technology financing, both in the United States and abroad. In doing so, we try to accurately represent typical financing costs for each technology as well as the differences, if any, between technologies. We collect data points for the following:

  • After-tax cost of levered equity during the construction and operation of the asset
  • Cost of debt during the construction and operation of the asset
  • Amount of debt provided during construction
  • Required DSCR debt providers use to determine the amount of debt (i.e., leverage) they would provide a project during the operation of the asset.

In the 2020 ATB through the 2024 ATB―unlike the 2019 ATB and earlier editions―we add the cost of equity during construction. We make this change for two reasons:

  • Construction debt providers almost always require a certain percentage of construction costs (typically the first dollars spent) to come from equity providers
  • We hope to differentiate the cost of construction financing from the cost of financing during operations.

In particular, in ATB editions before 2020, the cost of equity for geothermal plants was assumed to be much higher than that of other technologies to account for the risks during construction. By separating these two financing periods, we can lower the cost of equity for a geothermal plant during operation to bring it more in line with real-world financing terms.

Based on recent increases in the cost of capital (BloombergNEF, 2023)(Norton Rose Fulbright, 2024) as well as private discussions by National Renewable Energy Laboratory (NREL) staff with developers, the 2024 ATB has adjusted the nominal cost of equity for most technologies relative to prior years. Further documentation for differences in the cost of equity can be found in (Feldman et al., 2020) or in prior editions of the ATB.

Based on industry interviews, we include a 2% premium on the cost of equity during construction for each project―with the exception of geothermal, coal, and natural gas projects―relative to the cost of equity during plant operation to account for construction risk. Coal and natural gas do not assume a construction cost premium, but they have a leverage rate of 55%, consistent with the assumptions in (Theis, 2021). In addition, we separate the cost of equity during construction for geothermal into two stages: predrilling (assumed to be 15%) and postdrilling (with assumed site control in place, permitting completed, and a PPA contracted), with no premium on the cost of equity relative to the cost of equity during plant operation.

For interest rates, we collected data of recently issued mid- to long-term debt for renewable energy projects, summarized in the graphic below.

Sources: (Norton Rose Fulbright, 2024)(BloombergNEF, 2023)(Ormat Technologies, 2024)(Ormat Technologies, 2023)(Brookfield Renewable Partners, LP, 2022)(Brookfield Renewable Partners, LP, 2023)(LP, 2023)

As illustrated in the graphic, the median interest rate of the mid- to long-term debt increased from 4.1% to 7.0%―a 300 basis point increase, similar to the increase in Treasury Bill rates from Q1 2022 to Q2 2023. The 300 basis point increase is also consistent with the increase in interest rates assumed between the 2022 ATB and the 2023 ATB. We did not assume any change in 2024 because Treasury Bill rates have been relatively flat between Q2 2023 and Q1 2024 (U.S. Department of the Treasury, 2024). We maintain the 1% relative increase in interest rates for technologies such as natural gas from (Norton Rose Fulbright, 2024)(BloombergNEF, 2023). These rates are expected to persist through the end of the Congressional Budget Office's forecast window, so we adopt them for the entire ATB timeseries (Congressional Budget Office, 2024).

According to Norton Rose Fulbright (Norton Rose Fulbright, 2024), interest during construction is approximately 0.5% lower than term debt, which we implement for all technologies except offshore wind, geothermal, and hydropower, where there is inherently greater construction risk. 

Norton Rose Fulbright also reports P50 DSCR (for projects with long-term energy contracts) to be 1.25 for solar PV, 1.3–1.4 for land-based wind, and 2.0 for battery energy storage systems (Norton Rose Fulbright, 2024). Fitch Ratings reported hydropower plants have the same DSCR as wind projects; Ormat Technologies, which has a large portfolio of geothermal projects, reports a similar DSCR of 1.35 (Ormat Technologies, 2024). P50 represents an average level of energy production (or 50% likelihood to generate that much or more electricity), and P99 represents a production level the project has a 99% chance of exceeding. The assumed P50 DSCR, per technology, is based on collected data of P50 DSCR and is influenced by previously collected data and assumptions from (Feldman et al., 2020). Similar to the cost of equity, technologies with perceived greater operating risk from the financial community tend to have higher DSCRs. 

The following table summarizes financial assumptions by technology during the project's operation.

