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Reliant Energy HL&P of Houston built a pyramid-shaped reef 35 miles off the coast of Freeport, Texas, in the Gulf of Mexico, using blocks made from coal ash. The 6-year-old reef, consisting of 325, 64-cubic-foot blocks in 110 feet of water, has endured the corrosive effects of salt water and ocean currents and today attracts more than 50 species of fish to its corals, algae, and sponges, making it a popular sport fishing and recreational diving site. Photo shows a diver guiding the blocks into place during construction. Photo courtesy of Edison Electric Institute.

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