EXHIBIT 99.1

TPI Composites, Inc. Announces Third Quarter 2017 Earnings Results and Long-term Supply Agreement with Proterra

SCOTTSDALE, Ariz., Nov. 08, 2017 (GLOBE NEWSWIRE) -- TPI Composites, Inc. (Nasdaq:TPIC), the only independent manufacturer of composite wind blades with a global footprint, today reported financial results for the third quarter ended September 30, 2017.

Highlights

For the quarter ended September 30, 2017:

• Net sales of $243.4 million
• Total billings of $256.4 million
• Net income of $20.4 million or $0.58 per diluted share
• EBITDA of $29.1 million, with an EBITDA margin of 12.0%
• Adjusted EBITDA of $30.1 million, with an Adjusted EBITDA margin of 12.4%

1. Number of wind blade sets (which consist of three wind blades) invoiced worldwide in the period.
2. Estimated megawatts of energy capacity to be generated by wind blade sets invoiced in the period.
3. Number of wind blade manufacturing lines that are dedicated to our customers under long-term supply agreements.
4. Number of wind blade manufacturing lines installed and either in operation, startup or transition.
5. Number of wind blade manufacturing lines in a startup phase during the period.
6. Number of wind blade manufacturing lines that were being transitioned to a new wind blade model during the period.

“We are pleased with our strong operational and financial performance in the third quarter of 2017 in which we again exceeded our adjusted EBITDA targets,” said Steve Lockard, TPI Composites’ President and Chief Executive Officer. “Our results were driven by a 21% increase in blades delivered, reductions in manufacturing cycle times, improvements in productivity and shared gain from material cost out efforts. We reported another quarter of year-over-year increases in net sales, total billings, EBITDA and adjusted EBITDA.”

“We also announced today the signing of a new, five-year supply agreement with Proterra, Inc. to be the supplier of composite bus bodies for Proterra’s Catalyst® zero-emission electric buses from our existing Rhode Island manufacturing facility and from a new U.S. manufacturing facility in Newton, Iowa that TPI expects to open in the first half of 2018. Under the new supply agreement, that includes exclusivity for a portion of the term, TPI has committed to providing up to 3,350 composite bus bodies over the term of the agreement. We are very pleased to be expanding and extending our relationship with Proterra.”

“We expect to finish the year strong and are narrowing our full year guidance on total billings to between $945 million to $950 million. We currently have approximately $4.4 billion in contract value through 2023, including 48 wind blade manufacturing lines and our transportation production lines along with a strong pipeline of global opportunities including current and new customers, and both onshore and offshore blades, all of which support our growth targets. As we discussed last quarter, there are some industry headwinds that will meaningfully lower our year-over-year growth in 2018 and will have a residual impact on our growth through 2019 including the trend in some non-U.S. markets of transitioning to auction-based systems and U.S. market demand shifts driven by the current PTC cycle. However, the most significant driver of our lower growth in 2018 will be the unusually high number of lines in transition, expected to be 14, along with the ramp up of the backfill lines in Turkey and China and lines currently under contract that won’t be installed until the second half of 2018. In addition to driving down LCOE in 2019 and 2020, we expect these transitions and startups will position us nicely for strong growth in 2019 and beyond. Notwithstanding, we are revising our revenue CAGR target to 20% to 25% through 2019.”

Third Quarter 2017 Financial Results
Net sales for the quarter increased 22.3% to $243.4 million compared to the same period in 2016. Net sales of wind blades increased by 20.3% to $233.5 million for the third quarter of 2017 as compared to the third quarter of 2016. The increase was primarily driven by a 21% increase in the number of wind blades delivered during the third quarter compared to the same period in 2016 primarily from our China, Mexico and Turkey plants, partially offset by a decline in the average sales prices of the same blade models delivered in both periods as a result of geographic mix and savings in raw material costs, a portion of which we share with our customers. Total billings for the third quarter increased by $60.3 million or 30.8% to $256.4 million compared to the same period in 2016. The favorable impact of the currency movements on consolidated net sales and total billings were 1.0% and 0.9%, respectively, for the quarter.

