UNITED STATES

SECURITIES AND EXCHANGE
COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

Item 5.

Interest in Securities of the Issuer

Item 5 is hereby amended as follows:

(a) OCM Principal Opportunities Fund II, L.P. (the “Principal Fund”) beneficially owns and has sole power to vote and dispose of 5,441,897 shares of the Issuer’s Common Stock (approximately 13.7% of the outstanding shares of the Issuer’s Common Stock), and OCM/GFI Power Opportunities Fund, L.P. (the “Power Fund” and, together with the Principal Fund, the “OCM Funds”) beneficially owns and has sole power to vote and dispose of 5,441,897 shares of the Issuer’s Common Stock (approximately 13.7% of the outstanding shares of the Issuer’s Common Stock).

As of the date of this Schedule 13D, Oaktree Capital Management, LLC (“Oaktree”), in its capacity as the general partner of the Principal Fund and the co-general partner of the Power Fund, may be deemed to beneficially own the 10,883,794 shares of Common Stock of the Issuer (approximately 27.3% of the outstanding shares of the Issuer’s Common Stock) held by the OCM Funds.  As of the date of this Schedule 13D, GFI Energy Ventures LLC (“GFI”), in its capacity as the co-general partner of the Power Fund, may be deemed to beneficially own the 5,441,897 shares of Common Stock of the Issuer (approximately 13.7% of the outstanding shares of the Issuer’s Common Stock) held by the Power Fund.

(b) Oaktree has discretionary authority and control over all of the assets of the Principal Fund pursuant to its status as general partner of the Principal Fund, including the power to vote and dispose of the Issuer’s Common Stock.  In addition, Oaktree has shared discretionary authority and control over all of the assets of the Power Fund pursuant to its status as co-general partner of the Power Fund, including shared power to vote and dispose of the Issuer’s Common Stock. Therefore, Oaktree has sole power to vote and dispose of 5,441,897 shares of the Issuer’s Common Stock and shared power to vote and dispose of 5,441,897 shares of the Issuer’s Common Stock.

GFI has shared discretionary authority and control over all of the assets of the Power Fund pursuant to its status as co-general partner of the Power Fund, including shared power to vote and dispose of the Issuer’s Common Stock. Therefore, GFI has shared power to vote and dispose of 5,441,897 shares of the Issuer’s Common Stock.

Oaktree, GFI and each of the individuals listed in Item 2 to this Schedule 13D disclaims beneficial ownership of the shares of the Issuer’s Common Stock held by the OCM Funds, and the filing of this Statement 13D shall not be construed as an admission that any such person is the beneficial owner of any such securities.

(c) On April 12, 2006, the Principal Fund sold 883,410 shares of Common Stock for $16.625 per share in a public offering registered under the Securities Act of 1933, as amended (the “Securities Act”). On April 12, 2006, the Power Fund sold 883,410 shares of Common Stock for $16.625 per share in a public offering registered under the Securities Act.  Both transactions were completed pursuant to the exercise of the Underwriters’ over-allotment option under the Underwriting Agreement referred to in Item 6 of Amendment No. 2 to this Statement on Schedule 13D.

On March 24, 2006, the Principal Fund sold 5,875,168 shares of Common Stock for $16.625 per share in a public offering registered under the Securities Act. On March 24, 2006, the Power Fund sold 5,875,168 shares of Common Stock for $16.625 per share in a public offering registered under the Securities Act.  Both transactions were completed pursuant to the Underwriting Agreement referred to in Item 6 of Amendment No. 2 to this Statement on Schedule 13D.

Item 7.

Material to Be Filed as Exhibits

Exhibit 1

A written agreement relating to the filing of the joint acquisition statement as required by Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended.

OAKTREE CAPITAL MANAGEMENT, LLC

/s/ Christopher Brothers

Name:

Christopher Brothers

Title:

Managing Director

/s/ Lisa Arakaki

Name:

Lisa Arakaki

Title:

Senior Vice President, Legal

GFI ENERGY VENTURES, LLC

/s/ Ian Schapiro

Name:

Ian Schapiro

Title:

Principal

OCM PRINCIPAL OPPORTUNITIES FUND II, L.P.

By:

Oaktree Capital Management, LLC,

its general partner

/s/ Christopher Brothers

Name:

Christopher Brothers

Title:

Managing Director

/s/ Lisa Arakaki

Name:

Lisa Arakaki

Title:

Senior Vice President, Legal

OCM/GFI POWER OPPORTUNITIES FUND, L.P.

By:

Oaktree Capital Management, LLC,

its co-general partner

/s/ Christopher Brothers

Name:

Christopher Brothers

Title:

Managing Director

/s/ Lisa Arakaki

Name:

Lisa Arakaki

Title:

Senior Vice President, Legal

Exhibit 1

A written agreement relating to the filing of the joint acquisition statement as required by Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended.