http://www.legislation.gov.uk/wsi/2000/1163/contents/made
The Electricity Supply Industry (Rateable Values) (Wales) Order 2000
Electricity supply
Business rates
King's Printer of Acts of Parliament
2012-10-23
RATING AND VALUATION, WALES
Under paragraph 3(1) of Schedule 6 to the Local Government Finance Act 1988, the Secretary of State may by order provide that a hereditament of a description prescribed in the order is not to be valued for non-domestic rating on the basis set out in paragraphs 2 to 2C of that Schedule (that is to say, by reference to the rent a hypothetical tenant would pay for the hereditament on an annual basis), but on the basis of prescribed rules.
The Electricity Supply Industry (Rateable Values) (Wales) Order 2000
Gorchymyn y Diwydiant Cyflenwi Trydan (Gwerthoedd Ardrethol) (Cymru) 2000
Order
Utilities Act 2000