Gross profit for the quarter totaled $32.9 million, an increase of $10.7 million over the same period of 2016 and our gross profit margin increased by 230 basis points to 13.5%, notwithstanding the fact that we had 10 manufacturing lines in startup during the third quarter of 2017 compared to just 2 lines in the third quarter of 2016. The increase in gross margin was driven primarily by continued operating efficiencies, the impact of savings in raw materials costs and the net benefit of a stronger U.S. dollar.

Startup and transition costs in the third quarter were $12.4 million as compared to $5.1 million during the same period a year ago. The increase in Q3 2017 relates to our new plants in Mexico and Turkey and the startup of new wind blade models for certain of our customers in Turkey and Dafeng, China.

Net income for the three months ended September 30, 2017 was $20.4 million as compared to $2.8 million in the same period in 2016. The increase was primarily due to the reasons set forth above.

Net income attributable to preferred shareholders was $0.6 million for the three months ended September 30, 2016 and there was none in the 2017 period as following our IPO in July 2016, all of the previously outstanding preferred shares were converted to common shares.

Net income attributable to common shareholders was $20.4 million for the three months ended September 30, 2017, compared to $2.2 million in the same period in 2016. This increase was primarily due to the improved operating results discussed above. Diluted earnings per share was $0.58 for the three months ended September 30, 2017, compared to $0.08 for the three months ended September 30, 2016.

EBITDA for three months ended September 30, 2017 increased to $29.1 million, compared to $11.3 million during the same period in 2016. The EBITDA margin increased to 12.0% compared to 5.7% in the 2016 period. Adjusted EBITDA for three months ended September 30, 2017 increased to $30.1 million compared to $19.6 million during the same period a year ago. The Adjusted EBITDA margin increased to 12.4% in Q3 2017, compared to 9.9% during the same period a year ago.

Capital expenditures were $8.6 million for three months ended September 30, 2017 compared to $4.7 million during the same period a year ago. Capex is primarily related to new facilities and expansion or improvements at existing facilities and costs to enhance our information technology systems.

We ended the quarter with $139.1 million of cash and cash equivalents and net cash was $3.6 million as compared to net debt of $6.4 million as of December 31, 2016.

Conference Call and Webcast Information

TPI Composites will host an investor conference call this afternoon, Wednesday, November 8, 2017 at 5:00pm ET. Interested parties are invited to listen to the conference call which can be accessed live over the phone by dialing 1-877-407-9208, or for international callers, 1-201-493-6784. A replay will be available two hours after the call and can be accessed by dialing 1-844-512-2921, or for international callers, 1-412-317-6671. The passcode for the live call and the replay is 13671605. The replay will be available until November 15, 2017. Interested investors and other parties may also listen to a simultaneous webcast of the conference call by logging onto the Investor Relations section of the Company’s website at www.tpicomposites.com. The online replay will be available for a limited time beginning immediately following the call.

About TPI Composites, Inc.

TPI Composites, Inc. is the only independent manufacturer of composite wind blades for the wind energy market with a global manufacturing footprint. TPI delivers high-quality, cost-effective composite solutions through long-term relationships with leading global manufacturers. TPI is headquartered in Scottsdale, Arizona and operates factories throughout the U.S., Mexico, China and Turkey.

