Singapore power - Has the power to tax?

Tax according to Wiki: http://en.wikipedia.org/wiki/Tax

Singapore Power is a private entity.
Is it legitimate to impose a 30% water borne tax on every household (Read your water bill)
A tax "is not a voluntary payment or donation, but an enforced contribution, exacted pursuant to legislative authority" and is "any contribution imposed by government. Failure to pay is punishable by law.

1,000,000 households water bill @ average $20/mth

$6(30%) x 1,000,000 = 6m per month

Comments and corrections welcomed.

There's no such thing as a "private entity" in Sinkieland.

Good point! Should send to PMO and ask them!

It's not called Singapore POWER for nothing. It can do anything it likes.

http://investing.businessweek.com/research/stocks/private/board.asp?privcapId=686415