flow from operations and net income and otherwise improve our results of operations substantially on a longer-term basis. Our available cash and proceeds from future financings, if any, that we may be able to obtain, may not be sufficient to fund our operating expenses, capital expenditures and other cash requirements. Any such lack of funds would affect our ability to continue to operate at current levels. These events and circumstances could have a material adverse effect on our ability to raise additional capital and on the market value of our common stock and our ability to maintain our credit facility.Notes financing. Moreover, should we experience a cash shortage that requires us to curtail or cease our operations, or should we be unable to continue to operate at current levels, youwhich could lose all or part of your investments in our securities.

Impairment charges on our long‑lived assets, including intangible assets with finite lives wouldmaterially adversely affect our financial position and results of operations.

We evaluate the carrying value of long‑lived assets, including intangible assets with finite lives, for impairment whenever events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. To determine whether impairment has occurred, we compare the undiscounted cash flows of the long‑lived asset group with its carrying value. The estimation of future cash flows requires significant estimates of factors that include future sales growth, gross margin performance, including our estimates of reductions in our direct material costs, and reductions in operating expenses. If our sales growth, gross margin performance or other estimated operating results are not achieved at or above our forecasted level, or inflation exceeds our forecast, the carrying valuemarket price of our asset group may prove to be unrecoverable and we may incur impairment charges in the future. In addition, significant and unanticipated changes in circumstances, such as significant adverse changes in business climate, unanticipated competition, loss of key customers or changes in technology or markets, could require a charge for impairment that can materially and adversely affect our reported net loss and our stockholders’ equity.common stock.

A sustainable market for microturbines may never develop or may take longer to develop than we anticipate which would adversely affect our results of operations.

Our products represent an emerging market, and we do not know whether our targeted customers will accept our technology or will purchase our products in sufficient quantities to allow our business to grow. To succeed, demand for our products must increase significantly in existing markets, and there must be strong demand for products that we introduce in the future. In addition, as part of our business strategy, we are focusing our marketing efforts on the energy

We depend upon the development of new products and enhancements of existing products.

Our operating results depend on our ability to develop and introduce new products, enhance existing products and reduce the costs to produce our products. The success of our products is dependent on several factors, including proper product definition, product cost, timely completion and introduction of the products, differentiation of products from those of our competitors, meeting changing customer requirements, emerging industry standards and market acceptance of these products. The development of new, technologically advanced products and enhancements is a complex and uncertain process requiring high levels of innovation, as well as the accurate anticipation of technological and market trends. There can be no assurance that we will successfully identify new product opportunities, develop and bring new or enhanced products to market in a timely manner, successfully lower costs and achieve market acceptance of our products, or that products and technologies developed by others will not render our products or technologies obsolete or uncompetitive.

Our operating results are dependent, in large part, upon the successful commercialization of our products. Failure to produce our products as scheduled and budgeted would materially and adversely affect our business and financial condition.

We cannot be certain that we will deliver ordered products in a timely manner. We have limited production slots for our products. Any delays in production will increase our costs, reduce future production slots and could significantly impact our business, financial condition and operating results.

We may not be able to produce our products on a timely basis if we fail to correctly anticipate product supply requirements or if we suffer delays in production resulting from issues with our suppliers. Our suppliers may not supply us with a sufficient amount of components or components of adequate quality, or they may provide components at significantly increased prices.

Some of our components are currently available only from a single source or limited sources. We may experience delays in production if we fail to identify alternative suppliers, or if any parts supply is interrupted, each of which could materially adversely affect our business and operations. In order to reduce manufacturing lead times and ensure adequate component supply, we enter into agreements with certain suppliers that allow them to procure inventories based upon criteria defined by us. If we fail to anticipate customer demand properly, an oversupply of parts could result in excess or obsolete inventories, which could adversely affect our business. Additionally, if we fail to correctly anticipate our internal supply requirements, an undersupply of parts could limit our production capacity. Our inability to meet volume commitments with suppliers could affect the availability or pricing of our parts and components. A reduction or interruption in supply, a significant increase in price of one or more components or a decrease in demand of products could materially adversely affect our business and operations and could materially damage our customer relationships. Financial problems of suppliers on whom we rely could limit our supply of components or increase our costs. Also, we cannot guarantee that any of the parts or components that we purchase will be of adequate quality or that the prices we pay for the parts or components will not increase. Inadequate quality of products from suppliers could interrupt our ability to supply quality products to our customers in a timely manner. Additionally, defects in materials or products supplied by our suppliers that are not identified before our products are placed in service by our customers could result in higher warranty costs and damage to our reputation. We also outsource certain of our components internationally. As a result of outsourcing internationally, we may be subject to delays in delivery because of regulations associated with the import/export process, delays in transportation or regional instability.

