[2][3] It also was the operator of the Long Island Power Authority's electrical grid, which had previously been part of LILCO before LIPA took it over in 1998.

[4] In February 2006, National Grid USA, a wholly owned subsidiary of National Grid plc of the United Kingdom, announced that it had agreed to buy KeySpan for $7.3 billion (£4.1 billion) in cash, the deal being subject to regulatory approval and endorsement by the shareholders of the two companies.

[6] KeySpan received a 100% rating on the Corporate Equality Index released by the Human Rights Campaign starting in 2004, the third year of the report.

[7] Rapid growth in the early 1900s prompted the company to establish a new headquarters at 180 Remsen Street.

Noted Brooklyn architect Frank Freeman was commissioned to design the new headquarters, which was built in 1914.