It cost a little bit more this week than last to stay warm in Maine.

The cost of heating oil edged up two cents over the past seven days, according to the weekly home energy price survey conducted by the Maine State Planning Office.

The statewide average on Monday was $1.91 per gallon, up two pennies from a week earlier and 51 cents a gallon more than the commodity cost last year at this time.

Kerosene also rose by two cents per gallon over the week. That fuel now averages $2.19 per gallon in Maine, the SPO survey found.

The average is 57 cents more than people paid a year ago for kerosene.

Propane’s price was unchanged over the week, holding at $2.03 per gallon when purchased in bulk for heating applications. That’s up 34 cents from last year.

The increases in oil and kerosene mirror a climb in the price of crude oil. As of Friday, a barrel of crude edged up to $46.31 in New York Mercantile Exchange trading.

The SPO said the price increase for crude could be linked to several factors, including increased demand from the onset of colder weather in the Northeast.

Other factors were new concerns about oil supplies after the release of a new Osama bin Laden tape that called on insurgents to attack Middle East oil facilities, and plans by OPEC members to cut back production slightly.