Exhibit 99.1

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Clean Energy Reports Revenue of $117.6 Million and 67.4 Million RNG Gallons Sold for the First Quarter of 2026.

NEWPORT BEACH, Calif. — (BUSINESS WIRE) — May 7, 2026 — Clean Energy Fuels Corp. (NASDAQ: CLNE) (“Clean Energy” or the “Company”) today announced its operating results for the first quarter of 2026.

Financial Highlights

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Operational and Strategic Highlights

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Commentary by Clay Corbus, President and Chief Executive Officer

“It was great to see our RNG volumes continue at a steady pace and rebound from last year.  There is always extreme winter weather that can impact RNG production at dairies, and this year was no different - particularly in the upper Midwest - but we see a lot of progress being made with refinements to operating procedures to continually improve dairy RNG production.  We’ve seen it with our dairies and see great efforts across the industry to keep the RNG volumes up and flowing.  We are doing our part, with our most recent projects such as the East Valley project, in Idaho, and the South Fork project, in Texas, ramping up production.  Additionally, at the end of the quarter the conflict in Iran and the resulting higher oil prices has driven up the price of diesel. Fleets are taking note of our much less volatile transportation fuel.  Our results reflect some of these tailwinds of elevated oil and diesel prices, particularly in our revenues, compared to a relatively stable natural gas commodity market.  We were very pleased with our first quarter results and feel good about our position in the geopolitical environment as it relates to offering a domestically supplied, low-cost sustainable transportation fuel that is available today.”

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Summary and Review of Results

The Company’s revenue for the first quarter of 2026 was decreased by $10.1 million of non-cash stock-based sales incentive contra-revenue charges (“Amazon warrant charges”) related to the warrant issued to Amazon.com NV Investment Holdings LLC (the “Amazon warrant”), compared to Amazon warrant charges of $17.3 million in Q1 2025. Q1 2026 station construction revenues were $8.2 million versus $5.6 million of station construction revenues in Q1 2025. Revenue for Q1 2026 also included an unrealized gain of $0.6 million on commodity swap and customer fueling contracts relating to the Company’s Zero Now truck financing program, compared to an unrealized loss of $0.6 million in Q1 2025. Q1 2026 renewable identification number (“RIN”) and low carbon fuel standards (“LCFS”) revenues of $14.4 million versus $9.0 million of RIN and LCFS revenues in Q1 2025 reflecting an increase of $5.4 million. This $5.4 million increase was due (i) an increase in RIN revenue of $4.9 million primarily due to a higher share of RIN values, higher volume,

and incremental RIN revenue generated by the Company’s consolidated dairy RNG project (upstream) and (ii) an increase in LCFS revenue of $0.5 million primarily due to incremental LCFS revenue generated by the Company’s consolidated RNG project (upstream business).

Net loss attributable to Clean Energy for Q1 2025 included an impairment of goodwill of $(64.3) million and accelerated depreciation expense from the abandonment of certain LNG station assets located at 55 Pilot Flying J locations of $(50.7) million versus no such charges in Q1 2026. Q1 2026 losses from equity method investments were lower than Q1 2025 due to the ramp up of operations of our dairy RNG projects. Selling, general and administrative expenses were lower in Q1 2026 compared to Q1 2025 by approximately $2.9 million mainly due to a decrease in general business expenses.

Non-GAAP income (loss) per share (as defined below) for Q1 2025 was $0.01, compared to $(0.01) per share for Q1 2026.

In this press release, Clean Energy refers to various GAAP (U.S. generally accepted accounting principles) and non-GAAP financial measures. The non-GAAP financial measures may not be comparable to similarly titled measures being used and disclosed by other companies. Clean Energy believes that this non-GAAP information is useful for an understanding of its operating results and the ongoing performance of its business. Non-GAAP income (loss) per share and Adjusted EBITDA are defined below and reconciled to GAAP net income (loss) per share attributable to Clean Energy and GAAP net income (loss) attributable to Clean Energy, respectively.

The table below shows GAAP and non-GAAP income (loss) attributable to Clean Energy per share and reconciles GAAP net income (loss) attributable to Clean Energy to the non-GAAP net income (loss) attributable to Clean Energy figure used in the calculation of non-GAAP income (loss) per share:

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The table below shows Adjusted EBITDA and also reconciles this figure to GAAP net loss attributable to Clean Energy:

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The tables below present a further breakdown of the above consolidated Adjusted EBITDA:

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* Fuel distribution represents the Company’s consolidated results excluding the results from RNG equity method investments attributable to clean energy and the results of the Company’s consolidated RNG project.

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* RNG upstream combines net loss from RNG equity method investments attributable to Clean Energy and the results of the Company’s consolidated RNG project.