During the first quarter of Fiscal 2019, we identified a defect in one of the component parts for microturbine systems from one of our single source suppliers. As a result of this defect we have identified several new suppliers with

greater engineering expertise and robust quality management systems. The transition is complex, lengthy and may result in an interruption in our manufacturing process. An interruption in our manufacturing process for this component part would adversely impact our results of operations. The efforts to qualify and dual source these components was completed in the fourth quarter of Fiscal 2019.

During the fourth quarter of Fiscal 2018, we received notification from one of our single source suppliers that they were at maximum capacity and would require prepayment and a significant increase in the price of multiple components in order to fulfill our supply requirements for Fiscal 2019. Due to their capacity issues, it is uncertain if we will experience an interruption in parts from this supplier or be able to fully offset or recover any resulting component price increases. This could impact margins or sales in future quarters. During the first quarter of Fiscal 2019, we issued a prepayment of approximately $2.2 million to this single source supplier. A new supplier has been identified and has been fully qualified and is now working towards increasing its capacity and is expected to meet our production volumes during Fiscal 2020.

Commodity market factors impact our costs and availability of materials.

Our products contain a number of commodity materials from metals, which include steel, special high temperature alloys, copper, nickel and molybdenum, to computer components. The availability of these commodities could impact our ability to acquire the materials necessary to meet our production requirements. The cost of metals has historically fluctuated. The pricing could impact the costs to manufacture our products. If we are not able to acquire commodity materials at prices and on terms satisfactory to us or at all, our operating results may be materially adversely affected.

Adverse economic conditions may have an impact on our business and financial condition, including some effects we may not be able to predict.

Adverse economic conditions may prevent our customers from purchasing our products or delay their purchases, which would adversely affect our business, financial condition and results of operations. In addition, our ability to access the capital markets may be severely restricted or made very expensive at a time when we need, or would like, to do so, which could have a material adverse impact on our liquidity and financial resources. Certain industries in which our customers do business and certain geographic areas have been and could continue to be adversely affected by adverse economic conditions. Although we experience revenue growth in fiscal 2019, our revenue continues to be negatively impacted by the volatility of the global oil and gas markets, a strong U.S. dollar (making our products more expensive overseas) and ongoing global geopolitical tensions.

Product quality expectations may not be met, causing slower market acceptance or warranty cost exposure.

In order to achieve our goal of improving the quality and lowering the total costs of ownership of our products, we may require engineering changes. Such improvement initiatives may render existing inventories obsolete or excessive. Despite our continuous quality improvement initiatives, we may not meet customer expectations. Any significant quality issues with our products could have a material adverse effect on our rate of product adoption, results of operations, financial condition, and cash flow. Moreover, as we develop new configurations for our microturbines and as our customers place existing configurations in commercial use, our products may perform below expectations. Any significant performance below expectations could adversely affect our operating results, financial condition and cash flow and affect the marketability of our products.

We sell our products with warranties. There can be no assurance that the provision for estimated product warranty will be sufficient to cover our warranty expenses in the future. We cannot ensure that our efforts to reduce our risk through warranty disclaimers will effectively limit our liability. Any significant incurrence of warranty expense in excess of estimates could have a material adverse effect on our operating results, financial condition and cash flow. Further, we have at times undertaken programs to enhance the performance of units previously sold. For example, during Fiscal 2017, we recorded a one-time non-cash warranty provision of approximately $5.2 million to proactively retrofit select non-Signature Series C200 microturbines with the more robust new Signature Series generator components to

improve product performance and reliability. Additionally, our warranty provision was negatively impacted in Fiscal 2019 and Fiscal 2021 because of a supplier defect thatidentified in fielded units. In Fiscal 2021 a warranty reserve in the amount of $4.9 million was identified duringestablished related to reliability programs to account for the first quarterreplacement of Fiscal 2019.

remaining high risk failure parts in some of our fielded units due to a supplier defect. These enhancements have at times been provided at no cost or below our cost. If we choose to offer such programs again in the future, such actions could result in significant costs.

We operate in a highly competitive market among competitors who have significantly greater resources thanOn February 22, 2021 we have and we may not be able to compete effectively.

We compete with several technologies, including reciprocating engines, fuel cells and solar power. Competing technologies may receive certain benefits, like governmental subsidies or promotion, or be able to offer consumer rebates or other incentivesannounced that we cannot receive or offer had reached a financial settlement in the amount of $5 million arising out of claims pursued in confidential arbitration with such former strategic parts supplier. We obtained this settlement following a multi-year arbitration process.  Any future product quality issues with our parts suppliers could lead

We plan our production and inventory levels based on internal forecasts of customer demand, which is highly unpredictable and can fluctuate substantially. If sales in any period fall significantly below anticipated levels, our financial condition, results of operations and cash flow would suffer. If demand in any period increases well above anticipated levels, we may have difficulties in responding, incur greater costs to respond, or be unable to fulfill the demand in sufficient time to retain the order, which would negatively impact our operations. In addition, our operating expenses are based on anticipated sales levels, and a high percentage of our expenses are generally fixed in the short term. As a result of these factors, a small fluctuation in timing of sales can cause operating results to vary materially from period to period.

Net product orders for Fiscal 20192021 were $46.2$25.9 million and contributed to an ending backlog of $71.3$29.4 million at March 31, 2019.2021. The book-to-bill ratio was 1.1:1 for Fiscal 2019.2021. Book-to-bill ratio is the ratio of new orders we received to units shipped and billed during a period. However, because our backlog represents only the estimated amount of future product revenue to be recognized under negotiated contracts as shipments convert backlog to recognized revenue for accounting purposes, we may not be able to fully realize the revenue value reported in our backlog, and our backlog may not be indicative of future revenues. A portion of our backlog is concentrated in the international oil and gas market which may impact the overall timing of shipments or the conversion of backlog to revenue. The timing of the backlog is based on the requirement date indicated by our customers. Based on historical experience, management expects that a significant portion of our backlog may not be shipped within the next 18 months. The timing of shipments is subject to change based on several variables (including customer deposits, payments, availability of credit and customer delivery schedule changes), most of which are not in our control and can affect the timing of our revenue. As a result, management believes the book-to-bill ratio better demonstrates the current demand for our products in the given period.

On October 13, 2017, we entered into an Accounts Receivable Assignment Agreement (the “Assignment Agreement”) and Promissory Note (the “Note”) with Turbine International, LLC (“TI”). 

Pursuant to the terms of the Assignment Agreement, we agreed to assign to TI the right, title and interest to receivables owed to us from BPC Engineering, our former Russian distributor (“BPC”), upon TI’s payment to us of $2.5 million in three payments by February 1, 2018. We received payments from TI of approximately $1.0 million under the Assignment Agreement during Fiscal 2018, which was recorded as bad debt recovery. The receivables owed to us from BPC had a balance of $4.8 million as of March 31, 2019, and this balance was fully reserved.

On October 13, 2017, we and Hispania Petroleum, S.A. (the “Guarantor”), entered into a Guaranty Agreement (the “Guaranty Agreement”) whereby the Guarantor guarantees TI’s obligations under the Agreement and Note. However, due to our limited business relationship with TI and the missed payments on the Assignment Agreement, we deferred recognition of the Assignment Agreement and Note until collectability is reasonably assured. 

In connection with the terms of the Note, we granted TI the sole distribution rights for our products and services in the Russian oil and gas sector. As a result of this appointment, TI agreed to pay us $3.8 million over a three-year period in 35 equal monthly installments starting in August 2018. 

