14/7/2021 · Choosing The Best OEM Retailer And Plan For Your Household. And if you prefer to lock in the fixed rate for the long-term, consider Union Power’s Union Saver 24, which gives the best deal at 19.57 cents/kWh for a 24-month contract.The best rate for the mid-term (12-months) is 19.55 cents/kWh, from Union Power’s Union Saver 12 and Sembcorp