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Preheat oven to 350°F.
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Butter and flour bundt pan making sure to get all the nooks and crannies.
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Whisk flour, baking powder, and salt in medium bowl.
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Using electric mixer, beat 1 2/3 cups sugar and butter in large bowl until light and fluffy.
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Beat in eggs, one at a time.
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Beat in orange peel and vanilla.
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Beat in dry ingredients in 3 additions alternately with buttermilk.
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Fold in blueberries.
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Pour batter into prepared pan. Bake for 1 hour or until toothpick instered in center of cake comes out clean.
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Cool cake in pan on rack 10 minutes.
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Turn cake out onto rack and cool completely.
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Transfer cake to plate, sift powdered sugar over, and serve.