Forward-Looking Statements

This release contains forward-looking statements which are made pursuant to safe harbor provisions of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include statements, among other things, concerning: effects on our financial statements and our financial outlook; our business strategy, including anticipated trends and developments in and management plans for our business and the wind industry and other markets in which we operate; our projected annual revenue growth; our ability to backfill molds with respect to GE supply contracts that are not renewed; competition; future financial results, operating results, revenues, gross margin, operating expenses, products, projected costs, warranties, our ability to improve our operating margins, and capital expenditures. These forward-looking statements are often characterized by the use of words such as “estimate,” “expect,” “anticipate,” “project,” “plan,” “intend,” “seek,” “believe,” “forecast,” “foresee,” “likely,” “may,” “should,” “goal,” “target,” “might,” “will,” “could,” “predict,” “continue” and the negative or plural of these words and other comparable terminology. Forward-looking statements are only predictions based on our current expectations and our projections about future events. You should not place undue reliance on these forward-looking statements. We undertake no obligation to update any of these forward-looking statements for any reason. These forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to differ materially from those expressed or implied by these statements. These factors include, but are not limited to, the matters discussed in “Risk Factors” in our Annual Report on Form 10-K and other reports that we will file with the SEC.

Non-GAAP Definitions

This press release includes unaudited non-GAAP financial measures, including total billings, EBITDA, adjusted EBITDA, net debt and free cash flow. We define total billings as the total amounts we have invoiced our customers for products and services for which we are entitled to payment under the terms of our long-term supply agreements or other contractual arrangements. We define EBITDA as net income plus interest expense (including losses on extinguishment of debt and net of interest income), income taxes and depreciation and amortization. We define adjusted EBITDA as EBITDA plus any share-based compensation expense plus or minus any gains or losses from foreign currency transactions. We define net debt as the total principal amount of debt outstanding less unrestricted cash and cash equivalents. We define free cash flow as net cash flow generated from operating activities less capital expenditures. We present non-GAAP measures when we believe that the additional information is useful and meaningful to investors. Non-GAAP financial measures do not have any standardized meaning and are therefore unlikely to be comparable to similar measures presented by other companies. The presentation of non-GAAP financial measures is not intended to be a substitute for, and should not be considered in isolation from, the financial measures reported in accordance with GAAP. See below for a reconciliation of certain non-GAAP financial measures to the comparable GAAP measures.