On June 5, 2018, we entered into an amendment to the Assignment Agreement (the “Amended Assignment Agreement”) and the Note (the “Amended Note”) with TI. Pursuant to the terms of the Amended Assignment Agreement, the right, title and interest to receivables owed to us from BPC will be contingent upon TI’s payment to us of the remaining approximately $1.5 million in five payments by September 20, 2019. We collected approximately $0.5 million from TI during Fiscal 2019, under the terms of the Amended Assignment Agreement. Under the terms of the Amended Note, TI agreed to pay us $3.8 million over a three-year period in 13 equal quarterly installments starting in December 20, 2019. As of March 31, 2019, the right, title and interest to the accounts receivables owed to us from BPC had not been assigned to TI, as TI had not yet made all payments as required under the Amended Assignment Agreement. The payment of $0.4 million, due March 20, 2019 under the Amended Assignment Agreement, has not been received at the time of this filing.

Due to the above amendments, during the three months ended March 31, 2018 we removed product orders related to BPC from backlog for approximately $7.2 million. This removal was the result of product pricing that we no longer would honor. Additionally, for Fiscal 2019, we removed product orders related to BPC from backlog for

approximately $20.7 million. This removal was the result of our continuous review of BPC related backlog with TI which resulted in us no longer honoring the product pricing. After removal of the foregoing orders, the remaining backlog related to BPC as of March 31, 2019 comprises up to approximately 42% of our total backlog. This remaining backlog related to BPC continues to be reviewed with TI and the other new distributors in the region, and they have the right to request delivery of those backlog orders if the associated projects proceed. Nonetheless, the remaining backlog related to BPC may be negatively impacted.

If we do not effectively implement our sales, marketing and service plans, our sales will not grow and our results of operations will suffer.

Our sales and marketing efforts may not achieve intended results and, therefore, may not generate the revenue we anticipate. As a result of our corporate strategies, we have decided to focus our resources on selected vertical markets. We may change our focus to other markets or applications in the future. There can be no assurance that our focus or our near term plans will be successful. If we are not able to address markets for our products successfully, we may not be able to grow our business, compete effectively or achieve profitability.

Our business and financial performance depends in part on the oil and natural gas industry, and a decline in prices for oil and natural gas may have an adverse effect on our revenue, cash flows, profitability and growth.

The significant decline in oil and natural gas prices beginning in late 2014 caused a reduction in our customers' spending and associated drilling and completion activities, which had an adverse effect on our revenue for multiple years. Although we have experienced an improvement in revenue during Fiscal 2019 due to favorable oil prices, we continue to be impacted by the volatility of the global oil and gas industry. If prices were to decline again, we would expect to see similar declines in our customers' spending which would have an adverse effect on our revenue. In addition, a worsening of these conditions may result in a material adverse impact on certain of our customers' liquidity and financial position resulting in further spending reductions, delays in the collection of amounts owing to us and similar impacts.

Our sales and results of operations could be materially and adversely impacted by risks inherent in international markets.

As we expand in international markets, customers may have difficulty or be unable to integrate our products into their existing systems or may have difficulty complying with foreign regulatory and commercial requirements. As a result, our products may require redesign. Any redesign of the product may delay sales or cause quality issues. In addition, we may be subject to a variety of other risks associated with international business, including import/export restrictions, fluctuations in currency exchange rates and economic or political instability. Our business in particular is also subject to risks relating to uncertainties and effects of the implementation of the United Kingdom’s referendum to withdraw membership from the EU (referred to as “Brexit”), including financial, legal, tax and trade implications. In addition, doing business internationally subjects us to risks relating to political or social unrest, as well as corruption and government regulation, including U.S. laws such as the Foreign Corrupt Practices Act and the U.K. Bribery Act, that impose stringent requirements on how we conduct our foreign operations. If any of these events occur, our businesses may be adversely affected.

Changes to trade regulation, quotas, duties or tariffs, and sanctions caused by the changing U.S. and geopolitical environments or otherwise, may increase our costs or limit the amount of raw materials and products that we can import, or may otherwise adversely impact our business.

The currentformer U.S. administration has voiced strong concerns about imports from countries that it perceives as engaging in unfair trade practices, andpractices. Any current or future U.S. administration may decide to impose import duties or other restrictions on products, components or raw materials sourced from those countries, which may include China, Mexico, and other countries from which we import components or raw materials. Any such duties or restrictions could have a material adverse effect on our business, results of operations or financial condition.

