The discussion in this section contains forward-looking statements. These statements relate to future events or our future financial performance. We have attempted to identify forward-looking statements by terminology such as "anticipate," "believe," "can," "continue," "could," "estimate," "expect," "intend," "may," "plan," "potential," "predict," "should," "would" or "will" or the negative of these terms or other comparable terminology, but their absence does not mean that a statement is not forward-looking. These statements are only predictions and involve known and unknown risks, uncertainties and other factors, which could cause our actual results to differ from those projected in any forward-looking statements we make. See "Risk Factors" in Part II, Item 1A of this report for a discussion of some of these risks and uncertainties. This discussion should be read with our financial statements and related notes included elsewhere in this report.

We provide natural gas solutions for vehicle fleets primarily in the United States and Canada. In April 2008, we opened our first CNG station in Lima, Peru, through our joint venture, Clean Energy del Peru. Our primary business activity is selling CNG and LNG vehicle fuels to our customers. We also build, operate and maintain fueling stations, and help our customers acquire and finance natural gas vehicles and obtain local, state and federal clean air incentives. Our customers include fleet operators in a variety of markets, such as public transit, refuse hauling, airports, taxis and regional trucking. In August 2008, we acquired 70% of the outstanding membership interest of Dallas Clean Energy, LLC ("DCE"). DCE owns a facility that collects, processes and sells landfill gas at the McCommas Bluff landfill located in Dallas, Texas.

Overview

This overview discusses matters on which our management primarily focuses in evaluating our financial condition and operating performance.

Sources of revenue. We generate the vast majority of our revenue from selling CNG and LNG to our customers. The balance of our revenue is provided by operating and maintaining natural gas fueling stations, designing and constructing natural gas fueling stations, financing our customers' natural gas vehicle purchases and selling landfill gas through our interest in DCE.

Key operating data. In evaluating our operating performance, our management focuses primarily on (1) the amount of CNG and LNG gasoline gallon equivalents delivered (which we define as (i) the volume of gasoline gallon equivalents we sell to our customers, plus (ii) the volume of gasoline gallon equivalents dispensed to our customers at stations where we provide O&M services but do not directly sell the CNG or LNG, plus (iii) our proportionate share of the gasoline gallon equivalents sold through our joint venture in Peru and our interest in the McCommas Bluff Landfill in Dallas, Texas), and (2) our revenue and net income (loss). The following table, which you should read in conjunction with our condensed consolidated financial statements and notes contained elsewhere in this report, presents our key operating data for the years ended December 31, 2005, 2006 and 2007 and for the three and nine months ended September 30, 2007 and 2008:

                                                                           Three Months     Nine Months    Three Months     Nine Months
                               Year Ended     Year Ended     Year Ended        Ended           Ended           Ended           Ended
Gasoline gallon equivalents   December 31,   December 31,   December 31,   September 30,   September 30,   September 30,   September 30,
delivered (in millions)           2005           2006           2007           2007            2007            2008            2008
CNG                                   36.1           41.9           48.0            12.9            36.3            12.9            36.3
LNG                                   20.7           26.5           27.3             7.1            20.8             5.8            18.5

Total                                 56.8           68.4           75.3            20.0            57.1            18.7            54.8




Operating data
Revenue             $ 77,955,083   $ 91,547,316   $ 117,716,233   $ 29,210,164   $ 88,040,804   $ 35,273,687   $ 99,823,025
Net income (loss)     17,257,587    (77,500,741 )    (8,894,362 )   (1,544,970 )   (5,978,051 )  (10,637,146 )  (18,478,575 )

Key trends in 2005, 2006, and 2007. Vehicle fleet demand for natural gas fuels increased during the three years ended December 31, 2005, 2006 and 2007. We believe this growth in demand was attributable primarily to the rising prices of gasoline and diesel relative to CNG and LNG during these periods and increasingly stringent environmental regulations affecting vehicle fleets. We capitalized on this growing demand by securing new fleet customers in a variety of markets, including public transit, refuse hauling, airports, taxis and regional trucking.

The number of fueling stations we served grew from 147 at December 31, 2004 to 175 at September 30, 2008 (a 19.0% increase). The amount of CNG and LNG gasoline gallon equivalents we delivered from 2005 to 2007 increased by 32.6%. Our cost of sales also increased during these periods, which was attributable primarily to the increased price of natural gas and increased costs related to delivering CNG and LNG to our customers.

