Supplier offers "Price Protection Tariff" w/o exit fees, and more expensive Variable Price tariff. Does that mean it is betting on the price falling?
It is possible that the supplier is trying to segment the market:


For those customers who do not frequently review the pricing options, it has a "standard variable tariff" which is not the lowest price on the market
For those customers of theirs or of other suppliers who do review the options, it has a lower price option which it sets competitively, though it hopes that some of these will not review at the end of the 12 month period and will then be automatically switched to the higher price "standard variable tariff" 


Whether you regard this as promoting competition or as an abuse in competitive markets is a complicated political and regulatory question