A proposed rate hike by National Grid could go into effect this winter.

Massachusetts National Grid has proposed another increase that could see a current customer playing 21 percent more this winter than they are right now.

Though the rate hike this winter is lower than the one last winter, it still makes for pricier monthly bills for thousands of customers.

Why are residents seeing yet another rate hike? As president of National Grid in Massachusetts Marcy Reed says,

Due to continued gas pipeline constraints, the electric supply prices remain volatile and relatively high,"

Since National Grid simply delivers electricity to its 1.3 million Massachusetts customers and not generate it, they play no role in determining market prices.

The rate hike still needs to be approved by the Massachusetts Department of Public Utilities.