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Fuel Volume

The following table presents, for the three months ended March 31, 2025 and 2026; the amount of total fuel volume the Company sold to customers with particular focus on RNG volume as a subset of total fuel volume.

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The following table shows the Company’s sources of revenue for the three months ended March 31, 2025 and 2026:

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2026 Outlook

Our GAAP net loss for 2026 is expected to range from approximately $(71) million to $(66) million, assuming no unrealized gains or losses on customer contracts relating to the Company’s truck financing program and Amazon warrant charges estimated to be approximately $47 million. Changes in diesel and natural gas market conditions resulting in unrealized gains or losses on the Company’s customer fueling contracts relating to the Company’s truck financing program, and significant variations in the vesting of the Amazon warrant could significantly affect the Company’s estimated GAAP net loss for 2026. Adjusted EBITDA for 2026 is estimated to range from approximately $70 million to $75 million. These expectations exclude the impact of any acquisitions, divestitures, new joint ventures, transactions and other extraordinary events; and macroeconomic conditions and global supply chain issues. Additionally, the expectations regarding 2026 Adjusted EBITDA assume the calculation of this non-GAAP financial measure in the same manner as described above and adding back the estimated Amazon warrant charges described above and without adjustments for any other items that may arise during 2026 that management deems appropriate to exclude. These expectations are forward-looking statements and are qualified by the statement under “Safe Harbor Statement” below.

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The tables below present a further breakdown of the above consolidated Adjusted EBITDA:

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* Fuel distribution represents the Company’s consolidated results excluding the results from RNG equity method investments attributable to clean energy and the results of the Company’s consolidated RNG project.

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* RNG upstream combines net loss from RNG equity method investments attributable to Clean Energy and the results of the Company’s consolidated RNG project.

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Today’s Conference Call

The Company will host an investor conference call today at 4:30 p.m. Eastern time (1:30 p.m. Pacific). Investors interested in participating in the live call can dial 1.800.343.4849 from the U.S. (Conference ID: CLEAN) and international callers can dial 1.203.518.9848 (Conference ID: CLEAN). A telephone replay will be available approximately three hours after the call concludes through Sunday June 7, 2026, by dialing 1.844.512.2921 from the U.S., or 1.412.317.6671 from international locations, and entering Replay Pin Number 11161549. There also will be a simultaneous, live webcast available on the Investor Relations section of the Company’s web site at www.cleanenergyfuels.com, which will be available for replay for 30 days.

About Clean Energy Fuels Corp.

Clean Energy Fuels Corp. is the country’s largest provider of the cleanest fuel for the transportation market. Our mission is to decarbonize transportation through the development and delivery of renewable natural gas (“RNG”), a sustainable fuel derived from organic waste. Clean Energy allows thousands of vehicles, from airport shuttles to city buses to waste and heavy-duty trucks, to reduce their amount of climate-harming greenhouse gas. We operate a vast network of fueling stations across the U.S. and Canada. Visit www.cleanenergyfuels.com and follow @ce_renewables on X (formerly known as Twitter).

Non-GAAP Financial Measures

To supplement the Company’s unaudited condensed consolidated financial statements presented in accordance with GAAP, the Company uses non-GAAP financial measures that it calls non-GAAP income (loss) per share (“non-GAAP income (loss) per share”) and adjusted EBITDA (“Adjusted EBITDA”). Management presents non-GAAP income (loss) per share and Adjusted EBITDA because it believes these measures provide meaningful supplemental information about the Company’s performance for the following reasons: (1) they allow for greater transparency with respect to key metrics used by management to assess the Company’s operating performance and make financial and operational decisions; (2) they exclude the effect of items that management believes are not directly attributable to the Company’s core operating performance and may obscure trends in the business; and (3) they are used by institutional investors and the analyst community to help analyze the Company’s business. In future quarters, the Company may adjust for other expenditures, charges or gains to present non-GAAP financial measures that the Company’s management believes are indicative of the Company’s core operating performance.

Non-GAAP financial measures are limited as an analytical tool and should not be considered in isolation from, or as a substitute for, the Company’s GAAP results. The Company expects to continue reporting non-GAAP financial measures, adjusting for the items described below (and/or other items that may arise in the future as the Company’s management deems appropriate), and the Company expects to continue to incur expenses, charges or gains like the non-GAAP adjustments described below. Accordingly, unless expressly stated otherwise, the exclusion of these and other similar items in the presentation of non-GAAP financial measures should not be construed as an inference that these costs are unusual, infrequent, or non-recurring. Non-GAAP income (loss) per share and Adjusted EBITDA are not recognized terms under GAAP and do not purport to be an alternative to GAAP income (loss), GAAP income (loss) per share or any other GAAP measure as an indicator of operating performance. Moreover, because not all companies use identical measures and calculations, the Company’s presentation of non-GAAP income (loss) per share and Adjusted EBITDA may not be comparable to other similarly titled measures used by other companies.

