Berkshire Hathaway Specialty Insurance announced Tuesday that it is expanding its U.S. casualty underwriting capabilities to include pollution exposures and has named Chuck Hasselback to head its environmental group.

BHSI will provide an affirmative grant of pollution coverage on general casualty forms, which the company says is an important enhancement for energy and construction customers in particular. Coverage will be provided on a primary and excess basis, with available capacity of up to $25 million.

Meredith Bullock, vice president of casualty for BHSI, says that the addition of pollution coverage “reflects BHSI’s strategy of pairing our sound capacity with proven expertise to address market needs.”

Hasselback, BHSI’s assistant vice president of casualty environmental, was most recently product development manager for Lexington Insurance Co. He has more than 20 years of experience as an environmental consultant at various environmental remediation firms, as well as underwriting and management experience at AIG Environmental. He is based in BHSI’s Boston office.

BHSI has also recently announced expansions into Hong Kong and Singapore, as well as the addition of an asset management liability policy to enhance its Professional First suite of professional liability products.