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CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Adoption of New Accounting Standard | Common Shares | Capital Surplus, Paid In | Retained Earnings | Retained Earnings Adoption of New Accounting Standard | Accumulated Other Comprehensive (Loss)/Income | Treasury Stock | The Connecticut Light and Power Company | The Connecticut Light and Power Company Adoption of New Accounting Standard | The Connecticut Light and Power Company Common Shares | The Connecticut Light and Power Company Capital Surplus, Paid In | The Connecticut Light and Power Company Retained Earnings | The Connecticut Light and Power Company Retained Earnings Adoption of New Accounting Standard | The Connecticut Light and Power Company Accumulated Other Comprehensive (Loss)/Income | NSTAR Electric Company | NSTAR Electric Company Adoption of New Accounting Standard | NSTAR Electric Company Common Shares | NSTAR Electric Company Capital Surplus, Paid In | NSTAR Electric Company Retained Earnings | NSTAR Electric Company Retained Earnings Adoption of New Accounting Standard | NSTAR Electric Company Accumulated Other Comprehensive (Loss)/Income | Public Service Company of New Hampshire | Public Service Company of New Hampshire Adoption of New Accounting Standard | Public Service Company of New Hampshire Common Shares | Public Service Company of New Hampshire Capital Surplus, Paid In | Public Service Company of New Hampshire Retained Earnings | Public Service Company of New Hampshire Retained Earnings Adoption of New Accounting Standard | Public Service Company of New Hampshire Accumulated Other Comprehensive (Loss)/Income
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Balance (in shares) at Dec. 31, 2019 |  |  | 329,880,645 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Dec. 31, 2019 | $ 12,629,994 | $ (1,514) | $ 1,729,292 | $ 7,087,768 | $ 4,177,048 | $ (1,514) | $ (65,059) | $ (299,055) | $ 4,387,825 | $ (900) | $ 60,352 | $ 2,535,765 | $ 1,791,392 | $ (900) | $ 316 | $ 4,159,884 | $ (161) | $ 0 | $ 1,813,442 | $ 2,346,287 | $ (161) | $ 155 | $ 1,391,733 | $ (300) | $ 0 | $ 903,134 | $ 490,306 | $ (300) | $ (1,707)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 336,633 |  |  |  | 336,633 |  |  |  | 118,738 |  |  |  | 118,738 |  |  | 100,390 |  |  |  | 100,390 |  |  | 39,601 |  |  |  | 39,601 |  |
Dividends on Preferred Stock | (1,880) |  |  |  | (1,880) |  |  |  | (1,390) |  |  |  | (1,390) |  |  | (490) |  |  |  | (490) |  |  |  |  |  |  |  |  |
Dividends on Common Stock | (187,462) |  |  |  | (187,462) |  |  |  | (69,500) |  |  |  | (69,500) |  |  | (196,500) |  |  |  | (196,500) |  |  | (22,300) |  |  |  | (22,300) |  |
Issuance of Common Shares (in shares) |  |  | 5,960,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Shares | 432,100 |  | $ 29,800 | 402,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Incentive Plan Activity | (15,295) |  |  | (15,295) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares (in shares) |  |  | 570,542 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares | 27,746 |  |  | 17,230 |  |  |  | 10,516 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Expense | (12,314) |  |  | (12,314) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) | 1,948 |  |  |  |  |  | 1,948 |  | (1) |  |  |  |  |  | (1) | 67 |  |  |  |  |  | 67 | 278 |  |  |  |  |  | 278
