EXHIBIT 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, each of the persons named below agrees to the joint filing of a Statement on Schedule 13D (including amendments thereto) with respect to the Ordinary Shares, par value US $0.0001 per share, of Solarfun Power Holdings Co., Ltd., and further agrees that this Joint Filing Agreement be included as an exhibit to such filings, provided that, as contemplated by Section 13d-1(k)(ii), no person shall be responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate. This Joint Filing Agreement may be executed in any number of counterparts, all of which together shall constitute one and the same instrument.

Dated: December 28, 2007

GOOD ENERGIES II LP acting by its General Partner GOOD ENERGIES GENERAL PARTNER JERSEY LIMITED
by:	/s/ Fintan Kennedy		/s/ John Hammill
	Name:	Fintan Kennedy	John Hammill
	Title:	Director	Director
COFRA JERSEY LIMITED
by:	/s/ Fintan Kennedy		/s/ John Hammill
	Name:	Fintan Kennedy	John Hammill
	Title:	Director	Director
GOOD ENERGIES INC
by:	/s/ Michelle S. Riley
	Name:	Michelle S. Riley
	Title:	Director, Vice President and Secretary
GOOD ENERGIES (UK) LLP acting by its managing member GOOD ENERGIES INVESTMENTS LIMITED
by:	/s/ Andrew Lee		/s/ Wayne Woo
	Name:	Andrew Lee	Wayne Woo
	Title:	Director	Director
GOOD ENERGIES AG
by:	/s/ Marcel Brenninkmeijer
	Name:	Marcel Brenninkmeijer
	Title:	Director
GOOD ENERGIES INVESTMENTS (JERSEY) LIMITED
by:	/s/ Fintan Kennedy		/s/ John Hammill
	Name:	Fintan Kennedy	John Hammill
	Title:	Director	Director
COFRA HOLDING AG
by:	/s/ Andrew Vellani		/s/ Rob Smeele
	Name:	Andrew Vellani	Rob Smeele
	Title:	Director	Authorized Signatory

FIDARC SARL
by:	/s / Michel de Groote		/s/ Raf Bogaerts
	Name:	Michel de Groote	Raf Bogaerts
	Title:	Manager	Manger
GOOD ENERGIES HOLDINGS LIMITED
by:	/s/ A.B.S. Garden
	Name:	A.B.S. Garden
	Title:	Director
THE BANBURY SETTLEMENT THROUGH FIRCROFT LIMITED AS TRUSTEE
by:	/s/ Louise Adams
	Name:	Louise Adams
	Title:	Director