Moreover, theseany new tariffs, or other changes in U.S. trade policy, could trigger retaliatory actions by affected countries. Certain foreign governments have instituted or are considering imposing trade sanctions on certain U.S. goods. Others are considering the imposition of sanctions that will deny U.S. companies access to critical raw materials. A “trade war” of this nature or other governmental action related to tariffs or international trade agreements or policies has the

successful, we may lose sales opportunities, customers, and revenues. Our agreements with our distribution partners require them to comply with performance conditions that are subject to interpretation, which could result in disagreements. At any given time, we may be in disputes with one or more distribution partners. Any such dispute could result in lengthy and costly litigation, even if the outcome is ultimately in our favor. We cannot predict the outcome of any arbitration or litigation, the effect of any negative judgment against us or the amount of any settlement that we may enter into with such distribution partners. A contractual dispute with a distribution partner may result in our or our distribution partner seeking to terminate the related distribution agreement, even if such termination would be wrongful, which could harm our business, or interfere with a previously agreed wind down of the relationship or transition of end-user service agreements. Any prolonged disruptions of our distribution channels that results from the termination of one or more of our distributions or our failure to renew our distribution agreements with our desired distributors, could negatively affect our ability to effectively sell our products and would materially and adversely affect our business, financial condition, results of operations and prospects.

received at the time of this filing.cash flows.

Loss of a significant customer could have a material adverse effect on our results of operations.

E-FinityCAL and CALE-Finity accounted for approximately 13%15% and 12%, respectively, of our revenue for Fiscal 2019.2021. Additionally, RSP and E-Finity accounted for 14% and 10%, respectively,13% of net accounts receivable as of March 31, 2019.2021. The loss of E-Finity, CAL, RSP,E-Finity or any other significant customer could have a material adverse effect on our results of operations and financial condition.

We may not be able to develop sufficiently trained applications engineering, installation and service support to serve our targeted markets.

Our ability to identify and develop business relationships with companies who can provide quality, cost‑effective application engineering, installation and service can significantly affect our success. The application engineering and proper installation of our microturbines, as well as proper maintenance and service, are critical to the performance of the units. Additionally, we need to reduce the total installed cost of our microturbines to enhance market opportunities. Our inability to improve the quality of applications, installation and service while reducing associated costs could affect the marketability of our products.

Changes in our product components may require us to replace parts held at distributors.

We have entered into agreements with some of our distributors requiring that if we render parts obsolete in inventories they own and hold in support of their obligations to serve fielded microturbines, we are required to replace the affected stock at no cost to the distributors. It is possible that future changes in our product technology could involve costs that have a material adverse effect on our results of operations, cash flow or financial position.

We operate in a highly regulated business environment, and changes in regulation could impose significant costs on us or make our products less economical, thereby affecting demand for our microturbines.

Our products are subject to federal, state, local and foreign laws and regulations, governing, among other things, emissions and occupational health and safety. Regulatory agencies may impose special requirements for the implementation and operation of our products or that may significantly affect or even eliminate some of our target markets. We may incur material costs or liabilities in complying with government regulations. In addition, potentially significant expenditures could be required in order to comply with evolving environmental and health and safety laws, regulations and requirements that may be adopted or imposed in the future. Furthermore, our potential utility customers must comply with numerous laws and regulations. The deregulation of the utility industry may also create challenges for our marketing efforts. For example, as part of electric utility deregulation, federal, state and local governmental authorities may impose transitional charges or exit fees, which would make it less economical for some potential customers to switch to our products. We can provide no assurances that we will be able to obtain these approvals and changes in a timely manner, or at all. Non‑compliance with applicable regulations could have a material adverse effect on our operating results.

The market for electricity and generation products is heavily influenced by federal and state government regulations and policies. The deregulation and restructuring of the electric industry in the United States and elsewhere may cause rule changes that may reduce or eliminate some of the advantages of such deregulation and restructuring. We cannot determine how any deregulation or restructuring of the electric utility industry may ultimately affect the market for our microturbines. Changes in regulatory standards or policies could reduce the level of investment in the research and development of alternative power sources, including microturbines. Any reduction or termination of such programs could increase the cost to our potential customers, making our systems less desirable, and thereby adversely affect our revenue and other operating results.

Utility companies or governmental entities could place barriers to our entry into the marketplace, and we may not be able to effectively sell our products.

Utility companies or governmental entities could place barriers on the installation of our products or the interconnection of the products with the electric grid. Further, they may charge additional fees to customers who install on‑site generation or have the capacity to use power from the grid for back‑up or standby purposes. These types of restrictions, fees or charges could hamper the ability to install or effectively use our products or increase the cost to our potential customers for using our systems. This could make our systems less desirable, thereby adversely affecting our revenue and other operating results. In addition, utility rate reductions can make our products less competitive which would have a material adverse effect on our operations. The cost of electric power generation bears a close relationship to natural gas and other fuels. However, changes to electric utility tariffs often require lengthy regulatory approval and include a mix of fuel types as well as customer categories. Potential customers may perceive the resulting swings in natural gas and electric pricing as an increased risk of investing in on‑site generation.

We may not achieve production cost reductions necessary to competitively price our products, which would adversely affect our sales.

We believe that we will need to reduce the unit production cost of our products over time to maintain our ability to offer competitively priced products. Our ability to achieve cost reductions will depend on our ability to develop low cost design enhancements, to obtain necessary tooling and favorable supplier contracts and to increase sales volumes so we can achieve economies of scale. We cannot provide assurance that we will be able to achieve any such production cost reductions. Our failure to achieve such cost reductions could have a material adverse effect on our business and results of operations.

We have effectedrealized reductions in our operating costs and, as a result, our ability to cut costs further and sustain our business initiatives may be limited.

Beginning inSince April 2015, we have implemented various initiatives to reduce operating costs across all functions of the Company and focus our business efforts on our most promising near-term product opportunities. As a result of these cost-cutting initiatives, which we have already undertaken over an extended period of time, we may have a more limited ability to further reduce costs to increase our liquidity should such measures become necessary. Any further reductions may have a materially negative impact on our business.

Potential intellectual property, labor, product liability, stockholder or other litigation may adversely impact our business.

From time to time, we may face litigation relating to intellectual property, labor, product liability, stockholder and other matters. An adverse judgment could negatively impact our financial position and results of operations, the trading price of our common stock and our ability to obtain future financing on favorable terms or at all. Whether or not resolved in a manner adverse to us, any litigation could be costly, divert management attention or result in increased costs of doing business. Further, our insurance coverage is limited for these and other claims against us, and we may not have adequate insurance or financial resources to pay for our liabilities or losses from any such claims.

Our business could be negatively impacted if we fail to adequately protect our intellectual property rights or if third parties claim that we are in violation of their intellectual property rights.

We view our intellectual property rights as important assets. We seek to protect our intellectual property rights through a combination of patent, trademark, copyright and trade secret laws, as well as licensing and confidentiality agreements. These protections may not be adequate to prevent third parties from using our intellectual property without our authorization, breaching any confidentiality agreements with us, copying or reverse engineering our products, or developing and marketing products that are substantially equivalent to or superior to our own. The unauthorized use of our intellectual property by others could reduce our competitive advantage and harm our business. If it became necessary for us to litigate to protect these rights, any proceedings could be burdensome and costly and we may not prevail. We cannot guarantee that any patents, issued or pending, will provide us with any competitive advantage or will not be challenged by third parties. Moreover, the expiration of our patents may lead to increased competition with respect to

certain products. In addition, we cannot be certain that we do not or will not infringe third parties’ intellectual property rights. Any such claim, even if it is without merit, may be expensive and time‑consuming to defend, subject us to damages, cause us to cease making, using or selling certain products that incorporate the disputed intellectual property, require us to redesign our products, divert management time and attention and/or require us to enter into costly royalty or licensing arrangements.

We face security and cybersecurity risks related to our electronic processing of sensitive and confidential business and product data. If we are unable to protect our data or the data of our customers, a security breach could damage our reputation and have a material adverse effect on our business.

