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NSTAR ELECTRIC COMPANY AND SUBSIDIARY CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDER'S EQUITY - USD ($) $ in Thousands | Total | Common Stock | Capital Surplus, Paid In | Retained Earnings | Accumulated Other Comprehensive Loss | NSTAR Electric | NSTAR Electric Common Stock | NSTAR Electric Capital Surplus, Paid In | NSTAR Electric Retained Earnings | NSTAR Electric Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2021 |  | 344,403,196 |  |  |  |  | 200 |  |  |
Balance at Dec. 31, 2021 | $ 14,599,844 | $ 1,789,092 | $ 8,098,514 | $ 5,005,391 | $ (42,275) | $ 4,973,019 | $ 0 | $ 2,253,942 | $ 2,718,576 | $ 501
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income | 445,326 |  |  | 445,326 |  | 92,739 |  |  | 92,739 |
Dividends on Preferred Stock | (1,880) |  |  | (1,880) |  | (490) |  |  | (490) |
Dividends on Common Stock | (219,768) |  |  | (219,768) |  | (71,900) |  |  | (71,900) |
Other comprehensive income (loss) |  |  |  |  |  | (47) |  |  |  | (47)
Balance (in shares) at Mar. 31, 2022 |  | 344,850,272 |  |  |  |  | 200 |  |  |
Balance at Mar. 31, 2022 | 14,836,690 | $ 1,789,092 | 8,102,618 | 5,229,069 | (41,571) | 4,993,321 | $ 0 | 2,253,942 | 2,738,925 | 454
Balance (in shares) at Dec. 31, 2021 |  | 344,403,196 |  |  |  |  | 200 |  |  |
Balance at Dec. 31, 2021 | 14,599,844 | $ 1,789,092 | 8,098,514 | 5,005,391 | (42,275) | 4,973,019 | $ 0 | 2,253,942 | 2,718,576 | 501
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  | 400,260 |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  | (136) |  |  |  |
Balance (in shares) at Sep. 30, 2022 |  | 347,348,749 |  |  |  |  | 200 |  |  |
Balance at Sep. 30, 2022 | 15,279,173 | $ 1,799,920 | 8,327,477 | 5,429,076 | (41,006) | 5,205,973 | $ 0 | 2,303,942 | 2,901,666 | 365
Balance (in shares) at Mar. 31, 2022 |  | 344,850,272 |  |  |  |  | 200 |  |  |
Balance at Mar. 31, 2022 | 14,836,690 | $ 1,789,092 | 8,102,618 | 5,229,069 | (41,571) | 4,993,321 | $ 0 | 2,253,942 | 2,738,925 | 454
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income | 293,742 |  |  | 293,742 |  | 119,437 |  |  | 119,437 |
Dividends on Preferred Stock | (1,880) |  |  | (1,880) |  | (490) |  |  | (490) |
Dividends on Common Stock | (219,877) |  |  | (219,877) |  | (71,900) |  |  | (71,900) |
Capital Contributions from Eversource Parent |  |  |  |  |  | 50,000 |  | 50,000 |  |
Other comprehensive income (loss) |  |  |  |  |  | (27) |  |  |  | (27)
Balance (in shares) at Jun. 30, 2022 |  | 346,411,029 |  |  |  |  | 200 |  |  |
Balance at Jun. 30, 2022 | 15,057,215 | $ 1,796,056 | 8,242,346 | 5,301,054 | (42,864) | 5,090,341 | $ 0 | 2,303,942 | 2,785,972 | 427
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income | 351,289 |  |  | 351,289 |  | 188,084 |  |  | 188,084 |
Dividends on Preferred Stock | (1,880) |  |  | (1,880) |  | (490) |  |  | (490) |
Dividends on Common Stock | (221,387) |  |  | (221,387) |  | (71,900) |  |  | (71,900) |
Other comprehensive income (loss) |  |  |  |  |  | (62) |  |  |  | (62)
Balance (in shares) at Sep. 30, 2022 |  | 347,348,749 |  |  |  |  | 200 |  |  |
