Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F6,F7,F8,F9}	Nov 18, 2015	P$0	862,645	—	A	8,940,015	I	Footnotes
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F6,F7,F8}	Nov 18, 2015	P$0	762,681	—	A	7,871,035	I	Footnotes
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F6}	Nov 18, 2015	P$0	618,990	—	A	6,334,442	I	Footnotes
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F6}	Nov 18, 2015	P$0	618,990	—	A	6,334,442	D
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F6}	Nov 18, 2015	P$0	61,902	—	A	661,963	I	Footnotes
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F6}	Nov 18, 2015	P$0	61,902	—	A	661,963	D
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F7}	Nov 18, 2015	P$0	23,460	—	A	250,873	I	Footnotes
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F7}	Nov 18, 2015	P$0	23,460	—	A	250,873	D
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F7}	Nov 18, 2015	P$0	41,461	—	A	443,376	I	Footnotes
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F7}	Nov 18, 2015	P$0	41,461	—	A	443,376	D
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F8}	Nov 18, 2015	P$0	68,119	—	A	728,437	I	Footnotes
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F8}	Nov 18, 2015	P$0	68,119	—	A	728,437	D
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F8}	Nov 18, 2015	P$0	16,868	—	A	180,381	I	Footnotes
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F8}	Nov 18, 2015	P$0	16,868	—	A	180,381	D
Class A Common Stock^{F1,F2,F3,F4,F5,F10,F9}	Nov 18, 2015	P$0	31,845	—	A	340,543	D

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1The filing of this Form 4 shall not be construed as an admission that any of BlueMountain Capital Management, LLC ("BMCM"), GP Holdings (as defined in Footnote 5) or the General Partners (as defined in Footnote 5) is or was for the purposes of Section 16(a) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise the beneficial owner of any of the shares of Class A Common Stock, par value $0.01 per share (the "Common Stock"), of Terraform Power, Inc. (the "Issuer"). Pursuant to Rule 16a-1(a)(4) of the Exchange Act, each of BMCM, GP Holdings and the General Partners disclaims such beneficial ownership, except to the extent of its respective pecuniary interest.
F10The Reporting Persons are jointly filing this Form 4 pursuant to Rule 16(a)-3(j) under the Exchange Act. The Form 4 for certain additional Reporting Persons is being filed separately and simultaneously with this Form 4 due to the limitation of ten Reporting Persons per filing.
F2BMCM is the investment manager of each of: (i) Blue Mountain Credit Alternatives Master Fund L.P. ("BMCA"), which is the direct beneficial owner of 6,334,442 shares of Common Stock; (ii) BlueMountain Foinaven Master Fund L.P. ("BMFV"), which is the direct beneficial owner of 661,963 shares of Common Stock; (iii) BlueMountain Guadalupe Peak Fund L.P. ("BMGP"), which is the direct beneficial owner of 250,873 shares of Common Stock; (iv) BlueMountain Logan Opportunities Master Fund L.P. ("BMLO"), which is the direct beneficial owner of 443,376 shares of Common Stock; (v) BlueMountain Montenvers Fund SCA SICAV-SIF ("BMM"), which is the direct beneficial owner of 728,437 shares of Common Stock; (vi) BlueMountain Kicking Horse Fund L.P. ("BMKH" and, together with BMCA, BMFV, BMGP and BMLO, the "Partnerships"), which is the direct beneficial owner of 180,381 shares of Common Stock; and
F3(vii) BlueMountain Timberline Ltd. ("BMT" and, together with the Partnerships and BMM, the "Funds"), which is the direct beneficial owner of 340,543 shares of Common Stock. BMCM, although it directs the voting and disposition of the Common Stock held by the Funds, only receives an asset-based fee relating to the Common Stock held by the Funds.
