National Grid - SEMA price to compare and competitive offers

How National Grid - SEMA’s supply rate compares with the offers on the Energy Switch Massachusetts rate board, what has been moving, what is driving it, and what is scheduled to change.

Price to compare
17.18¢/ kWh
National Grid - SEMA default service, since August 1, 2026
Lowest offer
15.10¢/ kWh
CleanChoice Energy, 12-month fixed
Current offers
40
from 19 suppliers on the Energy Switch Massachusetts rate board
Checked
Oct 52026
7:21 AM Eastern, daily snapshot
Official rateboard ↗
Right now

Every current offer against the price to compare

Each dot is one offer on the Energy Switch Massachusetts rate board, placed by contract length and price. Offers below the dashed line cost less than default service today.

Current offers by contract length, against National Grid - SEMA’s price to compare

40 offers from 19 suppliers · Energy Switch Massachusetts · October 5, 2026

14¢15¢16¢17¢18¢19¢20¢21¢6 mo8912141518242636Contract length, monthsNational Grid - SEMA price to compare17.18¢15.10¢ CleanChoice Energy, 12 moCurrent offerLowest offerNational Grid - SEMA price to compare
GRID SHOPPER2 offers above 21¢ omitted for scale
How it got here

The lowest offer, the typical 12-month offer, and the supply rate over time

Daily snapshots of the Energy Switch Massachusetts rate board. The supply rate moves a few times a year; offers move whenever suppliers reprice.

Lowest offer, average 12-month offer, and National Grid - SEMA price to compare, April to October 2026

