From the April 2008 update to plaNYC, Progress Report 2008: A Greener, Greater New York, chapter on energy, numbered page 26/PDF page 28:

New Yorkers face rising energy costs and carbon emissions from an ineffective wholesale electricity energy market, aging infrastructure, inefficient buildings, and growing energy needs. Every year, New Yorkers collectively spend approximately $13.4 billion on the energy that powers our lights and electronic devices and on fuel for heating and hot water. Our buildings’ energy use is by far the largest contributor in the city to climate change, contributing approximately 80% of our citywide greenhouse gas emissions. And it is growing ... Transmission constraints, rising construction costs, and regulatory uncertainty make it difficult to plan adequately for this growing demand. At this rate, our electricity demand will exceed available supply by 2012, leaving New Yorkers dependent on a constrained and inefficient power system that pushes energy costs and emissions even higher.