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|View History:  Monthly  Annual Download Data (XLS File)                                         
|View History:  Monthly  Annual                                                                   
|View History:  Monthly  Annual                                                                   
|View History:                                                                                    
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|Percent of Commercial Natural Gas Deliveries in Massachusetts Represented by the Price  (Percent)
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|Percent of Commercial Natural Gas Deliveries in Massachusetts Represented by the Price  (Percent)
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|Year                                                                                                                              | Jan   | Feb   | Mar   | Apr   | May   | Jun   | Jul   | Aug  | Sep  | Oct  | Nov  | Dec 
|--------------------------------------------------------------------------------------------------------------------------------- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ---- | ---- | ---- | ---- | ----
|1989                                                                                                                              | 99.9  | 99.9  | 99.9  | 99.9  | 99.9  | 99.9  | 99.9  | 99.9 | 99.9 | 99.9 | 99.9 | 99.9
|                                                                                                                                 
|1990                                                                                                                              | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 99.8 | 99.8 | 99.8 | 99.7 | 99.7
|1991                                                                                                                              | 99.8  | 99.8  | 99.9  | 99.9  | 99.9  | 99.8  | 99.7  | 99.6 | 99.6 | 99.8 | 99.9 | 99.9
|1992                                                                                                                              | 99.9  | 99.9  | 99.8  | 99.8  | 99.7  | 99.8  | 99.7  | 99.6 | 99.6 | 99.6 | 99.7 | 99.8
|1993                                                                                                                              | 98.9  | 98.7  | 98.5  | 97.7  | 96.5  | 97.7  | 96.8  | 89.2 | 97.5 | 96.7 | 96.9 | 97.8
|1994                                                                                                                              | 75.2  | 78.4  | 72.5  | 69.8  | 69.8  | 61.2  | 67.0  | 86.0 | 79.7 | 90.6 | 81.2 | 87.1
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|1995                                                                                                                              | 87.9  | 89.4  | 92.0  | 88.3  | 88.0  | 82.7  | 74.6  | 77.3 | 77.5 | 81.0 | 81.6 | 79.5
|1996                                                                                                                              | 84.7  | 83.5  | 82.4  | 80.2  | 79.2  | 71.3  | 68.1  | 61.3 | 55.4 | 69.5 | 62.5 | 68.9
|1997                                                                                                                              | 68.0  | 69.0  | 72.9  | 74.1  | 69.9  | 48.5  | 46.0  | 41.3 | 43.8 | 48.7 | 62.9 | 68.6
|1998                                                                                                                              | 60.9  | 58.7  | 61.0  | 56.2  | 48.9  | 42.2  | 46.4  | 49.6 | 80.7 | 45.1 | 57.8 | 82.1
|1999                                                                                                                              | 71.8  | 76.8  | 58.7  | 38.0  | 43.5  | 34.2  | 60.8  | 66.2 | 70.3 | 71.4 | 70.3 | 74.6
|                                                                                                                                 
|2000                                                                                                                              | 73.7  | 69.5  | 60.0  | 57.6  | 55.9  | 50.8  | 51.1  | 51.2 | 67.6 | 58.3 | 61.4 | 67.9
|2001                                                                                                                              | 72.9  | 68.5  | 68.2  | 64.7  | 55.5  | 52.5  | 56.2  | 52.3 | 51.8 | 48.8 | 58.9 | 51.3
|2002                                                                                                                              | 63.5  | 59.4  | 68.4  | 57.4  | 52.2  | 41.8  | 51.9  | 49.1 | 41.0 | 44.6 | 62.0 | 65.4
|2003                                                                                                                              | 69.2  | 75.0  | 70.1  | 70.0  | 62.3  | 59.8  | 56.0  | 48.6 | 45.6 | 60.9 | 81.2 | 73.0
|2004                                                                                                                              | 76.6  | 74.8  | 74.6  | 70.7  | 63.1  | 59.1  | 67.1  | 60.8 | 64.0 | 69.0 | 70.4 | 72.9
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|2005                                                                                                                              | 75.4  | 76.6  | 75.5  | 68.1  | 64.3  | 63.4  | 60.0  | 54.9 | 58.4 | 64.4 | 69.3 | 73.3
|2006                                                                                                                              | 77.0  | 73.3  | 73.7  | 67.8  | 70.5  | 66.5  | 62.0  | 66.8 | 67.3 | 64.9 | 67.8 | 67.5
|2007                                                                                                                              | 68.4  | 66.7  | 69.2  | 64.3  | 65.5  | 50.2  | 63.4  | 55.4 | 56.0 | 59.0 | 62.2 | 71.2
|2008                                                                                                                              | 61.6  | 56.8  | 65.1  | 52.4  | 49.9  | 49.4  | 54.4  | 51.0 | 52.0 | 55.7 | 59.1 | 60.7
|2009                                                                                                                              | 62.7  | 56.4  | 62.7  | 51.3  | 45.9  | 47.3  | 48.9  | 50.3 | 50.6 | 54.8 | 54.6 | 61.1
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|2010                                                                                                                              | 59.0  | 54.9  | 59.8  | 47.5  | 44.5  | 45.1  | 45.1  | 46.7 | 49.3 | 52.9 | 49.0 | 50.3
|2011                                                                                                                              | 54.5  | 52.5  | 49.7  | 44.6  | 53.1  | 48.4  | 40.0  | 43.0 | 42.8 | 45.5 | 50.0 | 51.5
|2012                                                                                                                              | 55.8  | 49.5  | 52.1  | 43.1  | 44.7  | 42.6  | 44.7  | 42.4 | 42.1 | 42.1 | 48.2 | 50.4
|2013                                                                                                                              | 42.8  | 41.2  | 41.7  | 39.5  | 32.8  | 27.7  | 29.5  | 28.9 | 29.7 | 37.2 | 37.2 | 47.4
|2014                                                                                                                              | 49.5  | 45.1  | 49.8  | 43.9  | 36.9  | 29.9  | 30.6  | 23.9 | 28.7 | 32.3 | 36.0 | 47.4
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|2015                                                                                                                              | 54.2  | 52.4  | 56.0  | 46.3  | 36.7  | 34.2  | 28.2  | 26.7 | 26.4 | 32.3 | 37.9 | 44.3
|2016                                                                                                                              | 53.2  | 54.8  | 54.7  | 48.9  | 42.0  | 33.3  | 31.8  | 27.8 | 28.5 | 36.4 | 44.2 | 51.8
|2017                                                                                                                              | 52.4  | 50.4  | 52.5  | 47.6  | 39.3  | 34.9  | 29.8  | 29.1 | 28.1 | 35.2 | 45.4 | 53.2
|2018                                                                                                                              | 55.6  | 51.6  | 51.8  | 48.3  | 42.3  | 34.0  | 29.3  | 27.5 | 28.3 | 32.0 | 39.4 | 47.7
|2019                                                                                                                              | 41.5  | 40.4  | 43.7  | 42.5  | 34.5  | 31.5  | 26.0  | 27.5 | 22.7 | 24.9 | 37.6 | 45.2
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|2020                                                                                                                              | 40.4  | 38.2  | 42.6  | 38.7  | 32.1  | 25.7  | 21.2  | 19.9 | 23.5 | 28.4 | 36.8 | 42.6
|2021                                                                                                                              | 43.8  | 38.2  | 45.3  | 39.7  | 35.9  | 29.6  | 22.6  | 25.9 | 23.7 | 31.4 | 41.0 | 44.3
|2022                                                                                                                              | 44.8  | 41.6  | 44.5  | 38.5  | 36.3  | 28.9  | 26.3  | 27.8 | 18.7 | 33.2 | 37.7 | 42.7
|2023                                                                                                                              | 40.7  | 40.2  | 38.1  | 38.3  | 36.3  | 27.2  | 26.9  | 22.5 | 27.5 | 31.9 | 41.1 | 45.5
|2024                                                                                                                              | 43.4  | 39.6  | 39.0  | 32.0  |       |       |       |      |      |      |      |     
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|- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
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|Release Date: 6/28/2024                                                                                                          
|Next Release Date: 7/31/2024