63.—(1) The Board may after consultation with an authorised undertaker make contracts for the execution of works for or on behalf of such authorised undertaker, and the Board may after consultation with an authorised undertaker prepare plans, maps, and specifications in relation to any works to be executed by such authorised undertaker and supervise the execution of such works.

(2) The Board may by agreement with an authorised undertaker make contracts for the sale of electricity by such authorised undertaker and may by agreement with an authorised undertaker, and if so requested by such authorised undertaker, shall supervise the making of contracts for the sale of electricity by and on behalf of such authorised undertaker and the execution of contracts so made.

(3) For the purpose of effecting economy in the execution of any works (including the supply of materials therefor) the subject of a contract made by the Board for and on behalf of any authorised undertaker or in the construction of works (including the supply of materials therefor) being or to be supervised by the Board under this section the Board may form or cause to be formed such a combination of authorised undertakers as the Board may consider necessary or expedient.

(4) An authorised undertaker shall not incur any expenditure in respect of the construction, reconstruction, extension, equipment, or re-equipment of any works used by such authorised undertaker as part of or in connection with his undertaking save in accordance with such plans and specifications as are approved for the purpose by the Board.

(5) Whenever any such expenditure as is mentioned in the foregoing sub-section is incurred by an authorised undertaker after the passing of this Act and the construction, reconstruction, extension, equipment, or re-equipment in respect of which such expenditure is so incurred is executed on plans or specifications which have not been approved by the Board or otherwise than in accordance with plans and specifications so approved and the undertaking of such authorised undertaker is acquired by the Board under this Act, such expenditure or such amount thereof as remains undischarged at the date of such acquisition shall not, without the consent of the Board, be taken over by the Board as a liability of such undertaking.