Daily rateboard snapshots · price to compare from default service filings

11¢12¢13¢14¢15¢16¢17¢18¢19¢MayJunJulAugSepOctAug 1 resetAvg 12-mo offer17.03¢National Grid - SEMA price to compare17.18¢Lowest offer15.10¢
GRID SHOPPERLowest offer is the cheapest of any term on that day
View the data
DateLowest offerAvg 12-mo offer
2026-04-0511.97¢17.18¢
2026-04-0611.97¢17.18¢
2026-04-0711.89¢17.33¢
2026-04-0811.97¢17.40¢
2026-04-0911.97¢17.40¢
2026-04-1011.79¢17.38¢
2026-04-1111.97¢17.40¢
2026-04-1211.97¢17.40¢
2026-04-1311.97¢17.40¢
2026-04-1411.89¢17.40¢
2026-04-1511.89¢17.40¢
2026-04-1611.89¢17.36¢
2026-04-1711.89¢17.30¢
2026-04-1811.89¢17.30¢
2026-04-1911.89¢17.30¢
2026-04-2011.89¢17.30¢
2026-04-2111.89¢17.26¢
2026-04-2211.89¢17.26¢
2026-04-2311.89¢17.26¢
2026-04-2411.89¢17.20¢
2026-04-2511.89¢17.20¢
2026-04-2611.89¢17.20¢
2026-04-2711.89¢17.20¢
2026-04-2811.89¢17.13¢
2026-04-2912.19¢17.13¢
2026-04-3012.19¢17.13¢
2026-05-0112.40¢17.16¢
2026-05-0212.40¢17.16¢
2026-05-0312.40¢17.16¢
2026-05-0412.40¢17.16¢
2026-05-0512.40¢17.09¢
2026-05-0612.40¢17.09¢
2026-05-0712.39¢17.35¢
2026-05-0812.99¢17.36¢
2026-05-0912.99¢17.36¢
2026-05-1012.99¢17.36¢
2026-05-1112.99¢17.36¢
2026-05-1212.99¢17.55¢
2026-05-1312.99¢17.55¢
2026-05-1412.99¢17.55¢
2026-05-1512.99¢17.55¢
2026-05-1612.99¢17.55¢
2026-05-1712.99¢17.55¢
2026-05-1812.99¢17.55¢
2026-05-1912.99¢17.62¢
2026-05-2012.99¢17.73¢
2026-05-2113.09¢17.85¢
2026-05-2213.09¢17.74¢
2026-05-2313.09¢17.74¢
2026-05-2413.09¢17.74¢
2026-05-2513.09¢17.74¢
2026-05-2613.09¢17.74¢
2026-05-2712.89¢17.72¢
2026-05-2812.89¢17.72¢
2026-05-2912.89¢17.72¢
2026-05-3012.89¢17.72¢
2026-05-3112.89¢17.72¢
2026-06-0112.89¢17.57¢
2026-06-0212.89¢17.57¢
2026-06-0312.89¢17.62¢
2026-06-0412.89¢17.62¢
2026-06-0512.99¢17.64¢
2026-06-0612.99¢17.64¢
2026-06-0712.99¢17.64¢
2026-06-0812.99¢17.64¢
2026-06-0912.99¢17.66¢
2026-06-1012.99¢17.66¢
2026-06-1112.99¢17.66¢
2026-06-1212.99¢17.66¢
2026-06-1313.29¢17.66¢
2026-06-1413.29¢17.66¢
2026-06-1513.29¢17.66¢
2026-06-1613.29¢17.66¢
2026-06-1713.49¢17.62¢
2026-06-1813.49¢17.62¢
2026-06-1913.49¢17.66¢
2026-06-2013.49¢17.66¢
2026-06-2113.49¢17.66¢
2026-06-2213.49¢17.66¢
2026-06-2313.49¢17.66¢
2026-06-2413.49¢17.66¢
2026-06-2513.49¢17.66¢
2026-06-2613.49¢17.66¢
2026-06-2713.49¢17.66¢
2026-06-2813.49¢17.66¢
2026-06-2913.49¢17.66¢
2026-06-3013.49¢17.68¢
2026-07-0113.49¢17.52¢
2026-07-0213.49¢17.52¢
2026-07-0313.49¢17.52¢
2026-07-0413.49¢17.52¢
2026-07-0513.49¢17.52¢
2026-07-0613.49¢17.52¢
2026-07-0713.49¢17.56¢
2026-07-0813.49¢17.34¢
2026-07-0913.89¢17.36¢
2026-07-1013.89¢17.40¢
2026-07-1113.89¢17.44¢
2026-07-1213.89¢17.44¢
2026-07-1313.89¢17.44¢
2026-07-1413.89¢17.46¢
2026-07-1513.89¢17.46¢
2026-07-1613.89¢17.42¢
2026-07-1715.20¢17.49¢
2026-07-1815.20¢17.49¢
2026-07-1915.20¢17.47¢
2026-07-2015.20¢17.47¢
2026-07-2115.20¢17.57¢
2026-07-2215.20¢17.57¢
2026-07-2315.20¢17.61¢
2026-07-2415.20¢17.63¢
2026-07-2515.20¢17.68¢
2026-07-2615.20¢17.68¢
2026-07-2715.20¢17.68¢
2026-07-2815.20¢17.61¢
2026-07-2915.20¢17.61¢
2026-07-3015.20¢17.61¢
2026-07-3115.20¢17.61¢
2026-08-0115.00¢17.57¢
2026-08-0215.00¢17.57¢
2026-08-0315.00¢17.57¢
2026-08-0415.20¢17.75¢
2026-08-0515.20¢17.79¢
2026-08-0615.20¢17.79¢
2026-08-0715.20¢17.71¢
2026-08-0815.20¢17.71¢
2026-08-0915.20¢17.71¢
2026-08-1015.20¢17.71¢
2026-08-1115.20¢17.69¢
2026-08-1215.20¢17.69¢
2026-08-1315.20¢17.69¢
2026-08-1415.20¢17.69¢
2026-08-1515.20¢17.69¢
2026-08-1615.20¢17.69¢
2026-08-1715.20¢17.69¢
2026-08-1815.20¢17.71¢
2026-08-1915.20¢17.71¢
2026-08-2015.20¢17.71¢
2026-08-2115.20¢17.71¢
2026-08-2215.20¢17.72¢
2026-08-2315.20¢17.72¢
2026-08-2415.20¢17.72¢
2026-08-2515.20¢17.85¢
2026-08-2615.20¢17.88¢
2026-08-2715.80¢17.92¢
2026-08-2815.80¢17.71¢
2026-08-2915.80¢17.71¢
2026-08-3015.80¢17.71¢
2026-08-3115.80¢17.71¢
2026-09-0115.80¢17.71¢
2026-09-0216.00¢17.69¢
2026-09-0315.70¢17.70¢
2026-09-0415.70¢17.70¢
2026-09-0515.70¢17.70¢
2026-09-0615.70¢17.70¢
2026-09-0715.70¢17.70¢
2026-09-0815.70¢17.70¢
2026-09-0915.70¢17.67¢
2026-09-1015.70¢17.67¢
2026-09-1115.80¢17.68¢
2026-09-1215.80¢17.72¢
2026-09-1315.80¢17.72¢
2026-09-1415.80¢17.72¢
2026-09-1515.80¢17.80¢
2026-09-1615.80¢17.82¢
2026-09-1716.10¢17.84¢
2026-09-1816.10¢17.84¢
2026-09-1916.10¢17.84¢
2026-09-2016.10¢17.84¢
2026-09-2116.10¢17.84¢
2026-09-2216.10¢17.81¢
2026-09-2316.10¢17.81¢
2026-09-2415.60¢17.71¢
2026-09-2515.60¢17.71¢
2026-09-2615.60¢17.71¢
2026-09-2715.60¢17.71¢
2026-09-2815.60¢17.71¢
2026-09-2915.60¢17.68¢
2026-09-3015.59¢17.63¢
2026-10-0115.10¢17.51¢
2026-10-0215.10¢17.03¢
2026-10-0315.10¢17.03¢
2026-10-0415.10¢17.03¢
2026-10-0515.10¢17.03¢

One supplier's offers by contract length

August to October 2026

Pick a supplier from the menu to see how each of its contract lengths has been priced, day by day, against the supply rate.
GRID SHOPPER

Share of National Grid - SEMA residential customers with a competitive supplier

National Grid - SEMA monthly filings · January 2021 to August 2026, the latest available

