The UK’s National Grid is the power transmission company of the United Kingdom.
It carries a lot of debt to fund its operations.
The current outstanding debt is £23.0 billion (2017: £19.3 billion).
The interest payments on the debt (statutory net finance costs) were £745 million.
The effective interest rate on Treasury managed debt for the year was 4.6%
However, one has to note, that cash generated from continuing operations was £4,702 million, (£4.7 Billion)
http://www.shareshop.hsbc.co.uk/shareshop/security.cgi?csi=51261
A yield of 5%