ElectricRates

Massachusetts · National Grid Nantucket

National Grid (Nantucket Electric) electricity rate history

Every approved residential rate revision for National Grid (Nantucket Electric), drawn from the NREL Utility Rate Database. Use this page to read where today's rate sits in the historical picture — and to time a supplier switch with that context.

Last updated:

Quick answer

How much has National Grid Nantucket’s rate changed since I last shopped? The chart below shows every approved residential rate revision for National Grid (Nantucket Electric) on file with the URDB. Scroll to compare today’s rate against the same month in any prior year — the gap is what a non-shopping customer has absorbed.

How much has National Grid Nantucket’s rate gone up since I last shopped?

Nantucket Electric (a National Grid subsidiary) serves Nantucket Island under a separate tariff from National Grid mainland. The revisions below trace each approved residential Basic Service change for island customers.

Rate increases compound. A 10% step-up isn’t paid once — it’s the floor under every kWh you’ll buy until the next reset. Three of those in a decade is the difference between a household that pays attention at contract renewal and one that doesn’t. That’s the case for keeping a per-utility historical view honest and in one place.

Tap or hover any point to see the exact effective date, revision name, and rate. Toggle to table view for the full chronological list with fixed monthly charges.

How to read this history if you're shopping for a better rate

Nantucket's island-specific cost structure shows up in the rate history — and while the same Energy Switch MA marketplace is available to island residents, the comparison math is unique to this territory.

Three useful comparisons

  • Today vs. five years ago. Look at the most recent revision in the chart against the one effective ~5 years before. That's the compounded shift — the lift a non-shopping customer absorbed.
  • Today vs. recent low. The lowest rate in the past three years is the rough floor a competitive supplier could have offered at the time. If today's rate is well above that floor, a fixed-rate offer locked in at the low would still be saving its customer money right now.
  • Step size of changes. Are revisions small and frequent, or large and rare? Large step-ups are the moments where switching ahead of the change pays the most — and they show up clearly in the chart as steep stair-treads.

Methodology & sources

Revisions on this page come from the U.S. Utility Rate Database (URDB) , maintained by the National Renewable Energy Laboratory (NREL). URDB aggregates approved residential, commercial, and industrial tariff filings — the same documents utilities file with their state public utility commissions.

We filter to National Grid Nantucket's residential default service (the rate non-shopping customers pay), sorted by effective date, and show every approved revision back to the earliest URDB record for the utility. The "source" link on each revision in the table points to the original tariff filing PDF on the utility or commission website.

Refresh cadence: URDB updates daily as new tariff filings are approved. We re-sync monthly and update this page on the next deploy. The "last updated" date at the top of the page reflects the most recent sync.

Service territory: Nantucket Island, Massachusetts.

URDB is public-domain federal data (NREL / U.S. Department of Energy). Attribution is courtesy, not required — we cite it because the source matters.

Keep going

Other Massachusetts utility rate histories

Side-by-side, the Massachusetts histories tell you how each utility's customers have fared.

Source: National Renewable Energy Laboratory (NREL) — U.S. Utility Rate Database (openei.org/wiki/Utility_Rate_Database). Public-domain federal data. Each revision row links to the original tariff filing on the utility or commission website. Last synced from URDB: 2026-06-18.