The study shows that publicly funded natural gas pipelines in New England are unnecessary, said the Boston-based Acadia Center, one of more than a dozen energy, environmental and consumer groups that served as advisers. “This study is matched by facts on the ground,” said Peter Shattuck, Acadia’s Massachusetts director. “Common sense market reforms, improvements in energy efficiency, and new clean energy supplies coming online are already addressing winter price volatility, making it clear that massive outlays for subsidized gas pipelines are an unnecessary risk for Massachusetts citizens to bear.”