45%50%55%60%65%70%75%20212022202320242025202672.7%281,499 of 0.39M
GRID SHOPPERUtilities report customer counts several months after the fact
View the data
MonthWith a supplierTotal residentialShare
2021-01176,294374,24247.1%
2021-02175,496374,85346.8%
2021-03179,016375,70147.6%
2021-04184,138375,96649.0%
2021-05183,206376,12148.7%
2021-06181,478375,95348.3%
2021-07179,792375,79447.8%
2021-08177,972375,71747.4%
2021-09176,165375,51746.9%
2021-10174,643375,61346.5%
2021-11174,859375,98146.5%
2021-12182,246376,21348.4%
2022-01181,089376,57148.1%
2022-02180,269376,79547.8%
2022-03183,460376,84348.7%
2022-04182,000377,03848.3%
2022-05180,469377,07147.9%
2022-06180,291377,03847.8%
2022-07178,805376,88747.4%
2022-08177,001376,74647.0%
2022-09174,897377,02846.4%
2022-10173,530377,49546.0%
2022-11172,586378,09945.6%
2022-12180,401378,50347.7%
2023-01188,699378,88849.8%
2023-02190,692379,22950.3%
2023-03204,638379,47353.9%
2023-04206,547379,42354.4%
2023-05213,841379,59056.3%
2023-06212,358379,50456.0%
2023-07211,277379,66655.6%
2023-08210,121379,72655.3%
2023-09209,105380,11155.0%
2023-10211,340380,54555.5%
2023-11210,411380,80155.3%
2023-12209,944381,05455.1%
2024-01209,445381,66354.9%
2024-02209,715381,99154.9%
2024-03214,041382,56555.9%
2024-04213,798382,80955.8%
2024-05223,257383,07658.3%
2024-06244,395383,17563.8%
2024-07242,333383,60763.2%
2024-08239,862383,81262.5%
2024-09241,854384,22762.9%
2024-10242,388384,95763.0%
2024-11241,187385,40262.6%
2024-12254,374385,76865.9%
2025-01252,710386,21165.4%
2025-02251,706386,49065.1%
2025-03254,211386,58265.8%
2025-04256,382386,57266.3%
2025-05258,822386,41367.0%
2025-06259,706386,43367.2%
2025-07260,682386,31267.5%
2025-08258,510386,13066.9%
2025-09258,086386,16366.8%
2025-10275,880386,51871.4%
2025-11274,650386,67971.0%
2025-12282,420386,97573.0%
2026-01279,753387,55872.2%
2026-02279,023387,73072.0%
2026-03284,407387,77273.3%
2026-04285,582387,71973.7%
2026-05283,060387,49873.0%
2026-06284,094387,26173.4%
2026-07281,024387,03872.6%
2026-08281,499387,42372.7%
What is driving it

How National Grid - SEMA buys default service supply, and at what price

National Grid - SEMA buys the power behind the price to compare in auctions held ahead of each service period; the latest reaches up to 16 months ahead. The price to compare is the average of what those auctions locked in.

Share of each month’s supply already bought, by auction, and the average price locked in

June 2024 to July 2027 · National Grid - SEMA default service procurement results, residential

$60$70$80$90$100$110$120$130$1400%25%50%75%100%$122.16/MWhtodaynot yet boughtJun 2024Jan 2025Jan 2026Jan 2027Avg price bought, $/MWh (left)Share of each month's supply bought, by auction (right axis)Sep 2023Dec 2023Jun 2024Dec 2024Jun 2025Dec 2025Apr 2026
GRID SHOPPERAuctions stack oldest at the bottom · striped area is supply not yet bought
View the data
Service monthBoughtAvg price ($/MWh)
June 2024100%91.07
July 2024100%91.07
August 2024100%119.00
September 2024100%119.00
October 2024100%119.00
November 2024100%119.00
December 2024100%119.00
January 2025100%119.00
February 2025100%105.25
March 2025100%105.25
April 2025100%105.25
May 2025100%105.25
June 2025100%105.25
July 2025100%105.25
August 2025100%113.58
September 2025100%113.58
October 2025100%113.58
November 2025100%113.58
December 2025100%113.58
January 2026100%113.58
February 2026100%111.84
March 2026100%111.84
April 2026100%111.84
May 2026100%111.84
June 2026100%111.84
July 2026100%111.84
August 2026100%128.65
September 2026100%128.65
October 2026100%128.65
November 2026100%128.65
December 2026100%128.65
January 2027100%128.65
February 202750%122.16
March 202750%122.16
April 202750%122.16
May 202750%122.16
June 202750%122.16
July 202750%122.16
What is scheduled

The dates that change these numbers

How far ahead National Grid - SEMA’s supply has been bought. Forecasts and opinions live on the blog.

Supply bought through
July 2027
The April 2026 auction covers service through July 2027
Sources
Offers from the Energy Switch Massachusetts rate board, snapshotted daily. Price to compare and auction results from National Grid - SEMA default service filings. Customer counts from National Grid - SEMA’s monthly filings. Checked October 5, 2026.
Methodology and data sources Machine-readable version of this page (Markdown) Developer API