HOUSTON — The oil spill in the Gulf of Mexico adds a sense of urgency to the quest for clean, renewable energy sources, but economic, technical, and regulatory obstacles exist, experts told The Bond Buyer’s conference on Financing Sustainable Energy and Efficiency yesterday.

“Investment opportunities in non-hydro sustainable sources represents an investment opportunity of $400 billion,” said Gary Krellenstein, managing director at JPMorgan. “But developing the technology to store and dispatch power will be the key to reduce dependence and investor risk on subsidies and regulatory mandates.”

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