Financial Assumptions by Technology

 OperationConstruction
TechnologyElectricity SalesAfter-Tax Equity ReturnsInterest Rate of Term DebtDSCRAfter-Tax Equity ReturnsInterest Rate of Construction Debt Leverage
Utility PV and Utility PV + BatteryPPA8.5%7.0%1.2510.5%6.5%80%
Utility-Scale Battery Storage Market FactorsPPA9.25%7.0%2.011.25%6.5%80%
Residential and Commercial PVPPA9.5%7.0%1.2511.5%6.5%80%
Residential and Commercial Battery Storage Market FactorsPPA10.25%7.02.012.25%6.5%80%
Concentrating Solar Power (CSP)PPA10.5%7.0%1.4512.5%6.5%80%
Land-Based WindPPA9.0%7.0%1.3511.0%6.5%80%
Offshore WindPPA10.5%7.0%1.3512.5%7.0%80%
Distributed WindPPA10.0%7.0%1.3512.0%6.5%80%
GeothermalPPA10.5%7.0%1.35

Predrilling: 15%

Postdrilling: 10%

7.0%

Predrilling: 0%

Postdrilling: 75%

HydropowerPPA9.75%7.0%1.3511.75%7.0%80%
Pumped Storage HydropowerPPA10.5%7.0%1.3511.75%7.0%80%
Natural GasQuasi-merchant10.5%8.0%1.4510.5%8.0%55%
NuclearPPA10.5%8.0%1.4512.5%6.5%80%

Using the above assumptions, we run the System Advisor Model's (SAM's) leveraged partnership-flip cash flow model to calculate debt fractions. We set the internal rate of return and real discount rate equal to the nominal and real rates of return on equity (respectively) and the flip target year to Year 10 to match the expiration of the production tax credit (PTC). We assume the tax equity investor 1) provides 90% of the preflip equity and 2) receives 90% of the tax benefits and project cash. After the flip year, the tax investor receives 10% of the project cash. The resulting debt fractions are viewable above in "Financial parameters by technology and financial assumptions case."

Another important factor in determining the financial structure for a renewable energy project is the level of tax credits, if any. Below is a summary of the tax credits assumed in analysis for the 2024 ATB. We assume the tax credits will not phase out before 2050, based on 13 of 17 current policies scenarios in NREL's 2023 Standard Scenarios never reaching the Inflation Reduction Act of 2022's emissions reduction targets (Gagnon et al., 2024). Because the equity and interest rate assumptions are the same for the R&D and Markets + Policies cases, after 2032 the R&D Case can be viewed as a post-tax credit phaseout case. The tax credits assumed in ATB assume the prevailing wage rates are met and bonus credits are not received. Each bonus credit can increase the PTC and investment tax credit (ITC) by 10% whereas failing to meet the wage requirements reduces the credits by a factor of 5 (The White House, 2022). Most technologies installed in 2025 or later have the option of choosing the production tax credit or the investment tax credit; we choose the credit that minimizes LCOE for the representative plant, as shown below. Additional analysis of bonus credits and ITC versus PTC options for a particular technology can be performed with ATB-calc or the System Advisor Model.

TechnologyCredit TypeValueDuration
Land-Based WindPTC$27.50/megawatt-hour (MWh)2022–2050
Offshore WindITC30%2022–2050
Distributed WindPTC$27.50/MWh2022
ITC30%2023–2050
Utility-Scale PVITC30%2022
PTC$27.50/MWh2023–2050
Commercial PVITC30%2022–2050
Residential PVITC30%2022–2032
CSPITC30%2022–2050
GeothermalPTC$24/MWh2022
ITC30%2023–2050
HydropowerPTC$6/MWh2022
ITC30%2023–2050
Pumped Storage HydropowerITC30%2022–2050
NuclearITC30%2025–2050
BiopowerPTC$27.50/MWh2023–2050
Utility-Scale PV + BatteryITC - PV and BESS30%2022
PTC - PV$27.50/MWh2023–2050
ITC - BESS30%
Utility-Scale and Commercial Battery StorageITC30%2022–2050
Residential Battery StorageITC30%2022–2032

Assumptions for production tax credits and investment tax credits

Annual comparison of production tax credits and investment tax credits

Assumptions include that labor requirements are met but bonus credits are not included (The White House, 2022).

Based on these assumptions as well as CAPEX, fixed operation and maintenance, variable operation and maintenance, capacity factor, and fuel costs, we run financial models to calculate a technology's leverage as governed by the minimum DSCR—assuming a debt amortization schedule of 18 years (which is a common debt amortization period for U.S. renewable energy projects, even if the term of debt is shorter) (Norton Rose Fulbright, 2023) (Martin, 2019). In general, leverage varies significantly over time only because of changes to interest rate, tax rate, and the amount of tax credits received but not because of CAPEX, fixed operation and maintenance, or capacity factor. For this reason, the same leverage can be used by a technology for different resource classes. The exception to this is projects receiving the PTC (i.e., land-based wind); because PTC value represents a different percentage of project costs for different resource classes, leverage changes. A similar, but smaller, change can also be seen for natural gas, depending on fuel price. Because we cannot input different leverage values for different resource classes in the ATB (because of current programming constraints), we use the leverage for Land-Based Wind Speed Class 4-Technology 1 because it is the most common resource level for land-based wind systems. It is important to consider these relationships occur because the financial model (SAM) solves for return on equity, which will determine the electricity rate needed to achieve specific economic returns. If the financial models were to solve for economic returns, given an assumed electricity rate, the leverage on projects with higher capacity factors (all else being equal) would be greater than those with lower capacity factors. See the parameter value summary above for the calculated leverages for the ATB.

