UPDATE1-KKR could go to NYSE or Nasdaq - document

* Consent documents sent to KPE unitholders

* Solicitation period ends August 14

* US listing could be on either NYSE or Euronext

* Dollar General valued at $1.6 bln at end March (Recasts with details on listing, adds details on NYSE/Nasdaq exchanges, portfolio valuations, bylines, New York dateline)

By Megan Davies and Jessica Hall

NEW YORK/PHILADELPHIA, July 24 (Reuters) - Private equity giant Kohlberg Kravis Roberts & Co could spark feisty competition between the Nasdaq (NDAQ.O) and the New York Stock Exchange (NYX.N) if it goes forward with plans to list in the U.S.

According to a document sent to unitholders of its Amsterdam-listed fund on Friday, it is considering listing on either exchange.

KKR has been trying for two years to follow rival Blackstone Group (BX.N) in becoming a listed company, and had previously announced -- then withdrawn -- plans to list on the NYSE.

It most recently announced plans to buy its Euronext listed fund KKR Private Equity Investors LP KKR.AS (KPE), a move that gives it a European listing, and leaves the door open to it becoming a U.S. traded company.

KKR said in the document on Friday that following the deal to buy KPE, both KKR and KPE would have the right to cause the combined company to list on on either the NYSE or the Nasdaq.

For an exchange, winning a new IPO or gaining a listing gives it bragging rights that help market it as a destination exchange. Winning the listing of KKR, one of the largest and most influential private equity firms in the world, would be a coup.

Listings are also lucrative, accounting for between 15 to 20 pct of overall revenues at the two parent companies of the exchanges. The NYSE and Nasdaq were not immediately available for comment.

KKR has been expected to list on the NYSE, so choosing Nasdaq would be a surprise. A source familiar with the situation, however, said KKR would be more likely to list on the NYSE.

If it listed in the U.S., the document said KPE would make an in-kind distribution of its interests in the combined company to KPE unitholders, and KPE would be delisted from Euronext, the document said.

The details were included in a consent solicitation sent on Friday, seeking approval of KPE unitholders to proceed with the planned combination.

Under the consent solicitation, if the majority of the unitholders provide valid consent prior to the August 14 expiry date, KPE may then move ahead with the proposed plan. Those owning 44 percent of KPE's outstanding shares have already agreed to the deal.

Provided that consent is obtained from unitholders, the deal is expected to occur on October 1. The record date for determining which KPE unitholders were entitled to consent to the transaction was July 23.

INVESTMENT DATA

The documents also gave details of the value of KKR's investments in various portfolio companies.

It said that as of March 31, investments which represented greater than 5 percent of the net assets of its consolidated private equity funds included Dollar General, valued at $1.6 billion.

KKR wrote up the value of its investment in Dollar General in March, compared with December, and there has been speculation about whether it will seek an initial public offering for the discount store.

The others valuations it listed for March 31 are: First Data valued at $1.5 billion, Alliance Boots valued at $1.4 billion, Legrand S.A valued at $1.4 billion, HCA Inc. valued at $1.1 billion. Biomet valued at $1 billion, Energy Future Holdings valued at $1 billion and Legg Mason (LM.N) valued at $988.5 million. (Additional reporting by Jonathan Spicer in New York)