Con Ed's Growth Plan Facing Big Obstacles
2d in NY Times series on problems confronting elec utilities in NYC area focuses on Con Ed; discusses opposition to Con Ed's expansion plans from environmentalists and critics who say that reduced elec demand resulting from energy crisis makes plans unnecessary; notes difficulties Con Ed faces in winning rate increases from PSC, in obtaining financing in bond mkt and even in collecting unpaid bills; describes customer complaints about utility's 'costly and wasteful' practices, particularly, preferential rates Con Ed gives to large users; map indicating Con Ed's generating stations (L)