The Public Utilities Regulatory Commission, which sets and reviews the tariffs charged by ECG for electricity and by Ghana Water for water.
Tariffs are reviewed quarterly, which is why any published per-kWh figure should be treated as an order of magnitude rather than a quotation, and why this site attaches an expiry date to the one it publishes.
The PURC also handles consumer complaints against the utilities — a route most people do not know exists.