In the R&D Only Case, leverage between renewable energy technologies varies only from 69% to 74%. A certain degree of variability in leverage exists between technologies because of differences in capacity factors, return on equity, DSCR, and interest rates. In the Market + Policies case, the leverage on technologies with tax credits decreases as costs decline and then increases again when the tax credits phase out. Using these values, we calculate WACC for the different technologies, which is summarized in the parameter value summary above.

In the R&D Only Case, the nominal after-tax WACC varies from 6.01% to 8.21% for renewable energy technologies, and it is 8.0% for natural gas. A certain degree of variability in WACC exists because of underlying construction and operation risks as well as contract risk for natural gas. In the Market + Policies Case, the WACC on technologies with tax credits decreases as these credits phase out.

It is important to remember financing costs are one piece of the overall cost competitiveness of a project. Though projects receiving tax credits might have lower leverage and thus a higher WACC, they benefit from the tax credits, which overall reduces the LCOE. Likewise, Wind Speed Class 1 would have a higher WACC than Wind Speed Class 10, but that is because the cost of energy of Wind Speed Class 10 is much higher—which can support a higher modeled debt fraction. Natural gas has the highest calculated leverage, but it still has the highest WACC because of the increased cost of debt and equity (in part because it is the only technology analyzed in the ATB that does not have fully contracted cash flows). 

Looking forward, we do not assume a change to the cost of equity or DSCR because many factors might influence these variables. For example, political, corporate, or regulatory changes might push the cost of equity and DSCR higher or lower (e.g., impact the ability to get long-term contracted cash flows). The renewable energy industry is working to remove the risk and uncertainty associated with these technologies and provide more-consistent expectations of electricity production (e.g., lower failure rates, better energy production forecasting, and more-consistent resource availability through higher wind towers). However, renewable energy assets already receive favorable financing because of their ability to receive long-term fixed electricity contracts, the relative demand for green investments, and the lower-risk benefits of tax credits. Which of these factors will change in the future is unclear. Utilities might stop offering long-term contracts, or project owners might be exposed to more curtailment risk. On the other hand, with many states pushing for more carbon-free electricity, utilities might see these long-term contracts as low-cost options to satisfying these requirements; without long-term contracts, utilities might incur higher costs because of the increase in financing costs caused by shorter contracts. 

In addition, although curtailment and value loss could be more of an issue in the future as renewable energy assets make up a larger share of the total electricity generation mix, many active mitigation strategies are being developed―both by individual actors (e.g., pairing storage with renewable energy electric generation) and through larger, grid-level activities. And, although lower average DSCR—through lower risk perception—might support higher project leverage, this benefit might be counteracted by higher equity returns achieved through higher leverage. Historically, many international renewable energy projects have had slightly higher leverage and higher equity returns. For the 2020 ATB, we collected data from 174 global renewable energy projects.

Leverage of global renewable energy projects, by technology

Sources: (BNEF, forthcoming)(World Bank, 2014)(New Energy Update, 2019)(Thompson Reuters, 2018)(Thompson Reuters, 2019), and an NREL personal communication, 2020 

Although leverage varies dramatically among individual projects, the median leverage is generally around 75%, and there are no clear differences between technologies. And the differences are lessened when the projects that receive more than 80% financing through debt are removed, with the median dropping to around 70% for all technologies―which roughly matches the approximate leverage calculated for technologies in the 2024 ATB. Many of these highly leveraged projects received government, or quasi-government (e.g., World Bank), assistance in the form of nonmarket loan terms (e.g., 30-year terms), loan guarantees, or favorable credit guidelines. Many also received higher returns than projects in the United States, in the mid-teens, which allowed for even greater leverage because higher-equity returns are achieved by higher-priced electricity or other revenue streams, which allow more debt for the same DSCR. This is not to say research on risk reduction is not a critical part of providing favorable renewable energy project economics but only that reductions in perceived risk will not necessarily lower the absolute cost of financing from current levels―rather, it will likely keep rates as low as the market will bear. Reducing risk also allows for increased deployment by opening markets or projects that would have otherwise been too risky.

