Avista : Report of unscheduled material events or corporate event

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): December 17, 2018

AVISTA CORPORATION

(Exact name of registrant as specified in its charter)

Washington

1-3701

91-0462470

(State of other jurisdiction of incorporation)

(Commission file number)

(I.R.S. Employer Identification No.)

1411 East Mission Avenue, Spokane, Washington

(Address of principal executive offices)

99202-2600 (Zip Code)

Registrant's telephone number, including area code:

509-489-0500

Web site:http://www.avistacorp.com

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

• [ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

• [ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

• [ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

• [ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Section 8 - Other Events

Item 8.01 Other Events.

On December 17, 2018, Avista Corporation (Avista Corp.) and Hydro One Limited (Hydro One) filed a petition requesting that the Washington Utilities and Transportation Commission (WUTC) reconsider its December 5, 2018 order denying approval of Hydro One's acquisition of Avista Corp., together with a petition requesting that the UTC rehear the matter to accept new evidence.

Under Washington State law, the WUTC has 20 days to act on the petition for reconsideration. If the WUTC grants the petition for reconsideration, it could modify its prior order or take any actions it deems appropriate, including extending the timeframe for its deliberations, or it could affirm its prior order. A copy of a press release announcing the filing of the petition is filed as Exhibit 99.1.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(d) 99.1

Exhibits

Press release dated December 17, 2018.

Neither the filing of any press release as an exhibit to this Current Report nor the inclusion in such press release of a reference to Avista Corp.'s Internet address shall, under any circumstances, be deemed to incorporate the information available at such Internet address into this Current Report. The information available at Avista Corp.'s Internet address is not part of this Current Report or any other report furnished or filed by Avista Corp. with the Securities and Exchange Commission.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

AVISTA CORPORATION

(Registrant)

Date:December 18, 2018

/s/Mark T. Thies Mark T. Thies

Senior Vice President,

Chief Financial Officer, and Treasurer

Exhibit 99.1

Press Release

Hydro One and Avista file request to reconsider decision in Washington merger case

TORONTO and SPOKANE, WA, Dec. 17, 2018 - As announced on December 10, 2018, Hydro One Limited ("Hydro One") (TSX: H) and Avista Corporation ("Avista") (NYSE: AVA) today filed a petition requesting that the Washington Utilities and Transportation Commission ("UTC") reconsider its December 5, 2018 order denying approval of Hydro One's acquisition of Avista, together with a petition requesting that the UTC rehear the matter to accept new evidence.

Under Washington law, the UTC has 20 days to act on the petition for reconsideration. If the UTC grants the petition for reconsideration, it may modify its prior order or take any actions it deems appropriate, including extending the timeframe for its deliberations.

A copy of the filing can be found athttps://www.utc.wa.gov/_layouts/15/CasesPublicWebsite/CaseItem.aspx? item=document&id=00167&year=2017&docketNumber=170970&resultSource=&page=1&query=170970&refiners=&isModal=false&omItem=false&doItem=false.

For further information:

Hydro One

Media:

Jay Armitage

Director, Corporate [e-mail], 416-345-6868

Investors:

Omar Javed

Vice President, Investor [e-mail], 416-345-5943

Avista

Media:

Casey Fielder, Communications [e-mail], 509-495-4916

Investors:

Jason Lang, Director of [e-mail], 509-495-2930

About Hydro One Limited

We are Ontario's largest electricity transmission and distribution provider with more than 1.3 million valued customers, over C$25 billion in assets and 2017 annual revenues of nearly C$6 billion. Our team of over 7,400 skilled and dedicated regular and non-regular employees proudly and safely serves suburban, rural

and remote communities across Ontario through our 30,000 circuit km of high-voltage transmission and 123,000 circuit km of primary distribution networks. Hydro One is committed to the communities we serve, and has been rated as the top utility in Canada for its corporate citizenship, sustainability, and diversity initiatives. We are one of only six utility companies in Canada to achieve the Sustainable Electricity Company designation from the Canadian Electricity Association. We also provide advanced broadband telecommunications services on a wholesale basis utilizing our extensive fibre optic network. Hydro One Limited's common shares are listed on the Toronto Stock Exchange (TSX: H).

Forward-Looking Statements and Information

This press release and the filing to which it refers may contain "forward-looking information" within the meaning of applicable securities laws. Words such as "expect", "anticipate", "intend", "attempt", "may", "plan", "will", "can", "believe", "seek", "estimate", and variations of such words and similar expressions are intended to identify such forward-looking information. These statements are not guarantees of future performance or actions and involve assumptions and risks and uncertainties that are difficult to predict. Therefore, actual outcomes and results may differ materially from what is expressed, implied or forecasted in such forward-looking information. Some of the factors that could cause actual results or outcomes to differ materially from the results expressed, implied or forecasted by such forward-looking information, including some of the assumptions used in making such statements, are discussed more fully in Hydro One's filings with the securities regulatory authorities in Canada, which are available on SEDAR atwww.sedar.com. Hydro One does not intend, and it disclaims any obligation, to update any forward-looking information, except as required by law.

About Avista Corporation

Avista Corporation is an energy company involved in the production, transmission and distribution of energy as well as other energy-related businesses. Avista Utilities is our operating division that provides electric service to 383,000 customers and natural gas to 348,000 customers. Its service territory covers 30,000 square miles in eastern Washington, northern Idaho and parts of southern and eastern Oregon, with a population of 1.6 million. Alaska Energy and Resources Company is an Avista subsidiary that provides retail electric service in the city and borough of Juneau, Alaska, through its subsidiary Alaska Electric Light and Power Company. Avista stock is traded under the ticker symbol "AVA." For more information about Avista, please visitwww.myAvista.com.

This news release contains forward-looking statements regarding the company's current expectations. Forward-looking statements are all statements other than historical facts. Such statements speak only as of the date of the news release and are subject to a variety of risks and uncertainties, many of which are beyond the company's control, which could cause actual results to differ materially from the expectations. These risks and uncertainties include, in addition to those discussed herein, all of the factors discussed in the company's Annual Report on Form 10-K for the year ended Dec. 31, 2017 and the Quarterly Report on Form 10-Q for the quarter ended Sept. 30, 2018.