The minute books are all signed. There are five directors' minute books covering 1911-1948 (BEL 1). They record the proceedings of the meetings of the company's board of directors. The early books concentrate on the financial and share aspects of the company while the later volumes offer more detail on the company's power generation and supply activities.
There is also a signed shareholders' minute book covering 1904-1948 (BEL 2). They contain minutes of meetings to which shareholders were invited along with accompanying copies of accounts and notices of meetings.