BEACH HAVEN TERRACE, N.J., July 10 — Tired of paying as much as $340 per month for gas and electricity at the Cape Cod home here where he has lived for 18 months, Michael Mercurio erected a 35-foot windmill in his backyard last fall that helped reduce his bill to about $114 — a year.

“It just makes sense,” said Mr. Mercurio, who is 61 and runs a company selling and installing windmills. “This is a clean, renewable source of energy.”

Some of his neighbors say it is also annoying. They say it is too big. They say it is too noisy. And some residents in this middle-class borough on Long Beach Island have gone to court to try to make him take it down, while the township has stilled it since winter.

It is a collision between the ideals of alternative energy and the suburban reality of New Jersey’s notorious not-in-my-backyard culture, casting Mr. Mercurio in the role of a latter-day environmental knight errant and his neighbor and principal adversary as the ecological equivalent of Cruella De Vil.