As a manufacturer of high technology commercial products, we face security and cyber security threats, as well as the potential for business disruptions associated with information technology failures or cyber security attacks. Given the nature of our business, we collect process and retain sensitive and confidential customer and associate data, in addition to proprietary business information. Our business, including our turbines and related energy assets may be vulnerable to a data compromise, computer viruses, physical and electronic break-ins and manipulations and similar disruptions, which may not be prevented by our efforts to secure our computer systems and assets, which include vulnerability scans and patching, network firewalls, identity and access management, data encryption, intrusion detection and prevention devices. Regular penetration tests of our networks are conducted by a third party service provider and we leverage any findings to further enhance our security. We also employ secure file transfer options to provide security for processing, transmission and storage of confidential information. Our critical data is backed up to a separate secured data storage facility. However, our efforts may not be able to prevent rapidly evolving types of cyber-attacks and a successful breach of our computer systems could result in misappropriation of personal, payment or sensitive business information. In addition, we rely on associates, contractors and other third parties who may attempt to circumvent our security measures in order to obtain such information, and may purposefully or inadvertently cause a breach involving such information. A security breach involving confidential and proprietary data or the fleet of turbines we have deployed across the globe for our customers could damage our reputation and our ability to retain existing customers or gain new customers. The competitive advantages derived from our R&D efforts, the usefulness of our products and services, our reputation and our stock price could be impacted.  In addition, we may incur material liabilities and remediation costs as a result of a security breach and, our insurance may not be sufficient to cover the impact to the business. Although we have developed mitigating security controls to reduce our cyber risk and protect our data and our products, our customers’ data and our customers’ turbines from a security breach, such measures cannot provide absolute security and accordingly any security breach may have a material adverse effect on our business.  Moreover, changing privacy laws in the United States, Europe and elsewhere, including the adoption by the European Union of the General Data Protection Regulation (“GDPR”), which became effective May 2018, creates new individual privacy rights and imposes increased obligations on companies handling personal data. Consequently, we may incur significant costs related to prevention and compliance with laws regarding the protection and unauthorized disclosure of personal information. A failure to comply with the stringent rules of the GDPR could result in fines of up to €20 million.

We may incur costs and liabilities as a result of product liability claims.

We face a risk of exposure to product liability claims in the event that the use of our products is alleged to have resulted in injury or other damage. Although we currently maintain product liability insurance coverage, we may not be able to obtain such insurance on acceptable terms in the future, if at all, or obtain insurance that will provide adequate coverage against potential claims. Product liability claims can be expensive to defend and can divert the attention of management and other personnel for long periods of time, regardless of the ultimate outcome. A significant unsuccessful product liability defense could have a material adverse effect on our financial condition and results of operations. In addition, we believe our business depends on the strong brand reputation we have developed. If our reputation is damaged, we may face difficulty in maintaining our market share and pricing with respect to some of our products, which could reduce our sales and profitability.

We have significant tax assets, usage of which may be subject to limitations in the future.

At March 31, 2019, we had federal and state net operating loss carryforwards of approximately $643.2 million and $153.6 million, respectively, which may be utilized to reduce future taxable income, subject to limitations under

Section 382 of the Internal Revenue Code of 1986. These deferred tax assets have been fully offset by a valuation allowance. Any subsequent accumulations of common stock ownership leading to a change of control under Section 382 of the U.S. Internal Revenue Code of 1986, including through sales of stock by large stockholders, all of which are outside of our control, could limit and defer our ability to utilize our net operating loss carryforwards to offset future federal income tax liabilities.

Activities necessary to integrate any future acquisitions may result in costs in excess of current expectations or be less successful than anticipated.

We may acquire other businesses in the future and the success of these transactions will depend on, among other things, our ability to develop productive relationships with the corresponding distributors and to integrate assets and personnel, if any, acquired in these transactions and to apply our internal controls processes to these acquired businesses. The integration of any acquired businesses or significant assets may require significant attention from our management, and the diversion of management’s attention and resources could have a material adverse effect on our ability to manage our business. Furthermore, we may not realize the degree or timing of benefits we anticipated when we first enter into these transactions. If actual integration costs are higher than amounts assumed, if we are unable to integrate the assets and personnel acquired in an acquisition as anticipated, or if we are unable to fully benefit from anticipated synergies, our business, financial condition, results of operations, and cash flows could be materially adversely affected.

Operational restructuring may result in asset impairment or other unanticipated charges.