Investor Relations
480-315-8742
investors@TPIComposites.com

EXHIBIT 99.2

Q3 2017 Earnings Call November 8, 2017

November 8 , 2017 2 Legal Disclaimer This presentation contains forward - looking statements within the meaning of the federal securities laws . All statements other than statements of historical facts contained in this presentation, including statements regarding our future results of operations and financial position, business strategy and plans and objectives of management for future operations, are forward - looking statements . In many cases, you can identify forward - looking statements by terms such as “may,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “target,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential” or “continue” or the negative of these terms or other similar words . Forward - looking statements contained in this presentation include, but are not limited to, statements about (i) growth of the wind energy market and our addressable market ; (ii) the potential impact of GE’s acquisition of LM Wind Power upon our business ; (iii) our future financial performance, including our net sales, cost of goods sold, gross profit or gross margin, operating expenses, ability to generate positive cash flow, and ability to achieve or maintain profitability ; (iv) the sufficiency of our cash and cash equivalents to meet our liquidity needs ; (v) our ability to attract and retain customers for our products, and to optimize product pricing ; (vi) competition from other wind blade manufacturers ; (vii) the discovery of defects in our products ; (viii) our ability to successfully expand in our existing markets and into new international markets ; (ix) worldwide economic conditions and their impact on customer demand ; (x) our ability to effectively manage our growth strategy and future expenses ; (xi) our ability to maintain, protect and enhance our intellectual property ; (xii) our ability to comply with existing, modified or new laws and regulations applying to our business ; (xiii) the attraction and retention of qualified employees and key personnel ; and (xiv) changes in domestic or international government or regulatory policy, including without limitation, changes in tax policy . These forward - looking statements are only predictions . These statements relate to future events or our future financial performance and involve known and unknown risks, uncertainties and other important factors that may cause our actual results, levels of activity, performance or achievements to materially differ from any future results, levels of activity, performance or achievements expressed or implied by these forward - looking statements . Because forward - looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified, you should not rely on these forward - looking statements as guarantees of future events . Further information on the factors, risks and uncertainties that could affect our financial results and the forward - looking statements in this presentation are included in our filings with the Securities and Exchange Commission and will be included in subsequent periodic and current reports we make with the Securities and Exchange Commission from time to time, including in our Annual Report on Form 10 - K for the year ended December 31 , 2016 . The forward - looking statements in this presentation represent our views as of the date of this presentation . We anticipate that subsequent events and developments will cause our views to change . However, while we may elect to update these forward - looking statements at some point in the future, we undertake no obligation to update any forward - looking statement to reflect events or developments after the date on which the statement is made or to reflect the occurrence of unanticipated events except to the extent required by applicable law . You should, therefore, not rely on these forward - looking statements as representing our views as of any date after the date of this presentation . Our forward - looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures, or investments we may make . This presentation includes unaudited non - GAAP financial measures including total billings , EBITDA, adjusted EBITDA, net debt and free cash flow . We define total billings as the total amounts we have invoiced our customers for products and services for which we are entitled to payment under the terms of our long - term supply agreements or other contractual agreements . We define EBITDA as net income (loss) attributable to the Company plus interest expense ( including losses on the extinguishment of debt and net of interest income), income taxes and depreciation and amortization . We define Adjusted EBITDA as EBITDA plus any share - based compensation expense, plus or minus any gains or losses from foreign currency remeasurement . We define net debt as the total principal amount of debt outstanding less unrestricted cash and cash equivalents . We define free cash flow as net cash flow generated from operating activities less capital expenditures . We present non - GAAP measures when we believe that the additional information is useful and meaningful to investors . Non - GAAP financial measures do not have any standardized meaning and are therefore unlikely to be comparable to similar measures presented by other companies . The presentation of non - GAAP financial measures is not intended to be a substitute for, and should not be considered in isolation from, the financial measures reported in accordance with GAAP . See the appendix for the reconciliations of certain non - GAAP financial measures to the comparable GAAP measures . This presentation also contains estimates and other information concerning our industry that are based on industry publications, surveys and forecasts . This information involves a number of assumptions and limitations, and we have not independently verified the accuracy or completeness of the information .

November 8 , 2017 3 Agenda • Q3 2017 Highlights • Industry Update • Q3 and Year to Date 2017 Financial Highlights • Guidance for 2017 • Q&A • Appendix - Non - GAAP Information

November 8 , 2017 4 Q3 2017 Highlights

November 8 , 2017 5 Q3 2017 Highligh ts Q3 2017 Highlights and Recent Company News $569 $683 $199 $243 $0 $200 $400 $600 $800 YTD 2016 YTD 2017 Q3 '16 Q3 '17 GAAP Net Sales ($ in millions) Sets invoiced 1,613 2,067 581 739 Est. MW 3, 686 4, 876 1,321 1, 796 Dedicated lines (1) 38 48 38 48 Lines installed (2) 3 2 41 32 38 (1) Number of wind blade manufacturing lines dedicated to our customers under long - term supply agreements (2) Number of wind blade manufacturing lines installed that are either in operation , startup or transition  Operating results and year - over - year increases compared to the third quarter 201 6 • Net sales were up 22.3 % to $243.4 million for the quarter • Total billings were up 30.8 % to $ 256.4 million for the quarter • Net income for the quarter increased to $ 20.4 million versus $ 2.8 million in Q3 2016 • Adjusted EBITDA for the quarter increased by 53.4% to $ 30.1 million • Adjusted EBITDA margin for the quarter was up 250 bps to 12.4 %  Signed a multiyear supply agreement with Senvion for two manufacturing lines in Taicang Port, China  Signed a five - year supply agreement with Proterra to become the supplier of composite bus bodies for their Catalyst ® zero - emission electric transit buses  Hired Joe Kerkhove as Senior Vice President, Strategic Markets to lead business development initiatives to expand the application of TPI’s advanced composite technologies to adjacent strategic markets such as transportation and aerospace