Non-GAAP Income (Loss) Per Share

Non-GAAP income (loss) per share, which the Company presents as a non-GAAP measure of its performance, is defined as net income (loss) attributable to Clean Energy Fuels Corp plus Amazon warrant charges, plus stock-based compensation expense, plus the accelerated depreciation expense from the abandonment of certain LNG station assets located at 55 Pilot Flying J locations, plus (minus) loss (income) from Rimere equity method investment, plus (minus) loss (income) from the SAFE S.p.A. equity method investment, plus

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(minus) any loss (gain) from changes in the fair value of derivative instruments, plus one-off, non-cash charge to Goodwill, (minus) gain on extinguishment of loan receivable and equity security and minus amortization of investment tax credit from RNG equity method investments, the total of which is divided by the Company’s weighted-average common shares outstanding on a diluted basis. The Company’s management believes excluding non-cash expenses related to the Amazon warrant charges provides useful information to investors regarding the Company’s performance because the Amazon warrant charges are measured based upon a fair value determined using a variety of assumptions and estimates, and the Amazon warrant charges do not affect the Company’s operating cash flows related to the delivery and sale of vehicle fuel to its customer. The Company’s management believes excluding non-cash expenses related to stock-based compensation provides useful information to investors regarding the Company’s performance because of the varying available valuation methodologies, the volatility of the expense (which depends on market forces outside of management’s control), the subjectivity of the assumptions and the variety of award types that a company can use, which may obscure trends in a company’s core operating performance. In addition, the Company’s management believes excluding the results from the Rimere equity method investment is useful to investors because Rimere is an investment belonging to the non-core operations of the Company, and its results are not indicative of the Company’s ongoing operations. Similarly, the Company’s management believes excluding the non-cash results from the SAFE S.p.A. equity method investment is useful to investors because these charges are not part of or representative of the core operations of the Company. In addition, the Company’s management believes excluding the non-cash loss (gain) from changes in the fair value of derivative instruments is useful to investors because the valuation of the derivative instruments is based on a number of subjective assumptions, the amount of the loss or gain is derived from market forces outside of management’s control, and the exclusion of these amounts enables investors to compare the Company’s performance with other companies that do not use, or use different forms of, derivative instruments. Furthermore, the Company’s management believes excluding other income relating to the amortization of investment tax credit from RNG equity method investments is useful to investors because such income is not generated from the core operations of the Company and may obscure trends of the Company’s core operations.

Adjusted EBITDA

Adjusted EBITDA, which the Company presents as a non-GAAP measure of its performance, is defined as net income (loss) attributable to Clean Energy Fuels Corp plus (minus) income tax expense (benefit), plus interest expense (including any losses from the extinguishment of debt), minus interest income, plus depreciation and amortization expense, plus the accelerated depreciation expense from the abandonment of certain LNG station assets located at 55 Pilot Flying J locations, plus one-off, non-cash charge to Goodwill, minus gain on extinguishment of loan receivable and equity security plus Amazon warrant charges, plus stock-based compensation expense, plus (minus) loss (income) from the Rimere equity method investment, plus (minus) loss (income) from the SAFE S.p.A. equity method investment, plus (minus) any loss (gain) from changes in the fair value of derivative instruments, plus depreciation and amortization expense from RNG equity method investments, plus interest expense from RNG equity method investments, minus interest income from RNG equity method investments, and minus amortization of investment tax credit from RNG equity method investments and the Company’s consolidated RNG project. The Company’s management believes Adjusted EBITDA provides useful information to investors regarding the Company’s performance for the same reasons discussed above with respect to non-GAAP income (loss) per share. In addition, management internally uses Adjusted EBITDA to determine elements of executive and employee compensation.

Safe Harbor Statement

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including statements about, among other things, our fiscal 2026 outlook, our volume growth, customer expansion, production sources, joint ventures, governmental regulations, vehicle adoption, and the benefits of our fuels.

