My contract with Ohm is ending in early Jan 2020, and I'm planning to change to Sembcorp's Sunshine Plan to 1) get the free AMI meter and 2) do my little bit to help the environment.
Should I sign up now, or wait till closer to the date? I haven't received any renewal offer from Ohm and anyway their renewal offer on the website is not very enticing.
		
		
	 
Actually, the renewal bonus is available on their promotion page which I have mentioned previously. Other than that, maybe you can wait for their CNY promo?
With regards to AMI meter, your old meter will be changed soon for free. SP is doing an island-wide change of old analogue meters to AMI. However, it will be by phases. SP don't mention the timeline, but it will be slowly changed out. 
How can the sunshine plan save the environment? Actually hor, if want to save the environment, use less electricity, don't on aircon. Pay lesser hence less natural gas/ coal needed to generate electricity.
For me, I renewed my ohm at the start of the year. Don't find the need to switch as there the differences is very minimal. No worth the effort to switch. Somemore, sembcorp uses separate billing, you need to arrange payment again.