November 8 , 2017 2017 2018 2019 2020 2021 2022 2023 U.S. Turkey Mexico China 6 Existing Contracts Provide for ~ $ 4.4 Billion in Revenue through 2023 (1) Note: Our contracts with some of our customers are subject to termination or reduction on short notice, generally with substa nti al penalties, and contain liquidated damages provisions, which may require us to make unanticipated payments to our customers or our customers to make payments to us. (1) As of November 8, 2017. The chart depicts the term of the longest contract in each location. Includes revenue in 2017 for 7 manufacturing lines for GE that will not be extended beyond 2017 and revenue from the Proterra contract signed on November 8, 2017. Long - term supply agreements provide for estimated minimum aggregate volume commitments from our customers of approximately $2. 7 billion and encourage our customers to purchase additional volume up to, in the aggregate, an estimated total contract value of approximately $4.4 billion through the end of 2023 (1) Long - term Supply Agreements (1)

November 8 , 2017 7 Industry Update

November 8 , 2017 8 42.5 45.9 7.6 17.8 2016 2026E Developing wind markets Mature wind markets Onshore Global Market Growth Source: MAKE Q 2 2017 Global Wind Power Market Outlook Update Note: Developing wind markets defined as fewer than 6 GW of 2016 installed capacity Annual installed global wind capacity (GW): 2016 – 2026E Annual installed wind capacity growth is propelled by an increase in developing wind markets, including Turkey and Mexico where TPI Composites is well positioned to succeed 50.1 CAGR 0. 8 % CAGR 8.8% Mature wind market share Developing market s market share 15.2% 84.8% 2 7 . 9 % 7 2 . 1 % 6 3 . 7

November 8 , 2017 U.S. Onshore Market Growth: 2011 – 2020E The U.S. wind market is expected to experience consistent near - term growth in light of the PTC phase out Source: MAKE Q2 2017 Global Wind Power Market Outlook Update (GW) U.S. Onshore Wind Market Growth - Capacity (2011 – 2015) 6.2 12.5 1.1 4.8 8.6 0 3 6 9 12 15 2011 2012 2013 2014 2015 8.9 7.1 9.9 10.4 12.4 2016 2017E 2018E 2019E 2020E U.S. Onshore Wind Market Growth – Capacity (2016 – 2020E) Average annual installation: 9.7 GW Total U.S. wind installations: 48.7 GW Average annual installation: 6.6 GW Total U.S. wind installations: 33.2 GW 9

November 8 , 2017 Market Demand Drivers 10 • Overall competitiveness of wind energy • Corporate and industrial demand • Utilities being driven by consumer demand and sheer economics • Offshore economics • Repowering - globally • Decarbonization • Vehicle electrification • Energy access in developing and emerging economies

November 8 , 2017 11 Q 3 and Year to Date 2017 F inancial Highlights

November 8 , 2017 12 Q3 and Year to Date 2017 Financial Highlights (unaudited) (1) See pages 20 – 22 for reconciliations of non - GAAP financial data (2) Based on n et income attributable to common shareholders ($ in millions, except per share data and KPIs) Q3 ’17 Q3 ’16 ∆ YTD ’17 YTD ’16 ∆ Select Financial Data Net Sales $ 243.4 $ 198.9 22.3% $ 683.1 $ 569.3 20.0% Total Billings (1) $ 256.4 $ 196.1 30.8% $ 698.8 $ 566.8 23.3% Net Income $ 20.4 $ 2.8 629.3% $ 37.8 $ 16.1 134.8% Adjusted EBITDA (1) $ 30.1 $ 19.6 53.4% $ 76.4 $ 51.8 47.5% Adjusted EBITDA Margin 12.4% 9.9% 250 bps 11.2% 9.1% 210 bps Diluted Earnings per Share (2) $ 0.58 $ 0.08 $ 0.50 $ 1.09 $ 0.88 $ 0.21 Net Debt (1) $ (3.6) $ 7.1 $ 10.6 $ (3.6) $ 7.1 $ 10.6 Free Cash Flow (1) $ 9.0 $ 13.1 $ (4.1) $ 16.2 $ 9.1 $ 7.1 Capital Expenditures $ 8.6 $ 4.7 $ 3.9 $ 35.3 $ 18.9 $ 16.4 Key Performance Indicators (KPIs) Sets Invoiced 739     581     158     2,067     1,613     454     Estimated Megawatts 1,796     1,321     475     4,876     3,686     1,190     Dedicated Wind Blade Manufacturing Lines 48     38     10 lines 48     38     10 lines Wind Blade Manufacturing Lines Installed 38     32     6 lines 41     32     9 lines Wind Blade Manufacturing Lines in Startup 10     2     8 lines 12     2     10 lines Wind Blade Manufacturing Lines in Transition —     —     0 lines —     3     3 lines