Balance (in shares) at Mar. 31, 2020 |  |  | 336,411,187 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Mar. 31, 2020 | 13,209,956 |  | $ 1,759,092 | 7,479,689 | 4,322,825 |  | (63,111) | (288,539) | 4,434,772 |  | $ 60,352 | 2,535,765 | 1,838,340 |  | 315 | 4,063,190 |  | $ 0 | 1,813,442 | 2,249,526 |  | 222 | 1,409,012 |  | $ 0 | 903,134 | 507,307 |  | (1,429)
Balance (in shares) at Dec. 31, 2019 |  |  | 329,880,645 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Dec. 31, 2019 | 12,629,994 | $ (1,514) | $ 1,729,292 | 7,087,768 | 4,177,048 | $ (1,514) | (65,059) | (299,055) | 4,387,825 | $ (900) | $ 60,352 | 2,535,765 | 1,791,392 | $ (900) | 316 | 4,159,884 | $ (161) | $ 0 | 1,813,442 | 2,346,287 | $ (161) | 155 | 1,391,733 | $ (300) | $ 0 | 903,134 | 490,306 | $ (300) | (1,707)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 938,883 |  |  |  |  |  |  |  | 356,106 |  |  |  |  |  |  | 363,585 |  |  |  |  |  |  | 118,384 |  |  |  |  |  |
Dividends on Preferred Stock | (5,600) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) | 4,662 |  |  |  |  |  |  |  | (9) |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 823 |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2020 |  |  | 342,797,473 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Sep. 30, 2020 | 13,980,017 |  | $ 1,789,092 | 7,996,976 | 4,535,860 |  | (60,397) | (281,514) | 4,794,352 |  | $ 60,352 | 2,660,765 | 2,072,928 |  | 307 | 4,325,539 |  | $ 0 | 1,813,442 | 2,511,742 |  | 355 | 1,488,340 |  | $ 0 | 903,134 | 586,090 |  | (884)
Balance (in shares) at Mar. 31, 2020 |  |  | 336,411,187 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Mar. 31, 2020 | 13,209,956 |  | $ 1,759,092 | 7,479,689 | 4,322,825 |  | (63,111) | (288,539) | 4,434,772 |  | $ 60,352 | 2,535,765 | 1,838,340 |  | 315 | 4,063,190 |  | $ 0 | 1,813,442 | 2,249,526 |  | 222 | 1,409,012 |  | $ 0 | 903,134 | 507,307 |  | (1,429)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 254,112 |  |  |  | 254,112 |  |  |  | 117,271 |  |  |  | 117,271 |  |  | 97,468 |  |  |  | 97,468 |  |  | 31,632 |  |  |  | 31,632 |  |
Dividends on Preferred Stock | (1,880) |  |  |  | (1,880) |  |  |  | (1,390) |  |  |  | (1,390) |  |  | (490) |  |  |  | (490) |  |  |  |  |  |  |  |  |
Dividends on Common Stock | (190,964) |  |  |  | (190,964) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Shares (in shares) |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Common Shares | 517,560 |  | $ 30,000 | 487,560 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Incentive Plan Activity | 7,694 |  |  | 7,694 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares (in shares) |  |  | 216,675 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares | 16,548 |  |  | 12,524 |  |  |  | 4,024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Stock Expense | (8,321) |  |  | (8,321) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) | 553 |  |  |  |  |  | 553 |  | 3 |  |  |  |  |  | 3 | 68 |  |  |  |  |  | 68 | 285 |  |  |  |  |  | 285
Balance (in shares) at Jun. 30, 2020 |  |  | 342,627,862 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Jun. 30, 2020 | 13,805,258 |  | $ 1,789,092 | 7,979,146 | 4,384,093 |  | (62,558) | (284,515) | 4,550,656 |  | $ 60,352 | 2,535,765 | 1,954,221 |  | 318 | 4,160,236 |  | $ 0 | 1,813,442 | 2,346,504 |  | 290 | 1,440,929 |  | $ 0 | 903,134 | 538,939 |  | (1,144)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 348,140 |  |  |  | 348,140 |  |  |  | 120,097 |  |  |  | 120,097 |  |  | 165,728 |  |  |  | 165,728 |  |  | 47,151 |  |  |  | 47,151 |  |
Dividends on Preferred Stock | (1,880) |  |  |  | (1,880) |  |  |  | (1,390) |  |  |  | (1,390) |  |  | (490) |  |  |  | (490) |  |  |  |  |  |  |  |  |