Recent developments. On September 5, 2008, we entered into a Share Purchase Agreement with American Honda Motor Co., Inc. ("Honda"), John G. Armstrong (as sole trustee of The FuelMaker Trust) and FuelMaker Corporation, pursuant to which we agreed to purchase FuelMaker Corporation for $17 million in cash. Under the terms of the purchase agreement, either we or Honda had the right to terminate the purchase agreement, without any obligation or liability thereunder, if the closing did not occur on or before October 3, 2008. On October 13, 2008, Honda delivered to us a notice that it intended to terminate the purchase agreement; and, after subsequent discussions, on October 15, 2008, we and Honda mutually agreed to terminate the purchase agreement in accordance with its terms. On November 3, 2008, we completed a sale of 4,419,192 units of common stock and warrants for $7.92 per unit (See note 20 to the accompanying condensed consolidated financial statements for a discussion of the transaction) and raised net proceeds of approximately $32.5 million after deducting offering costs.

In October and November of 2008, we spent approximately $15 million supporting Proposition 10, the California Alternative Fuel Vehicles and Renewable Energy Initiative. California voters failed to pass Proposition 10 in the November 4, 2008 election. The $15 million we spent supporting Proposition 10 in October and November 2008 will be reflected in selling, general and administrative expense in our financial statements for the fourth quarter of 2008.

Anticipated future trends. We anticipate that, over the long term, the prices for gasoline and diesel will continue to be higher than the price of natural gas as a vehicle fuel, and more stringent emissions requirements will continue to make natural gas vehicles an attractive alternative to traditional gasoline and diesel powered vehicles. We believe there will be significant growth in the consumption of natural gas as a vehicle fuel among vehicle fleets, and our goal is to capitalize on this trend and enhance our leadership position as this market expands. We have built a natural gas fueling station, and plan to build additional natural gas fueling stations, that will provide LNG to fleet vehicles at the Ports of Los Angeles and Long Beach. We also anticipate expanding our sales of CNG and LNG in the other markets in which we operate, including public transit, refuse hauling and airports. Consistent with the anticipated growth of our business, we also expect that our operating costs and capital expenditures will increase, primarily from the logistics of delivering more CNG and LNG to our customers, as well as from the anticipated expansion of our station network. We also continue to incur significant costs related to the LNG liquefaction plant we are in the process of building in California. Additionally, we have and will continue to increase our sales and marketing team and other necessary personnel as we seek to expand our existing markets and enter new markets, which will also result in increased costs.

Sources of liquidity and anticipated capital expenditures. In May 2007, we completed our initial public offering of 10,000,000 shares of common stock at a public offering price of $12.00 per share. Net cash proceeds from the initial public offering were approximately $108.5 million, after deducting underwriting discounts, commissions and offering expenses. Historically, our principal sources of liquidity have been cash provided by operations, capital contributions from our stockholders, our cash and cash equivalents and, during the third and fourth quarters of fiscal 2006, a revolving line of credit with Boone Pickens, a director and our largest stockholder. The line of credit was used to fund margin requirements on certain derivative contracts and was terminated in December 2006. On September 24, 2008, we sold 319,488 shares of our common stock at a purchase price of $15.65 per share to Boone Pickens Interests, Ltd. for proceeds of approximately $5.0 million. On November 3, 2008 we sold 4,419,192 shares of common stock and warrants exercisable for common stock and received net proceeds of approximately $32.5 million. (See note 20 to the accompanying condensed consolidated financial statements for a discussion of the transaction). After this transaction, we had approximately $38.5 million in total cash and cash equivalents.

Our business plan for the last three months of 2008 calls for approximately $23.0 million in capital expenditures (primarily related to building our LNG liquefaction plant in California and constructing new fueling stations) and $0.8 million for financing natural gas vehicle purchases by our customers. We may also seek to acquire companies or assets in the natural gas fueling infrastructure, services and production industries. If we do so, we may need to raise additional capital as necessary to fund any such acquisitions, which are not budgeted for in our 2008 business plan. We anticipate that we will need to raise additional capital in 2009 to fund our 2009 capital expenditures program; however, the timing and necessity of any future capital raise will depend primarily on our rate of new station construction and other capital expenditures.