November 8 , 2017 13 Income Statement Summary (unaudited) (1) See pages 20 - 22 for reconciliations of Non - GAAP financial data

November 8 , 2017 14 Key Balance Sheet and Cash Flow Data (unaudited) (1) See page 22 for a reconciliation of net debt and free cash flow September 30, December 31, ($ in thousands) 2017 2016 Balance Sheet Data: Cash and cash equivalents 139,065$ 119,066$ Restricted cash 3,802$ 2,259$ Accounts receivable 134,458$ 67,842$ Inventories 60,593$ 53,095$ Inventories held for customer orders 69,788$ 52,308$ Deferred revenue 87,294$ 69,568$ Total debt-current and noncurrent, net 133,637$ 123,155$ Net debt (1) (3,568)$ 6,379$ ($ in thousands) 2017 2016 2017 2016 Cash Flow Data: Net cash provided by operating activities 17,590$ 17,801$ 51,523$ 27,976$ Capital expenditures 8,585$ 4,673$ 35,312$ 18,917$ Free cash flow (1) 9,005$ 13,128$ 16,211$ 9,059$ Three Months Ended September 30, Nine Months Ended September 30,

November 8 , 2017 15 Guidance for 2017

November 8 , 2017 16 Guidance for 2017 (1) We have not reconciled our expected Total billings to expected net sales as calculated under GAAP because we have not yet fin ali zed calculations necessary to provide the reconciliation, including expected change in deferred revenue, and as such the reconciliation is not possible wit hou t unreasonable efforts . (2) References to “Lines” represents wind blade manufacturing lines. Previous Updated Total Billings (1) $9 30 M to $9 5 0M $9 45 M to $9 5 0M Adjusted EBITDA N/A $95M to $100M Sets 2,800 to 2,900 2,760 to 2,770 Average Selling Price per Blade $10 5 K to $110K $10 5 K to $110K Estimated Megawatts 6,350 to 6,600 6,510 to 6,540 Dedicated Lines at Year - end 2017 (2) 41 to 45 41 to 45 Total Lines Installed at Year - end 2017 (2) 37 41 Lines in Transition during the Year (2) 5 4 Lines in Startup during the Year (2) 15 15 Startup and Transition Costs $ 30 M to $ 40 M $40M Capital Expenditures $7 5 M to $85M $70M to $75M Effective Tax Rate 20% to 25% 20% Depreciation and Amortization $23M to $25M $20M Interest Expense $11M to $12M $12.5M Income Tax Expense $ 13 M to $ 15 M $10.5M to $11.5M Share - based Compensation $ 6 M to $ 7 M $7.2M

