JOINT FILING AGREEMENT
Exhibit 1
Each of the undersigned hereby agrees that this statement on Schedule 13D is being filed with the Securities and Exchange Commission on behalf of each of the undersigned pursuant to Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended.
Dated: June 5, 2013
| TOTAL S.A. | ||
| By: | /s/ Xxxxxxx xx Xxxxxx | |
| Name: Xxxxxxx xx Xxxxxx | ||
| Title: Treasurer | ||
| TOTAL ENERGIES NOUVELLES ACTIVITÉS USA | ||
| By: | /s/ Xxxxxxx Xxxxxxx | |
| Name: Xxxxxxx Xxxxxxx | ||
| Title: President | ||
