Eversource and National Grid, like all other deregulated utilities, remain the provider of last resort and will supply your energy if you do not choose another option. As customers join or leave their supply service, Eversource and National Grid will mix long and short termed purchases to balance their system. The result of these purchases are then passed on to the customer as the ‘Price To Compare’. This PTC will change multiple times per year as new purchases are made or drop off. Boston Buying Power is able to use the energy futures market to find low trading dips and purchase long term contracts which lower customer prices.