November 8 , 2017 17 Q&A

18

November 8 , 2017 19 Appendix - Non - GAAP Information This presentation includes unaudited non - GAAP financial measures including total billings, EBITDA, adjusted EBITDA, net debt and free cash flow . We define total billings as the total amounts we have invoiced our customers for products and services for which we are entitled to payment under the terms of our long - term supply agreements or other contractual agreements . We define EBITDA as net income (loss) attributable to the Company plus interest expense ( including losses on the extinguishment of debt and net of interest income ), income taxes, and depreciation and amortization . We define adjusted EBITDA as EBITDA plus any share - based compensation expense, plus or minus any gains or losses from foreign currency remeasurement . We define net debt as the total principal amount of debt outstanding less unrestricted cash and cash equivalents . We define free cash flow as net cash flow generated from operating activities less capital expenditures . We present non - GAAP measures when we believe that the additional information is useful and meaningful to investors . Non - GAAP financial measures do not have any standardized meaning and are therefore unlikely to be comparable to similar measures presented by other companies . The presentation of non - GAAP financial measures is not intended to be a substitute for, and should not be considered in isolation from, the financial measures reported in accordance with GAAP . See below for a reconciliation of certain non - GAAP financial measures to the comparable GAAP measures .

November 8 , 2017 20 Non - GAAP Reconciliations (unaudited) Note: Footnote references on the following page Net sales is reconciled to total billings as follows: Net income is reconciled to EBITDA and adjusted EBITDA as follows: ($ in thousands) 2017 2016 2017 2016 Net sales 243,354$ 198,938$ 683,142$ 569,303$ Change in deferred revenue: Blade-related deferred revenue at beginning of period (1) (74,255) (65,656) (69,568) (65,520) Blade-related deferred revenue at end of period (1) 87,294 61,949 87,294 61,949 Foreign exchange impact (2) 11 864 (2,035) 1,047 Change in deferred revenue 13,050 (2,843) 15,691 (2,524) Total billings 256,404$ 196,095$ 698,833$ 566,779$ Three Months Ended September 30, Nine Months Ended September 30, ($ in thousands) 2017 2016 2017 2016 Net income 20,398$ 2,797$ 37,801$ 16,098$ Adjustments: Depreciation and amortization 5,139 3,530 13,622 9,703 Interest expense (net of interest income) 3,206 4,636 9,137 12,633 Income tax provision 371 309 8,514 4,565 EBITDA 29,114 11,272 69,074 42,999 Share-based compensation expense 1,043 8,117 4,794 8,117 Realized loss (gain) on foreign currency remeasurement (39) 243 2,575 700 Adjusted EBITDA 30,118$ 19,632$ 76,443$ 51,816$ Three Months Ended September 30, Nine Months Ended September 30,

November 8 , 2017 21 Non - GAAP Reconciliations (continued) (unaudited) (1) Total billings is reconciled using the blade - related deferred revenue amounts at the beginning and the end of the period as follows : (2) Represents the effect of the difference in the exchange rate used by our various foreign subsidiaries on the invoice date ver sus the exchange rate used at the period - end balance sheet date. ($ in thousands) 2017 2016 2017 2016 Blade-related deferred revenue at beginning of period 74,255$ 65,656$ 69,568$ 65,520$ Non-blade related deferred revenue at beginning of period - - - - Total current and noncurrent deferred revenue at beginning of period 74,255$ 65,656$ 69,568$ 65,520$ Blade-related deferred revenue at end of period 87,294$ 61,949$ 87,294$ 61,949$ Non-blade related deferred revenue at end of period - - - - Total current and noncurrent deferred revenue at end of period 87,294$ 61,949$ 87,294$ 61,949$ Three Months Ended September 30, Nine Months Ended September 30,

November 8 , 2017 22 Non - GAAP Reconciliations (continued) (unaudited) Net debt is reconciled as follows: Free cash flow is reconciled as follows: September 30, December 31, September 30, ($ in thousands) 2017 2016 2016 Total debt, net of debt issuance costs 133,637$ 123,155$ 110,922$ Add debt issuance costs 1,860 2,290 2,947 Less cash and cash equivalents (139,065) (119,066) (106,802) Net debt (3,568)$ 6,379$ 7,067$ ($ in thousands) 2017 2016 2017 2016 Net cash provided by operating activities 17,590$ 17,801$ 51,523$ 27,976$ Less capital expenditures (8,585) (4,673) (35,312) (18,917) Free cash flow 9,005$ 13,128$ 16,211$ 9,059$ Nine Months Ended September 30, Three Months Ended September 30,

November 8 , 2017 23 Non - GAAP Reconciliations (continued) (unaudited) A reconciliation of the low end and high end of projected net income to projected EBITDA and projected adjusted EBITDA is as follows : ($ in thousands) Low End High End Projected net income 42,225$ 46,225$ Adjustments: Projected depreciation and amortization 20,000 20,000 Projected interest expense (net of interest income) 12,500 12,500 Projected income tax provision 10,500 11,500 Projected EBITDA 85,225 90,225 Projected share-based compensation expense 7,200 7,200 Projected realized loss on foreign currency remeasurement 2,575 2,575 Projected Adjusted EBITDA 95,000$ 100,000$ (1) All figures presented are projected estimates for the full year ending December 31, 2017. 2017 Adjusted EBITDA Guidance Range (1)

Exhibit 99.3

TPI Expands its Strategic Relationship with Proterra to Manufacture Composite Bus Bodies

SCOTTSDALE, Ariz., Nov. 08, 2017 (GLOBE NEWSWIRE) -- TPI Composites, Inc., (TPI) (Nasdaq:TPIC), announced today that it has entered into a new, five-year supply agreement with Proterra Inc. to be the supplier of composite bus bodies for Proterra’s Catalyst® zero-emission electric buses from its existing Rhode Island manufacturing facility and from a new U.S. manufacturing facility in Newton, Iowa that TPI expects to open in the first half of 2018.  Under this supply agreement TPI will provide capacity for up to 3,350 bus bodies over the five-year period. 

“We are excited to expand our relationship with Proterra and to support Proterra’s continued growth in the electric bus market as well as continue to demonstrate TPI’s deep advanced composite technology capabilities across multiple industry segments,” remarked Steve Lockard, TPI’s President and CEO.

The composite structure utilizes a combination of reinforcement materials including fiberglass and carbon fiber that enable a lightweight body structure that weighs thousands of pounds less than conventional metallic space frames. The lower mass composite body structure is one factor that enables Proterra to provide industry-leading range for its battery-electric vehicles.  Composite structures provide additional performance advantages with enhanced durability and reduced maintenance costs, by providing a corrosion-free solution.

“As cities and municipalities throughout North America transition to zero-emission buses, TPI’s expanded manufacturing footprint and advanced composites technology will help us to scale the production of our electric buses and cost-effectively serve our California and South Carolina factories in the United States,” said Ryan Popple, CEO of Proterra. 

About TPI Composites, Inc.

TPI Composites, Inc. is the only independent manufacturer of composite wind blades for the wind energy market with a global footprint and is an innovation leader for composite structures in the transportation market utilizing advanced composite technology and manufacturing expertise. TPI delivers high-quality, cost-effective composite solutions through long term relationships with leading global manufacturers. TPI is headquartered in Scottsdale, Arizona and operates factories throughout the U.S., China, Mexico, and Turkey.

Investor Contact:
investors@tpicomposites.com
480-315-8742

About Proterra

Proterra is a leader in the design and manufacture of zero-emission heavy-duty vehicles, enabling bus fleet operators to significantly reduce operating costs while delivering clean, quiet transportation to local communities across the United States. With more than 400 vehicles sold to 42 different municipal, university, airport and commercial transit agencies in 20 states, Proterra is committed to providing state of the art, high-performance vehicles to meet today’s growing market demand. The company’s configurable Catalyst platform is capable of serving the full daily mileage needs of nearly every U.S. transit route on a single charge. With unmatched durability and energy efficiency based on rigorous U.S. certification testing, Proterra products are proudly designed, engineered and manufactured in America, with offices in Silicon Valley, South Carolina, and Los Angeles. For more information, visit: http://www.proterra.com and follow us on Twitter @Proterra_Inc.

Media Contact :
pr@proterra.com