A Souvenir NSP Coffee Mug commemorating 85 Years of Service. The Northern States Power Company is now part of Excel Energy and when you google NSP not much comes up anymore. This mug is Blue and stands 4 inches tall. The front has a raised portion with "85 Years of Service, NSP and 1909-1994. The mug is in very nice condition and appears to have never been used. The bottom has a piece of cork, built in coaster.