Dividends on Common Stock | (194,493) |  |  |  | (194,493) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Contributions from Eversource Parent |  |  |  |  |  |  |  |  | 125,000 |  |  | 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Incentive Plan Activity | 6,921 |  |  | 6,921 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares (in shares) |  |  | 169,611 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares | 13,910 |  |  | 10,909 |  |  |  | 3,001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) | 2,161 |  |  |  |  |  | 2,161 |  | (11) |  |  |  |  |  | (11) | 65 |  |  |  |  |  | 65 | 260 |  |  |  |  |  | 260
Balance (in shares) at Sep. 30, 2020 |  |  | 342,797,473 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Sep. 30, 2020 | $ 13,980,017 |  | $ 1,789,092 | 7,996,976 | 4,535,860 |  | (60,397) | (281,514) | 4,794,352 |  | $ 60,352 | 2,660,765 | 2,072,928 |  | 307 | 4,325,539 |  | $ 0 | 1,813,442 | 2,511,742 |  | 355 | 1,488,340 |  | $ 0 | 903,134 | 586,090 |  | (884)
Balance (in shares) at Dec. 31, 2020 | 342,954,023 |  | 342,954,023 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Dec. 31, 2020 | $ 14,063,566 |  | $ 1,789,092 | 8,015,663 | 4,613,201 |  | (76,411) | (277,979) | 5,044,786 |  | $ 60,352 | 2,810,765 | 2,173,367 |  | 302 | 4,521,418 |  | $ 0 | 1,993,942 | 2,527,167 |  | 309 | 1,542,539 |  | $ 0 | 928,134 | 615,018 |  | (613)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 368,023 |  |  |  | 368,023 |  |  |  | 98,398 |  |  |  | 98,398 |  |  | 93,924 |  |  |  | 93,924 |  |  | 44,676 |  |  |  | 44,676 |  |
Dividends on Preferred Stock | (1,880) |  |  |  | (1,880) |  |  |  | (1,390) |  |  |  | (1,390) |  |  | (490) |  |  |  | (490) |  |  |  |  |  |  |  |  |
Dividends on Common Stock | (206,913) |  |  |  | (206,913) |  |  |  | (70,100) |  |  |  | (70,100) |  |  | (206,400) |  |  |  | (206,400) |  |  | (25,200) |  |  |  | (25,200) |  |
Long-Term Incentive Plan Activity | (15,727) |  |  | (15,727) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares (in shares) |  |  | 480,275 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares | 25,163 |  |  | 16,182 |  |  |  | 8,981 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) | 1,188 |  |  |  |  |  | 1,188 |  | (32) |  |  |  |  |  | (32) | 61 |  |  |  |  |  | 61 | 255 |  |  |  |  |  | 255
Balance (in shares) at Mar. 31, 2021 |  |  | 343,434,298 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Mar. 31, 2021 | $ 14,233,420 |  | $ 1,789,092 | 8,016,118 | 4,772,431 |  | (75,223) | (268,998) | 5,071,662 |  | $ 60,352 | 2,810,765 | 2,200,275 |  | 270 | 4,408,513 |  | $ 0 | 1,993,942 | 2,414,201 |  | 370 | 1,562,270 |  | $ 0 | 928,134 | 634,494 |  | (358)
Balance (in shares) at Dec. 31, 2020 | 342,954,023 |  | 342,954,023 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Dec. 31, 2020 | $ 14,063,566 |  | $ 1,789,092 | 8,015,663 | 4,613,201 |  | (76,411) | (277,979) | 5,044,786 |  | $ 60,352 | 2,810,765 | 2,173,367 |  | 302 | 4,521,418 |  | $ 0 | 1,993,942 | 2,527,167 |  | 309 | 1,542,539 |  | $ 0 | 928,134 | 615,018 |  | (613)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 919,468 |  |  |  |  |  |  |  | 284,107 |  |  |  |  |  |  | 382,287 |  |  |  |  |  |  | 123,452 |  |  |  |  |  |
Dividends on Preferred Stock | (5,600) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) | $ 4,546 |  |  |  |  |  |  |  | (38) |  |  |  |  |  |  | 166 |  |  |  |  |  |  | 640 |  |  |  |  |  |