Volatility in operating results related to futures contracts. Historically, we have purchased futures contracts from time to time to help mitigate our exposure to natural gas price fluctuations in current periods and in future periods. Gains and losses related to our futures activities, which appear in the line item derivative (gains) losses in our condensed consolidated financial statements, have materially impacted our results of operations in recent periods. For the years ended December 31, 2005, 2006 and 2007, derivative
(gains) losses were $(44,067,744), $78,994,947, and $0, respectively. For the nine months ended September 30, 2007 and 2008, derivative (gains) losses were $0 and $340,746, respectively. For this reason and others, we caution investors that our past operating results may not be indicative of future results. For more information, please read "Volatility of Earnings and Cash Flows" and "Risk Management Activities" below.

Business risks and uncertainties. Our business and prospects are exposed to numerous risks and uncertainties. For more information, see "Risk Factors" in Part II, Item 1A of this report.

Operations

We generate revenues principally by selling CNG and LNG to our vehicle fleet customers. For the nine months ended September 30, 2008, CNG represented 66% and LNG represented 34% of our natural gas sales (on a gasoline gallon equivalent basis). To a lesser extent, we generate revenues by operating and maintaining natural gas fueling stations that are owned either by us or our customers and selling landfill gas provided by our interest in DCE (commencing in August 2008). Substantially all of our operating and maintenance revenues are generated from CNG stations, as owners of LNG stations tend to operate and maintain their own stations. In addition, we generate a small portion of our revenues by designing and constructing fueling stations and selling or leasing those stations to our customers. Substantially all of our station sale and leasing revenues have been generated from CNG stations. In 2006, we began providing vehicle finance services to our customers.

CNG Sales

We sell CNG through fueling stations located on our customers' properties and through our network of public access fueling stations. At these CNG fueling stations, we procure natural gas from local utilities or brokers under standard, floating-rate arrangements and then compress and dispense it into our customers' vehicles. Our CNG sales are made primarily through contracts with our fleet customers. Under these contracts, pricing is determined primarily on an index-plus basis, which is calculated by adding a margin to the local index or utility price for natural gas. We sell a small amount of CNG under fixed-price contracts and also provide price caps to certain customers on their index-plus pricing arrangement. Effective January 1, 2007, we no longer intend to offer price-cap contracts to our customers, but we will continue to perform our obligations under price-cap contracts we entered into before January 1, 2007. We will continue to offer fixed price contracts as appropriate and consistent with our revised natural gas hedging policy revised in May 2008. Our fleet customers typically are billed monthly based on the volume of CNG sold at a station. The remainder of our CNG sales are on a per fill-up basis at prices we set at the pump based on prevailing market conditions. These customers typically pay using a credit card at the station. In April 2008, we opened our first CNG station in Lima, Peru through our joint venture Clean Energy del Peru.

LNG Sales

We sell substantially all of our LNG to fleet customers, who typically own and operate their fueling stations. We also sell a small volume of LNG to customers for non-vehicle use. We procure LNG from third-party producers and also produce LNG at our liquefaction plant in Texas. For LNG that we purchase from third-parties, we typically enter into "take or pay" contracts that require us to purchase minimum volumes of LNG at index-based rates. We deliver LNG via our fleet of 60 tanker trailers to fueling stations, where it is stored and dispensed in liquid form into vehicles. We sell LNG principally through supply contracts that are priced on either a fixed-price or index-plus basis. We also provided price caps to certain customers on the index component of their index-plus pricing arrangement for certain contracts we entered into on or prior to December 31, 2006. Effective January 1, 2007, we no longer intend to offer price-cap contracts to our customers, but we will continue to perform our obligations under price-cap contracts we

entered into before January 1, 2007, including two one-year renewal periods beginning April 1, 2009 that one of our customers is entitled to should they choose to exercise such renewals. The renewal periods, if exercised, would obligate us to sell the customer approximately 2.1 million LNG gallons on an annual basis subject to a price cap of $7.50 per MMbtu on the SoCal Border index for each renewal year. We will continue to offer fixed price contracts as appropriate and consistent with our revised natural gas hedging policy adopted in May 2008. Our LNG contracts provide that we charge our customers periodically based on the volume of LNG supplied.

Government Incentives

From October 1, 2006 through December 31, 2009, we may receive a Volumetric Excise Tax Credit (VETC) of $0.50 per gasoline gallon equivalent of CNG and $0.50 per liquid gallon of LNG that we sell as vehicle fuel. Based on the service relationship we have with our customers, either we or our customers are able to claim the credit. We expect the tax credit will continue to factor into the price we charge our customers for CNG and LNG in the future. The legislation that created this tax credit also increased the federal excise taxes on sales of CNG from $0.061 to $0.183 per gasoline gallon equivalent and on sales of LNG from $0.119 to $0.243 per LNG gallon. These new excise tax rates are approximately the same as those for gasoline and diesel fuel.

Operation and Maintenance

We generate a smaller portion of our revenue from operation and maintenance agreements for CNG fueling stations where we do not supply the fuel. We refer to this portion of our business as "O&M." At these fueling stations, the customer contracts directly with a local broker or utility to purchase natural gas. For O&M services, we do not sell the fuel itself, but generally charge a per-gallon fee based on the volume of fuel dispensed at the station.

Station Construction

We generate a small portion of our revenue from designing and constructing fueling stations and selling or leasing the stations to our customers. For these projects, we act as general contractor or supervise qualified third-party contractors. We charge construction fees or lease rates based on the size and complexity of the project.

Vehicle Acquisition and Finance

In 2006, we commenced offering vehicle finance services for some of our customers' purchases of natural gas vehicles or the conversion of their existing gasoline or diesel powered vehicles to operate on natural gas. We loan to our customers up to 100% of the purchase price of their natural gas vehicles. We may also lease vehicles in the future. Where appropriate, we apply for and receive state and federal incentives associated with natural gas vehicle purchases and pass these benefits through to our customers. We may also secure vehicles to place with customers or pay deposits with respect to such vehicles prior to receiving a firm order from our customers, which we may be required to purchase if our customer fails to purchase the vehicle as anticipated. As of September 30, 2008, we have not generated significant revenue from vehicle finance activities.

Landfill Gas

In August 2008, we acquired 70% of the outstanding membership interests of DCE. DCE owns a facility that collects, processes and sells landfill gas at the McCommas Bluff landfill located in Dallas, Texas. A small portion of our revenues are derived from our interest in DCE.

Volatility of Earnings and Cash Flows

Our earnings and cash flows historically have fluctuated significantly from period to period based on our futures activities, as all but a few of our futures contracts have not historically qualified for hedge accounting under SFAS 133. See "Critical Accounting Policies" below. We have therefore recorded any changes in the fair market value of these contracts directly in our statements of operations in the line item derivative (gains) losses along with any realized gains or losses generated during the period. For example, we experienced derivative gains of $33.1 million and $5.7 million for the three months ended September 30, 2005 and June 30, 2008, and derivative losses of $19.9 million, $0.3 million, $65.0 million, $13.7 million and $6.0 million for the three months ended December 31, 2005, March 31, 2006, September 30, 2006, December 31, 2006 and September 30, 2008,

respectively. We had no derivative gains or losses for the three months ended June 30, 2006, March 31, 2007, June 30, 2007, September 30, 2007, December 31, 2007 and March 31, 2008.

For the three months ended June 30, 2008, we recognized a $5.7 million derivative gain with respect to futures contracts purchased to hedge our exposure to a fixed price contract for which we bid, and we recognized a $6.0 million derivative loss during the three months ending September 30, 2008 with respect to the sale of certain of these contracts (see note 6 to the accompanying condensed consolidated financial statements). Commencing with the adoption of our revised natural gas hedging policy in February 2007 (as revised in May 2008), we plan to structure all subsequent futures contracts as cash flow hedges under SFAS 133, but we cannot be certain that they will qualify. See "Risk Management Activities" below. If the futures contracts do not qualify for hedge accounting, we could incur significant increases or decreases in our earnings based on fluctuations in the market value of these contracts from period to period.

Additionally, we are required to maintain a margin account to cover losses related to our natural gas futures contacts. Futures contracts are valued daily, and if our contracts are in loss positions at the end of a trading day, our broker will transfer the amount of the losses from our margin account to a clearinghouse. If at any time the funds in our margin account drop below a specified maintenance level, our broker will issue a margin call that requires us to restore the balance. Consequently, these payments could significantly impact our cash balances. At September 30, 2008, we had $0.8 million on deposit in margin accounts.

The decrease in the value of our futures positions and any required margin deposits on our futures contracts that are in a loss position could significantly impact our financial condition in the future.