Balance at Sep. 30, 2022 | $ 15,279,173 | $ 1,799,920 | 8,327,477 | 5,429,076 | (41,006) | 5,205,973 | $ 0 | 2,303,942 | 2,901,666 | 365
Balance (in shares) at Dec. 31, 2022 | 348,443,855 | 348,443,855 |  |  |  |  | 200 |  |  |
Balance at Dec. 31, 2022 | $ 15,473,158 | $ 1,799,920 | 8,401,731 | 5,527,153 | (39,421) | 5,700,670 | $ 0 | 2,778,942 | 2,921,444 | 284
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income | 493,039 |  |  | 493,039 |  | 133,813 |  |  | 133,813 |
Dividends on Preferred Stock | (1,880) |  |  | (1,880) |  | (490) |  |  | (490) |
Dividends on Common Stock | (235,354) |  |  | (235,354) |  | (327,400) |  |  | (327,400) |
Capital Contributions from Eversource Parent |  |  |  |  |  | 31,300 |  | 31,300 |  |
Other comprehensive income (loss) |  |  |  |  |  | (16) |  |  |  | (16)
Balance (in shares) at Mar. 31, 2023 |  | 348,808,082 |  |  |  |  | 200 |  |  |
Balance at Mar. 31, 2023 | $ 15,749,371 | $ 1,799,920 | 8,412,085 | 5,782,958 | (36,191) | 5,537,877 | $ 0 | 2,810,242 | 2,727,367 | 268
Balance (in shares) at Dec. 31, 2022 | 348,443,855 | 348,443,855 |  |  |  |  | 200 |  |  |
Balance at Dec. 31, 2022 | $ 15,473,158 | $ 1,799,920 | 8,401,731 | 5,527,153 | (39,421) | 5,700,670 | $ 0 | 2,778,942 | 2,921,444 | 284
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  | 433,267 |  |  |  |
Other comprehensive income (loss) |  |  |  |  |  | (73) |  |  |  |
Balance (in shares) at Sep. 30, 2023 | 349,275,775 | 349,275,775 |  |  |  |  | 200 |  |  |
Balance at Sep. 30, 2023 | $ 15,685,941 | $ 1,799,920 | 8,443,820 | 5,666,861 | (24,022) | 5,928,594 | $ 0 | 2,902,542 | 3,025,841 | 211
Balance (in shares) at Mar. 31, 2023 |  | 348,808,082 |  |  |  |  | 200 |  |  |
Balance at Mar. 31, 2023 | 15,749,371 | $ 1,799,920 | 8,412,085 | 5,782,958 | (36,191) | 5,537,877 | $ 0 | 2,810,242 | 2,727,367 | 268
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income | 17,302 |  |  | 17,302 |  | 134,743 |  |  | 134,743 |
Dividends on Preferred Stock | (1,880) |  |  | (1,880) |  | (490) |  |  | (490) |
Dividends on Common Stock | (235,491) |  |  | (235,491) |  |  |  |  |  |
Capital Contributions from Eversource Parent |  |  |  |  |  | 81,000 |  | 81,000 |  |
Other comprehensive income (loss) |  |  |  |  |  | (27) |  |  |  | (27)
Balance (in shares) at Jun. 30, 2023 |  | 349,021,936 |  |  |  |  | 200 |  |  |
Balance at Jun. 30, 2023 | 15,554,098 | $ 1,799,920 | 8,428,786 | 5,562,889 | (32,103) | 5,753,103 | $ 0 | 2,891,242 | 2,861,620 | 241
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net Income | 341,543 |  |  | 341,543 |  | 164,711 |  |  | 164,711 |
Dividends on Preferred Stock | (1,880) |  |  | (1,880) |  | (490) |  |  | (490) |
Dividends on Common Stock | $ (235,691) |  |  | (235,691) |  |  |  |  |  |
Capital Contributions from Eversource Parent |  |  |  |  |  | 11,300 |  | 11,300 |  |
Other comprehensive income (loss) |  |  |  |  |  | (30) |  |  |  | (30)
Balance (in shares) at Sep. 30, 2023 | 349,275,775 | 349,275,775 |  |  |  |  | 200 |  |  |
Balance at Sep. 30, 2023 | $ 15,685,941 | $ 1,799,920 | $ 8,443,820 | $ 5,666,861 | $ (24,022) | $ 5,928,594 | $ 0 | $ 2,902,542 | $ 3,025,841 | $ 211

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