Forward-looking statements are statements other than historical facts and relate to future events or circumstances or the Company’s future performance, and are based on the Company’s current assumptions, expectations and beliefs concerning future developments and their potential effect on the Company and its business. As a result, actual results, performance or achievements and the timing of events could differ materially from those anticipated in or implied by these forward-looking statements as a result of many factors including, among others: the willingness of fleets and other consumers to adopt natural gas as a vehicle fuel, and the rate and level of any such adoption; the market’s perception of the benefits of RNG and conventional natural gas relative to other alternative vehicle fuels; natural gas vehicle and engine cost, fuel usage, availability, quality, safety, convenience, design, performance and residual value, as well as operator perception with respect to these factors, in general and in the Company’s key customer markets, including heavy-duty trucking; the Company’s ability to further develop and manage its RNG business, including its ability to procure adequate supplies of RNG and generate revenues from sales of such RNG; the Company and its suppliers’ ability to successfully develop and operate projects and produce expected volumes of RNG; the impact of a bankruptcy or failure of any source owners at our projects; the Company’s dependence on the production of vehicles and engines by manufacturers over which the Company has no control; the long and variable

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development cycle required to secure ADG RNG from new projects; the potential commercial viability, solvency, financial capacity, and operational capability of livestock waste and dairy farm projects to produce RNG; the Company’s history of net losses and the possibility that the Company could incur additional net losses in the future; the Company’s and its partners’ ability to acquire, finance, construct and develop other commercial projects; the Company’s ability to invest in hydrogen stations or modify its fueling stations to reform its RNG to fuel hydrogen and charge electric vehicles; the future supply, demand, use and prices of crude oil, gasoline, diesel, natural gas, and other vehicle fuels, including overall levels of and volatility in these factors; changes in the competitive environment in which we operate, including potentially increasing competition in the market for vehicle fuels generally; the Company’s ability to manage and increase its business of transporting and selling CNG for non-vehicle purposes via virtual natural gas pipelines and interconnects, as well as its station design and construction activities; construction, permitting and other factors that could cause delays or other problems at station construction projects; the Company’s ability to procure and maintain contracts with government entities; the Company’s ability to execute and realize the intended benefits of any acquisitions, divestitures, investments or other strategic relationships or transactions; significant fluctuations in the Company’s results of operations, which make it difficult to predict future results of operations; the Company’s warranty reserves may not adequately cover its warranty obligations; a future pandemic, epidemic or other infectious disease outbreak; the future availability of and the Company’s access to additional capital, which may include debt or equity financing, in the amounts and at the times needed to fund growth in the Company’s business and the repayment of its debt obligations (whether at or before their due dates) or other expenditures, as well as the terms and other effects of any such capital raising transaction; the Company’s ability to generate sufficient cash flows to repay its debt obligations as they come due; the availability of environmental, tax and other government legislation, regulations, programs and incentives that promote natural gas, such as AFTC, or other alternatives as a vehicle fuel, including long-standing support for gasoline- and diesel-powered vehicles and growing support for electric and hydrogen-powered vehicles that could result in programs or incentives that favor these or other vehicles or vehicle fuels over natural gas; the Company’s ability to comply with various registration and regulatory requirements related to its RNG projects; the effect of, or potential for changes to greenhouse gas emissions requirements or other environmental regulations applicable to vehicles powered by gasoline, diesel, natural gas or other vehicle fuels and crude oil and natural gas fueling, drilling, production, transportation or use; the Company’s ability to manage the health, safety and environmental risks inherent in its operations; the Company’s compliance with all applicable government and environmental regulations; the impact of the foregoing on the trading price of the Company’s common stock; the interests of the Company’s significant stockholders may differ from the Company’s other stockholders; the Company’s ability to protect against any material failure, inadequacy, interruption or security failure of its information technology; the Company’s recent leadership transition; and general political, regulatory, economic and market conditions.

The forward-looking statements made in this press release speak only as of the date of this press release and the Company undertakes no obligation to update publicly such forward-looking statements to reflect subsequent events or circumstances, except as otherwise required by law. The Company’s periodic reports filed with the Securities and Exchange Commission (www.sec.gov), including its Annual Report on Form 10-K for the year ended December 31, 2025 that the Company filed with the Securities and Exchange Commission on February 24, 2026, and its Quarterly Report on Form 10-Q for the quarter ended March 31, 2026 that the Company expects to file with the Securities and Exchange Commission on or about May 7, 2026, contain additional information about these and other risk factors that may cause actual results to differ materially from the forward-looking statements contained in this press release, and such risk factors may be amended, supplemented or superseded from time to time by other reports the Company files with the Securities and Exchange Commission.

Media Contact:
Gary Foster
(949) 437-1113
Gary.Foster@cleanenergyfuels.com

Investor Contact:

Thomas Driscoll

(949) 437-1191

Thomas.Driscoll@cleanenergyfuels.com

Source: Clean Energy Fuels Corp.

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Clean Energy Fuels Corp. and Subsidiaries

Condensed Consolidated Balance Sheets

(In thousands, except share and per share data; Unaudited)

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Clean Energy Fuels Corp. and Subsidiaries

Condensed Consolidated Statements of Operations

(In thousands, except share and per share data; Unaudited)

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