ADN/PNA by Eric Lidji.  The Regulatory Commission of Alaska is letting four owners of the trans-Alaska oil pipeline keep charging higher shipping rates on oil bound for Alaska markets while it continues investigating whether the rate increases are reasonable. CBC.  Bob McLeod (NGP Photo) said if the blowout — which has led to a massive oil spill off the coast of Louisiana — leads to tighter U.S. environmental restrictions on oil production, there could be more demand for natural gas from places like the N.W.T.'s Mackenzie Delta, where a gas pipeline has [...]