References

The following references are specific to this page; for all references in this ATB, see References.

BloombergNEF. “2H 2023 LCOE Update: An Uneven Recovery,” December 12, 2023. https://www.bnef.com/insights/32967.

Norton Rose Fulbright. “Cost of Capital: 2024 Outlook | Norton Rose Fulbright,” February 19, 2024. https://www.projectfinance.law/publications/2024/february/cost-of-capital-2024-outlook/.

Feldman, David, Mark Bolinger, and Paul Schwabe. “Current and Future Costs of Renewable Energy Project Finance Across Technologies.” Golden, CO: National Renewable Energy Laboratory, July 1, 2020. https://doi.org/10.2172/1660124.

Theis, Joel. “Quality Guidelines for Energy Systems Studies: Cost Estimation Methodology for NETL Assessments of Power Plant Performance.” National Energy Technology Laboratory, February 2021. https://doi.org/10.2172/1567736.

Ormat Technologies. “Form 10K For the Fiscal Year Ended December 31, 2023,” February 24, 2024. https://d18rn0p25nwr6d.cloudfront.net/CIK-0001296445/ba6d08dc-8d1b-41db-92cb-3942b5003f6c.pdf.

Ormat Technologies. “Ormat Technologies Annual Report 2023,” February 24, 2023. https://stocklight.com/stocks/us/nyse-ora/ormat-technologies/annual-reports/nyse-ora-2023-10K-23662767.pdf.

Brookfield Renewable Partners, LP. “2023 Q3 Interim Report,” November 3, 2023. https://bep.brookfield.com/sites/bep-brookfield-ir/files/Brookfield-BEP-IR-V2/2023/Q3/bep-q3-2023-interim-report.pdf.

LP, NextEra Energy Partners. “NextEra Energy Partners, LP Announces the Pricing of $750 Million of 7.25% Senior Unsecured Notes Due 2029,” December 4, 2023. https://www.prnewswire.com/news-releases/nextera-energy-partners-lp-announces-the-pricing-of-750-million-of-7-25-senior-unsecured-notes-due-2029--302005105.html.

U.S. Department of the Treasury. “Resource Center.” U.S. Department of the Treasury, February 28, 2024. https://home.treasury.gov/resource-center/data-chart-center/interest-rates/TextView?type=daily_treasury_bill_rates&field_tdr_date_value=2024.

Congressional Budget Office. “The Budget and Economic: 2024 to 2034,” February 14, 2024. https://www.congress.gov/118/meeting/house/116833/witnesses/HHRG-118-BU00-Wstate-SwagelP-20240214.pdf.

Gagnon, Pieter, An Pham, Wesley Cole, Sarah Awara, Anne Barlas, Maxwell Brown, Patrick Brown, et al. “2023 Standard Scenarios Report: A U.S. Electricity Sector Outlook,” 2024. https://doi.org/10.2172/2274777.

The White House. “Inflation Reduction Act Guidebook - Clean Energy.” The White House, 2022. https://www.whitehouse.gov/cleanenergy/inflation-reduction-act-guidebook/.

Norton Rose Fulbright. “Cost of Capital: 2023 Outlook | Norton Rose Fulbright.” Norton Rose Fulbright, 2023. https://www.nortonrosefulbright.com/en-us/knowledge/webinars/2c5504d5/cost-of-capital-2023-outlook.

Martin, Keith. “Solar Finance Outlook | Norton Rose Fulbright,” December 12, 2019. https://www.projectfinance.law/publications/2019/december/solar-finance-outlook/.

BNEF. “Renewable Energy Projects Database,” n.d.

World Bank. “International Bank for Reconstruction and Development Project Appraisal Document on a Proposed Loan in the Amount of EUR234.50 Million and US$80 Million (US$400 Million Equivalent) and a Proposed Loan from the Clean Technology Fund in the Amount of US$119 Million to the Moroccan Agency for Solar Energy with Guarantee from the Kingdom of Morocco  for the Noor-Ouarzazate Concentrated Solar Power Plant Project.” The World Bank, September 4, 2014. http://documents.worldbank.org/curated/en/748641468279941398/pdf/PAD10070PAD0P100disclosed0120220140.pdf.

New Energy Update. “World’s Largest CSP Project Achieves Financial Closure: US Announces $33mn CSP Funding,” April 3, 2019. https://analysis.newenergyupdate.com/csp-today/worlds-largest-csp-project-achieves-financial-closure-us-announces-33mn-csp-funding.

Thompson Reuters. “League Tables 2017.” Thompson Reuters, January 24, 2018.

Thompson Reuters. “League Tables 2018.” Thompson Reuters Project Finance International, January 30, 2019.

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