The fixed rate plan costs about 6.59 cents per kilowatt-hour of electricity in Westchester, about a penny and a half less than the company's similar plan in Manhattan, Mr. Sorenson said.
Some expenses have a fixed rate, like costs for mailing regular shipments to a long-term client, while others, like utilities, will vary from week to week or monthly.
Due to Microsoft's royalty structure, vendors pay the company for handsets based on a percentage of manufacturing costs rather than a fixed rate.
Figures from the Bank show that for a borrower with a 25% deposit, the average cost of a five-year fixed rate mortgage has plummeted since 2009.
Boulger says the best two-year fixed rate they would get would be over 20 years, costing £1,020 a month.
For consumers looking for the certainty offered by a fixed rate the lowest is currently offered by OVO Energy, whose New Energy Fixed tariff costs £1,088, fixed for 12 months.
Convert it into a fixed rate.
(Its lowest fixed rate is at 6.49percentt).
Mark Todd, the co-founder of price comparison site energyhelpline, said 3 million customers a year are ditching expensive standard tariffs and moving to lower-cost fixed rates, and 1.5 million a year are leaving the big six and moving to smaller suppliers.
"We engage in long-term contracts, and for a certain period we pay a premium [to fossil-fuel-generated electricity], but it doesn't take that long for the traditional-energy cost to surpass our fixed-rate cost" and help Dell save money.
"I favour fixed rates for first-time buyers simply because they protect them from additional cost at a time when money can be at its tightest.