Balance (in shares) at Sep. 30, 2021 | 343,774,324 |  | 343,774,324 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Sep. 30, 2021 | $ 14,411,611 |  | $ 1,789,092 | 8,050,872 | 4,906,151 |  | (71,865) | (262,639) | 5,114,385 |  | $ 60,352 | 2,810,765 | 2,243,004 |  | 264 | 4,679,201 |  | $ 0 | 2,053,942 | 2,624,784 |  | 475 | 1,591,031 |  | $ 0 | 1,088,134 | 502,870 |  | 27
Balance (in shares) at Mar. 31, 2021 |  |  | 343,434,298 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Mar. 31, 2021 | 14,233,420 |  | $ 1,789,092 | 8,016,118 | 4,772,431 |  | (75,223) | (268,998) | 5,071,662 |  | $ 60,352 | 2,810,765 | 2,200,275 |  | 270 | 4,408,513 |  | $ 0 | 1,993,942 | 2,414,201 |  | 370 | 1,562,270 |  | $ 0 | 928,134 | 634,494 |  | (358)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 266,400 |  |  |  | 266,400 |  |  |  | 115,556 |  |  |  | 115,556 |  |  | 110,912 |  |  |  | 110,912 |  |  | 34,633 |  |  |  | 34,633 |  |
Dividends on Preferred Stock | (1,880) |  |  |  | (1,880) |  |  |  | (1,390) |  |  |  | (1,390) |  |  | (490) |  |  |  | (490) |  |  |  |  |  |  |  |  |
Dividends on Common Stock | (206,893) |  |  |  | (206,893) |  |  |  | (70,100) |  |  |  | (70,100) |  |  | (76,800) |  |  |  | (76,800) |  |  | (185,200) |  |  |  | (185,200) |  |
Capital Contributions from Eversource Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000 |  |  | 60,000 |  |  |  | 160,000 |  |  | 160,000 |  |  |
Long-Term Incentive Plan Activity | 6,162 |  |  | 6,162 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares (in shares) |  |  | 166,805 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares | 13,799 |  |  | 10,679 |  |  |  | 3,120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) | 881 |  |  |  |  |  | 881 |  | 3 |  |  |  |  |  | 3 | 141 |  |  |  |  |  | 141 | 282 |  |  |  |  |  | 282
Balance (in shares) at Jun. 30, 2021 |  |  | 343,601,103 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Jun. 30, 2021 | 14,311,889 |  | $ 1,789,092 | 8,032,959 | 4,830,058 |  | (74,342) | (265,878) | 5,115,731 |  | $ 60,352 | 2,810,765 | 2,244,341 |  | 273 | 4,502,276 |  | $ 0 | 2,053,942 | 2,447,823 |  | 511 | 1,571,985 |  | $ 0 | 1,088,134 | 483,927 |  | (76)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | 285,046 |  |  |  | 285,046 |  |  |  | 70,153 |  |  |  | 70,153 |  |  | 177,451 |  |  |  | 177,451 |  |  | 44,143 |  |  |  | 44,143 |  |
Dividends on Preferred Stock | (1,880) |  |  |  | (1,880) |  |  |  | (1,390) |  |  |  | (1,390) |  |  | (490) |  |  |  | (490) |  |  |  |  |  |  |  |  |
Dividends on Common Stock | (207,073) |  |  |  | (207,073) |  |  |  | (70,100) |  |  |  | (70,100) |  |  |  |  |  |  |  |  |  | (25,200) |  |  |  | (25,200) |  |
Long-Term Incentive Plan Activity | 6,478 |  |  | 6,478 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares (in shares) |  |  | 173,221 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Treasury Shares | 14,674 |  |  | 11,435 |  |  |  | 3,239 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) | $ 2,477 |  |  |  |  |  | 2,477 |  | (9) |  |  |  |  |  | (9) | (36) |  |  |  |  |  | (36) | 103 |  |  |  |  |  | 103
Balance (in shares) at Sep. 30, 2021 | 343,774,324 |  | 343,774,324 |  |  |  |  |  |  |  | 6,035,205 |  |  |  |  |  |  | 200 |  |  |  |  |  |  | 301 |  |  |  |
Balance at Sep. 30, 2021 | $ 14,411,611 |  | $ 1,789,092 | $ 8,050,872 | $ 4,906,151 |  | $ (71,865) | $ (262,639) | $ 5,114,385 |  | $ 60,352 | $ 2,810,765 | $ 2,243,004 |  | $ 264 | $ 4,679,201 |  | $ 0 | $ 2,053,942 | $ 2,624,784 |  | $ 475 | $ 1,591,031 |  | $ 0 | $ 1,088,134 | $ 502,870 |  | $ 27

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