The Kansas Corporation Commission won't grant additional time for Westar Energy Inc. and Great Plains Energy Inc. to revise a merger proposal for the two entities to become one. The companies, along with Kansas City Power & Light, were seeking additional time to draft a proposal that would satisfy the KCC's merger standards following the rejection of the $12.2 billion merger in April. Tuesday's decision means Westar (NYSE:WR) and Great Plains (NYSE:GXP) would have to start from scratch if...