Another emerging feature in RPS is to set aside a certain portion of the RPS for specific resources. This fosters development of a wider range of resources, some of which might otherwise be uneconomical. In particular, set-asides for solar power - which is among the most expensive form of renewable energy - are becoming more popular. The BPU's new regulations include a 2% solar set-aside, which is forecast to require 1500 MW of solar power installations.
The BPU's decision follows a challenge by newly-elected governor Jon Corzine to create a new energy policy, as well as extensive studies on the feasibility and benefits of adopting a 20% RPS. In support of its decision, the BPU cited a raft of benefits expected from renewable energy, including fuel diversity, price stability, clean air and reduced greenhouse gas emission that cause global warming.