text_combined: enron update following announcement additional 1 billion credit line standard poor p today downgraded enron long term credit rating one notch bbb bbb short term rating 2 3 expected unusual downgraded using assets secure credit still investment grade ratings pipelines northern natural gas transwestern also lowered bbb p words ratings line parent company reflect p view enron pipeline assets become strategic company p also said continue believe enron liquidity position adequate see company current period uncertainty company working provide even greater liquidity cushion additional bank lines pending asset sales said building liquidity position additional credit lines maintains counterparties confidence strengthens core businesses important know gas power numbers account 95 percent trading activity indicate customer base withdrawing closing positions reducing transaction levels result credit concerns fact enrononline trading volumes currently experiencing normal activity continue update new developments arise thank