As a result of our corporate strategy, we have identified opportunities to outsource to third‑partythird-party suppliers certain functions which we currently perform. We believe outsourcing can reduce product costs, improve product quality and increase operating efficiency. These actions may not yield the expected results, and outsourcing may result in production delays or lower quality products. Transitioning to outsourcing may cause certain of our affected employees to leave before the outsourcing is complete. This could result in a lack of the experienced in‑housein-house talent necessary to successfully

Our operations are vulnerable to interruption by fire, earthquake and other events beyond our control.

Our operations are vulnerable to interruption by fire, earthquake, and other events beyond our control. Our executive offices, manufacturing facility, and auxiliary inventory storage facility are located in southern California. Because the southern California area is located in an earthquake‑sensitiveearthquake-sensitive area and because we have no redundancy facility located within or outside of southern California, we are particularly susceptible to the risk of damage to, or total destruction of, our facilities in southern California and the surrounding transportation infrastructure, which could affect our ability to make and transport our products. If an earthquake, fire, or other natural disaster occurs at or near our facilities, our business, financial condition, operating results and cash flow could be materially adversely affected.

Activities necessary to integrate any future acquisitions may result in costs in excess of current expectations or be less successful than anticipated.

We may acquire other businesses in the future and the success of these transactions will depend on, among other things, our ability to develop productive relationships with the corresponding distributors and to integrate assets and personnel, if any, acquired in these transactions and to apply our internal controls processes to these acquired businesses. Future acquisitions may require us to raise financing including by issuing common stock that would dilute our current stockholders’ percentage ownership, assume or otherwise be subject to liabilities of an acquired company, record goodwill and non-amortizable intangible assets that will be subject to impairment testing on a regular basis and potential periodic

additional 180-day period ifshares of our common stock in “at-the-market’ offerings pursuant to the closing bidsales agreement entered into with H.C. Wainwright & Co., LLC on June 7, 2018 and as amended on July 15, 2020 and March 29, 2021. The sale of a substantial number of shares of our common stock pursuant to the sales agreement, or anticipation of such sales, could cause the trading price of our common stock is at least $1.00 per shareto decline or make it more difficult for a minimum of 10 consecutive business days by November 18, 2019. If we failus to regain compliance onsell equity or prior to November 18, 2019, our stock will be subject to delisting by Nasdaq. We provided written notice of our intention to cure the minimum bid price deficiency during this additional 180-day period by effecting a reverse stock split if necessary. If we deem a reverse stock split necessary, we will request stockholder approval at our annual meeting of stockholders, to be held on August 30, 2019.

If we fail to meet all applicable Nasdaq Capital Market requirementsequity-related securities in the future at a time and Nasdaq determines to delistat a price that we might otherwise desire. In addition, issuances of any shares of our common stock sold pursuant to the delisting could adversely affectsales agreement will have a dilutive effect on our existing stockholders.

We cannot predict the effect, if any, that future public sales of our common stock or the availability of additional shares of our common stock for sale will have on the market liquidityand trading price of our common stock. In addition, we currently have warrants outstanding for the purchase of up to an aggregate of 1.1 million shares of our common stock and adversely affect our ability to obtain financing for the continuationcertain of our operations. This delistingwarrant holders also have the right to require us to register under the Securities Act the shares issuable upon exercise of their warrants. In addition, some of our outstanding warrants contain anti-dilution provisions that may, under certain circumstances, increase the number of shares issuable thereunder. To the extent the warrants outstanding are fully exercised, a significant number of shares of common stock will be issued, which will result in dilution to the holders of our shares of common stock and an increase in the number of shares eligible for resale in the public market. If any of our stockholders sell substantial amounts of our common stock in the public market, or if the public perceives that such sales could also impairoccur, this could have an adverse impact on the valuemarket and trading price of your investment.our securities, even if there is no relationship between such sales and the performance of our business.

The market price of our common stock has been, and may continue to be, highly volatile and you could lose all or part of your investment in our securities.

An investment in our securities is risky, and stockholders could lose their investment in our securities or suffer significant losses and wide fluctuations in the market value of their investment. The market price of our common stock is highly volatile and is likely to continue to be highly volatile. Given the continued uncertainty surrounding many variables that may affect our business and the industry in which we operate, our ability to foresee results for future periods is limited. This variability could affect our operating results and thereby adversely affect our stock price. Many factors that contribute