F4(i) Blue Mountain CA Master Fund GP, Ltd. ("BMCA GP") is the general partner of BMCA and has an indirect profits interest in the Common Stock beneficially owned by it; (ii) BlueMountain Foinaven GP, LLC ("BMFV GP") is the general partner of BMFV and has an indirect profits interest in the Common Stock beneficially owned by it; (iii) BlueMountain Long/Short Credit GP, LLC ("BMGP GP") is the general partner of BMGP and has an indirect profits interest in the Common Stock beneficially owned by it; (iv) BlueMountain Montenvers GP S.a r.l. ("BMM GP") is the general partner of BMM and has an indirect profits interest in the Common Stock beneficially owned by it; (v) BlueMountain Logan Opportunities GP, LLC ("BMLO GP") is the general partner of BMLO and has an indirect profits interest in the Common Stock beneficially owned by it; and
F5(vi) BlueMountain Kicking Horse Fund GP, LLC ("BMKH GP" and, together with BMCA GP, BMFV GP, BMGP GP and BMLO GP, the "General Partners") is the general partner of BMKH and has an indirect profits interest in the Common Stock beneficially owned by it. BlueMountain GP Holdings, LLC ("GP Holdings") is the sole owner of each of the General Partners and thus has an indirect profits interest in the Common Stock beneficially owned by the Partnerships. BMCM is the sole owner of BMM GP and thus has an indirect profits interest in the Common Stock beneficially owned by BMM.
F6On November 18, 2015: (i) BMCA acquired 7,095 shares of Common Stock at a price per share of $9.86, 141,914 shares of Common Stock at a price per share of $9.17, 177,390 shares of Common Stock at a price per share of $9.58, 23,712 shares of Common Stock at a price per share of $9.50, 228,296 shares of Common Stock at a price per share of $8.97, 27,086 shares of Common Stock at a price per share of $9.96 and 13,497 shares of Common Stock at a price per share of $10.02; (ii) BMFV acquired 738 shares of Common Stock at a price per share of $9.86, 14,757 shares of Common Stock at a price per share of $9.17, 18,447 shares of Common Stock at a price per share of $9.58, 23,740 shares of Common Stock at a price per share of $8.97, 2,816 shares of Common Stock at a price per share of $9.96 and 1,404 shares of Common Stock at a price per share of $10.02;
F7(iii) BMGP acquired 280 shares of Common Stock at a price per share of $9.86, 5,593 shares of Common Stock at a price per share of $9.17, 6,991 shares of Common Stock at a price per share of $9.58, 8,996 shares of Common Stock at a price per share of $8.97, 1,068 shares of Common Stock at a price per share of $9.96 and 532 shares of Common Stock at a price per share of $10.02; (iv) BMLO acquired 494 shares of Common Stock at a price per share of $9.86, 9,884 shares of Common Stock at a price per share of $9.17, 12,356 shares of Common Stock at a price per share of $9.58, 15,900 shares of Common Stock at a price per share of $8.97, 1,887 shares of Common Stock at a price per share of $9.96 and 940 shares of Common Stock at a price per share of $10.02;
F8(v) BMM acquired 812 shares of Common Stock at a price per share of $9.86, 16,240 shares of Common Stock at a price per share of $9.17, 20,299 shares of Common Stock at a price per share of $9.58, 26,124 shares of Common Stock at a price per share of $8.97, 3,099 shares of Common Stock at a price per share of $9.96 and 1,545 shares of Common Stock at a price per share of $10.02; (vi) BMKH acquired 201 shares of Common Stock at a price per share of $9.86, 4,021 shares of Common Stock at a price per share of $9.17, 5,027 shares of Common Stock at a price per share of $9.58, 6,469 shares of Common Stock at a price per share of $8.97, 767 shares of Common Stock at a price per share of $9.96 and 383 shares of Common Stock at a price per share of $10.02; and
F9(vii) BMT acquired 380 shares of Common Stock at a price per share of $9.86, 7,591 shares of Common Stock at a price per share of $9.17, 9,490 shares of Common Stock at a price per share of $9.58, 12,213 shares of Common Stock at a price per share of $8.97, 1,449 shares of Common Stock at a price per share of $9.96 and 722 shares of Common Stock at a price per share of $10.02.