Companhia Paranaense de Energia : Reduction of Participation

COMPANHIA PARANAENSE DE ENERGIA - COPEL Corporate Taxpayer's ID (CNPJ/MF): 76.483.817/0001-20

Publicly Held Company

CVM Registration: 1431-1

SEC Registration (CUSIP) 20441B407 - Class B Preferred Shares

SEC Registration (CUSIP) 20441B308 - Common Shares LATIBEX Registration 29922 - Class B Preferred Shares

NOTICE TO THE MARKET

Companhia Paranaense de Energia - COPEL, a company that generates, transmits, distributes and sells power, with shares listed on the BM&FBOVESPA (CPLE3, CPLE5, CPLE6), NYSE (ELPVY, ELP) and LATIBEX (XCOP), in compliance with Article 12 of CVM Instruction 358/02, hereby informs its shareholders and the market in general that it has received a correspondence from Wellington Management Group LLP (transcribed below) stating, on behalf of some of its clients and in its capacity as an investment manager, the information that reduced its participation, in aggregate form, to 6,340,628 class B preferred shares (CPLE6) representing approximately 4.94% of all the total preferred shares issued by COPEL.

Curitiba, January 15, 2018

Adriano Rudek de Moura

Chief Financial and Investor Relations Officer

WELLINGTON MANAGEMENT GROUP LLP

280 Congress Street. Boston, Massachusetts 02210 USA

T +1 617.951.5000| F +1 617.95l.5000| F +1 617.951.5000 Client Servicewww.weIlihgton.com

15th January 2018

Companhia Paranaense de Energia Attn.: Mariceli Schmidt dos Santos Investor Relations

Email:[e-mail]

Rua Coronel Dulcídio, 800 - Batel CEP: 80420-170

Curitiba - Paraná

Ref: Decrease of significant ownership interest in Companhia Paranaense de Energia Dear Sir /Madam,

Wellington Management Group LLP ("Wellington Management"), a limited liability partnership validly existing under the laws of the Commonwealth of Massachusetts, USA, headquartered at 280 Congress Street, Boston, Massachusetts, 02210, USA, in its capacity as the ultimate parent company to a series of companies that exercise investment management activities with clients outside of Brazil (the "Wellington Entities") and on their behalf, in compliance with Article 12 of the CVM Instruction No. 358, dated January 3, 2002, as amended ("CVM Instruction 358"), hereby informs that the portfolios of clients under the Wellington Entities' management (the "Accounts") have sold, through certain transactions on stocl< exchanges, certain shares issued by Companhia Paranaense de Energia ("Company"), thus holding currently 6,174,100 preferred shares, representing 4.81% of all preferred shares issued by the Company (on the basis of a total number of outstanding preferred shares 128,295,668), and 166,528 ADRs, representing 0.13% (on the basis of a total number of outstanding preferred shares 128,295,668).

Wellington Management also informs that the Wellington Entities have proxy voting rights on behalf of certain Accounts, in connection with the discretionary management powers.

This is a minority investment that does not involve a change in the composition of corporate control or a change in the management structure of the Company. Currently, the Wellington Entities do not intend to purchase for the Accounts any additional shares of the Company with the intent to acquire control or to change the management structure of the Company.

Please do not hesitate to contact us should you need any further clarifications. For any matters relating to this letter, please contact Taisia Lowe at [phone].

For purposes of Article 119 of Law 6,404, of December 15, 1976, as amended, the representative(s) in Brazil of the Accounts are listed below:

AMERICANSHIP + CO CACTUSMARSH + CO DEEPANCHOR CO FINWELL & CO IRISHSAIL CO

LONGREEF + CO MEXICANBLANKET + CO

THE HARTFORD INTERNATIONAL VALUE FUND USAA INTERNATIONAL FUND

ARCADE & CO.

ARKANSAS TEACHER RETIREMENT SYSTEM BANK OF NEW YORK MELLON

Deutsche Bank S.A. - Banco Alemão DOMINION RESOURCES, INC. MASTER TRUST EMPLOYEES' RETIREMENT SYSTEM OF THE ST OF HI FINWELL + CO

FMAP WMC LIMITED

GENERAL PENSION AND SOCIAL SECUHTY AUTHORITY GLOBAL OPPORTUNITIES FUND LIMITED

HARTFORD LONG/SHORT GLOBAL EQUIT HEWLETT-PACKARD COMPANY MASTER TRUST HIGHLAND COLLECTIVE INVESTMENT TRU HIGHLAND PUBLIC INFLATION HEDGES F HP INVEST COMMON CONTRACTUAL FUND ITALIANCOAL + CO.

JPM SP(DTVM),]PMCB NA FBO ALL OTHER Lockheed Martin Corporation Master Retirement Trust MEXICANDOLPHIN & CO.

MULTI-ADVISOR FUNDS INTERNATIONAL EQUITY VALUE FUND NEBRASKA PUBLIC EMPLOYEES RETIREMENT SYSTEMS

Salt River Pima-Maricopa Indian Community

SQUIDISLAND + CO

TELUS PENSIONS MASTER TRUST

THE WELLINGTON TRUST COMPANY NATIONAL ASSOCIATION MULTIPLE COLLECTIVE INVESTMENT FUNDS TRUST

THE WELLINGTON TRUST COMPANY, NATIONAL ASSOCIATION MULTIPLE COMMON TRUST FUNDS TRUST GLOBAL PERSPECTIVES PORTFOLIO

WELLINGTON GLOBAL PERSPECTIVES FUND (CANADA) WELLINGTON MANAGEMENT FUNDS (IRELAND) PLC

WELLINGTON MANAGEMENT FUNDS (LUXEMBOURG) - WELLINGTON GLOBAL CAPITAL CYCLES LONG-SHORT FUND D30

WELLINGTON TRUST COMPANY N.A.

WILMINGTON MULTI-MANAGER ALTERNATIVES FUND

WORKPLACE HEALTH, SAFETY AND COMPENSATION COMMISSION OF NEW BRUNSWICK

Kind regards,

Wellington Management Group LLP

____________________________

James Wilson

Authorized Person