Risk Management Activities

Our risk management activities, including the revised natural gas hedging policy adopted by our board of directors in February 2007 and revised by our board of directors on May 29, 2008 are discussed in Part II, Item 7 (Management's Discussion and Analysis of Financial Condition and Results of Operation) of our annual report on Form 10-K for the year ended December 31, 2007 and our current report on Form 8-K dated June 19, 2008, which discussion is incorporated herein by reference.

On April 18, 2008, we purchased certain natural gas futures contracts to attempt to economically hedge our exposure to cash flow variability related to the commodity component of an LNG supply contract for which we had submitted a fixed-price bid. As previously disclosed in our Form 8-K dated June 19, 2008, the supply contract for which the futures contracts were purchased was awarded to our competitor. We protested the award of the contract to our competitor and ultimately we were awarded a portion of the contract representing approximately one-third of the contract volumes. Ultimately, we realized a net loss of $0.3 million related to the sale of the futures contracts purchased with respect to the portion of the fixed-price contract that we were not awarded. The remaining futures contracts currently qualify for hedge accounting as cash flow hedges under SFAS 133.

Critical Accounting Policies

For the period covered by this report, there have been no material changes to the critical accounting policies we use and have explained in our annual report on Form 10-K for the fiscal year ended December 31, 2007.

Recently Issued Accounting Pronouncements

In September 2006, the FASB issued Statement of Financial Accounting Standards No. 157, Fair Value Measurements ("SFAS 157"), which defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles and expands disclosures about fair value measurements. SFAS 157 does not require any new fair value measurements. In February 2008, the FASB amended SFAS 157 to exclude SFAS 13, "Accounting for Leases." In addition, the FASB delayed the effective date of SFAS 157 for non-financial assets and liabilities to fiscal years beginning after November 15, 2008. We adopted the provisions of SFAS 157 related to our financial assets and liabilities on January 1, 2008, which did not have a material impact on our financial statements. In accordance with the new standard, we have provided additional disclosures which are included in the notes to our condensed consolidated financial statements. With respect to our non-financial assets and liabilities, we are currently evaluating the impact, if any, SFAS 157 may have on our financial statements.

In February 2007, the FASB issued Statement of Financial Accounting Standard No. 159, The Fair Value Option for Financial Assets and Financial Liabilities ("SFAS 159"). SFAS 159 permits entities to choose to measure certain financial instruments and other eligible items at fair value when the items are not otherwise currently required to be measured at fair value. Under SFAS 159, the decision to measure items at fair value is made at specified election dates on an irrevocable instrument-by-instrument basis. Entities electing the fair value option would be required to recognize changes in fair value in earnings and to expense upfront costs and fees associated with the item for which the fair value option is elected. Entities electing the fair value option are required to distinguish, on the face of the statement of financial position, the fair value of assets and liabilities for which the fair value option has been elected and similar assets and liabilities measured using another measurement attribute. Unrealized gains and losses arising subsequent to adoption are reported in earnings. We adopted this statement as of January 1, 2008 and elected not to apply the fair value option to any of our financial instruments.

In December 2007, the FASB finalized the provisions of the Emerging Issues Task Force ("EITF") issue No. 07-1, Accounting for Collaborative Arrangements ("EITF 07-1"). EITF 07-1 provides guidance and required financial statement disclosures for collaborative arrangement. EITF 07-01 is effective for financial statements issued for fiscal years beginning after December 15, 2008. We are currently evaluating the impact, if any, EITF 07-1 may have on our financial statements.

In December 2007, the FASB issued Statement of Financial Accounting Standards No. 141(R), Business Combinations ("SFAS 141(R)"). SFAS 141(R) provides new accounting guidance and disclosure requirements for business combinations. SFAS 141(R) is effective for business combinations which occur in the first fiscal year beginning on or after December 15, 2008.

In December 2007, the FASB issued Statement of Financial Accounting Standard No. 160, Minority Interests in Consolidated Financial Statements-an amendment of ARB No. 51("SFAS 160"). SFAS 160 provides new accounting guidance and disclosure and presentation requirements for non-controlling interests in a subsidiary. SFAS 160 is effective for the first fiscal year beginning on or after December 15, 2008. We are currently evaluating the impact, if any, SFAS 160 may have on our financial statements.

In March 2008, the FASB issued Statement of Financial Accounting Standards No. 161, "Disclosures about Derivative Instruments and Hedging Activities," an amendment of SFAS 133 ("SFAS 161"). SFAS 161 requires disclosures of how and why an entity uses derivative instruments, how derivative instruments and related . . .