Transmission issues and federal policy are the greatest barriers to the development of wind energy in the US, according to a poll conducted by NRG Systems at this year's American Wind Energy Association annual conference. More than 400 participated in the survey. Of those, 37% believe transmission or interconnection issues pose the greatest barrier. Another 34% see US policy as the biggest hurdle. Financing issues, supply chain constraints and public attitudes toward wind energy are of much less concern. The poll found 47% of respondents believe the US holds the greatest promise for future wind energy development. China was second with 37%. Nearly all of those asked expect their company sales to increase in the next year, but 32% believe the competition for skilled labour poses the greatest barrier to that growth. The expiration of wind's production tax credit and supply chain constraints are viewed as lesser obstacles to growth, polling 28% and 23%, respectively. NRG Systems conducted the instant poll during a pre-conference seminar on June 1 and among diners at the Women of Wind Energy luncheon on June 3.