Altira Group is an early stage venture capital firm focused on energy technology. Through five energy technology funds and years of experience, Altira has demonstrated its commitment to the energy industry as well as its ability to understand and adapt to the changing energy landscape. Altira's investment professionals have extensive backgrounds in both technical and business development aspects of energy technology. They have developed a sound investment program built on our background in energy, a hands-on approach, and a strong dedication to our mission. The Altira mission is to invest in innovative technology companies that will impact the future of energy. They are active, lead investors who help build successful energy technology companies. www.altiragroup.com

Craton Equity Partners is Southern California’s leading clean tech fund focused entirely on bringing technologies that mitigate the effects of climate change and environmental degradation to market. Their investments range from green building products to earth heat exchangers and next generation biofuels. www.cratonep.com 

Goldman Sachs Group is a leading global investment banking, securities and investment management firm which provides a wide range of services worldwide to a substantial and diversified client base, which includes corporations, financial institutions, governments and high net worth individuals. Founded in 1869, it is one of the oldest and largest investment banking firms. The firm is headquartered in New York and maintains offices in London, Frankfurt, Tokyo, Hong Kong and other major financial centers around the world. www.goldmansachs.com

New Enterprise Associates (NEA) is a leading venture capital firm focused on helping entrepreneurs create and build major new enterprises that use technology to improve the way we live, work and play. Since its founding in 1978, the firm has followed the same core principles: supporting its entrepreneurs, providing an excellent return to its limited partners and practicing its profession with the highest standards and respect. NEA focuses on investments at all stages of a company’s development, from seed-stage through IPO. With approximately $8.5 billion in committed capital, NEA’s experienced management team has invested in over 550 companies, of which more than 160 have gone public and more than 230 have been acquired. www.nea.com

Launched in June 2006, Perella Weinberg Partners is an independent, privately-owned financial services firm that provides corporate advisory and asset management services to clients around the world. Today, in its London and New York offices, the firm comprises 23 partners and over 95 employees recruited from a wide variety of leading financial institutions. Perella Weinberg Partners raised $1.1 billion from a global group of investors to establish the operations of the firm and to fund its asset management initiatives. www.pwpartners.com

The Quercus Trust, a privately held family trust, is a prominent investor in the alternative energy sector, with investments in both privately held and publicly traded companies.

Robeco, established in Rotterdam in 1929, offers investment products and services to institutional and private investors worldwide. It has EUR 142 billion in assets under management (at 31 December 2006). The product range encompasses equity and fixed-income investments, money-market and real-estate funds and alternative investments, such as private equity, hedge funds and structured products. Robeco is part of Rabobank Group, one of the few retail banks with the highest credit ratings from Moody’s and Standard & Poor’s. www.robeco.com

The Susquehanna International Group of Companies (SIG) is one of the largest privately held global financial firms servicing major securities markets and institutional clients worldwide. An innovator with options and derivatives, SIG leverages its quantitative applications to maintain its renowned liquidity provision and execution capabilities in a broad range of equity, fixed income, and commodity products. SIG includes affiliated entities specializing in investment banking, research, institutional sales and trading, private equity and venture capital. Headquartered in the Philadelphia area, SIG employs more than 1,400 individuals located in Asia, Australia, Europe, and North America. www.sig.com