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|   | x | QUARTERLY      REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF      1934 |
|--------|---|----------------------------------------------------------------------------------------------------|

|   | o      | TRANSITION      REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF      1934 |
|--------|--------|-----------------------------------------------------------------------------------------------------|
|   |   |                                                                                                |
|   |   | For      the transition period from _____ to _____                                                  |

| Delaware                                                                |   | 22-3324608                                |
|-------------------------------------------------------------------------|--------|-------------------------------------------|
| (State      of Other Jurisdictionof      Incorporation or Organization) |   | (I.R.S.      Employer Identification No.) |

| 1314      King Street, Wilmington, Delaware   |   | 19801           |
|-----------------------------------------------|--------|-----------------|
| (Address      of Principal Executive Offices) |   | (Zip      Code) |

|   | (302)      888-7444                                         |   |
|--------|-------------------------------------------------------------|--------|
|   | (Issuer’s      Telephone Number, Including Area Code) |   |

|                                                                                         |
|----------------------------------------------------------------------------------------------|
| (Former      name, former address and former fiscal year, if changed since last      report) |

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TABLE OF CONTENTS

|          |                                                                                                 |       |
|---------------|------------------------------------------------------------------------------------------------------|------------|
| PART      I.  | FINANCIAL      INFORMATION                                                                           | Page  |
|          |                                                                                                 |       |
| Item 1.       | Financial Statements                                                                                 | 1          |
|          |                                                                                                 |       |
| Item 2.       | Management’s Discussion and Analysis of Financial      Conditionand Results of      Operations | 7          |
|          |                                                                                                 |       |
| Item 3.       | Quantitative and Qualitative Disclosures About Market      Risk                                      | 9          |
|          |                                                                                                 |       |
| Item 4.       | Controls and Procedures                                                                              | 9          |
|          |                                                                                                 |       |
| PART      II. | OTHER      INFORMATION                                                                               |       |
|          |                                                                                                 |       |
| Item 1.       | Legal Proceedings                                                                                    | 10         |
|          |                                                                                                 |       |
| Item 1A.      | Risk Factors                                                                                         |  10   |
|          |                                                                                                 |       |
| Item 2.       | Unregistered Sales of Equity Securities and Use of      Proceeds                                     |  10   |
|          |                                                                                                 |       |
| Item 3.       | Defaults Upon Senior Securities                                                                      | 10         |
|          |                                                                                                 |       |
| Item 4.       | Submission of Matters to a Vote of Security      Holders                                             | 10         |
|          |                                                                                                 |       |
| Item 5.       | Other Information                                                                                    |  10   |
|          |                                                                                                 |       |
| Item 6.       | Exhibits                                                                                             | 10         |
|          |                                                                                                 |       |
| SIGNATURES    |                                                                                                 |  11   |

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ITEM 1.   FINANCIAL STATEMENTS

| RIDGEWOOD      ELECTRIC POWER TRUST IV                                                                                                                                                    |   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|
| CONDENSED      CONSOLIDATED BALANCE SHEETS                                                                                                                                                |   |
| (in      thousands, except share data)                                                                                                                                                    |   |
|                                                                                                                                                                                      |   |   |   |   |   |   |
|                                                                                                                                                                                      |   | September      30, |   |   | December      31, |   |
|                                                                                                                                                                                      |   | 2007 |   |   | 2006 |   |
| ASSETS                                                                                                                                                                                    |   | (unaudited) |   |   |   |   |
| Current      assets:                                                                                                                                                                      |   |   |   |   |   |   |
| Cash                                                                                                                                                                                      |   | $ | 816 |   |   | $ | 819 |   |
| Accounts      receivable                                                                                                                                                                  |   |   | 2,641 |   |   |   | 2,252 |   |
| Due      from affiliates                                                                                                                                                                  |   |   | 184 |   |   |   | 59 |   |
| Prepaid      expenses and other current assets                                                                                                                                            |   |   | 222 |   |   |   | 80 |   |
| Total      current assets                                                                                                                                                                 |   |   | 3,863 |   |   |   | 3,210 |   |
| Notes      receivable, affiliates                                                                                                                                                         |   |   | 5,162 |   |   |   | 4,859 |   |
| Investments                                                                                                                                                                               |   |   | 4,930 |   |   |   | 4,776 |   |
| Plant      and equipment, net                                                                                                                                                             |   |   | 7,994 |   |   |   | 8,561 |   |
| Intangibles,      net                                                                                                                                                                     |   |   | 1,405 |   |   |   | 1,857 |   |
| Other      assets                                                                                                                                                                         |   |   | 430 |   |   |   | 405 |   |
|                                                                                                                                                                                      |   |   |   |   |   |   |   |   |
| Total      assets                                                                                                                                                                         |   | $ | 23,784 |   |   | $ | 23,668 |   |
|                                                                                                                                                                                      |   |   |   |   |   |   |   |   |
| LIABILITIES      AND SHAREHOLDERS’ EQUITY                                                                                                                                           |   |   |   |   |   |   |   |   |
| Current      liabilities:                                                                                                                                                                 |   |   |   |   |   |   |   |   |
| Accounts      payable                                                                                                                                                                     |   | $ | 260 |   |   | $ | 432 |   |
| Accrued      royalty expense                                                                                                                                                              |   |   | 497 |   |   |   | 451 |   |
| Due      to affiliates                                                                                                                                                                    |   |   | 734 |   |   |   | 285 |   |
| Total      current liabilities                                                                                                                                                            |   |   | 1,491 |   |   |   | 1,168 |   |
| Minority      interest                                                                                                                                                                    |   |   | 4,223 |   |   |   | 4,566 |   |
| Total  liabilities                                                                                                                                                              |   |   | 5,714 |   |   |   | 5,734 |   |
|                                                                                                                                                                                      |   |   |   |   |   |   |   |   |
| Commitments      and contingencies                                                                                                                                                        |   |   |   |   |   |   |   |   |
|                                                                                                                                                                                      |   |   |   |   |   |   |   |   |
| Shareholders’      equity (deficit):                                                                                                                                                |   |   |   |   |   |   |   |   |
|      Shareholders’      equity (476.8875 Investor Shares          issued      and outstanding)           |   |   | 18,159 |   |   |   | 18,024 |   |
|      Managing      Shareholder’s accumulated deficit         (1      management share issued and outstanding) |   |   | (89 | ) |   |   | (90 | ) |
| Total      shareholders’ equity                                                                                                                                                     |   |   | 18,070 |   |   |   | 17,934 |   |
|                                                                                                                                                                                      |   |   |   |   |   |   |   |   |
| Total      liabilities and shareholders’ equity                                                                                                                                     |   | $ | 23,784 |   |   | $ | 23,668 |   |

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|                                                                                                                                            |   | Nine      Months Ended September 30, |   |   | Three      Months Ended September 30, |   |
|-------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------------------------------------|--------|--------|---------------------------------------|--------|
|                                                                                                                                            |   | 2007                                 |   |   | 2006                                  |   |   | 2007 |   |   | 2006 |   |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |
| Power      generation revenue                                                                                                                   |   | $                                    | 5,730  |   |                                  | $      | 5,607 |   |   | $ | 1,927 |   |   | $ | 1,844 |   |
| Renewable      attribute revenue                                                                                                                |   |                                 | 3,880  |   |                                  |   | 2,882 |   |   |   | 1,308 |   |   |   | 935 |   |
| Sublease      revenue                                                                                                                           |   |                                 | 436    |   |                                  |   | 432 |   |   |   | 144 |   |   |   | 144 |   |
|                    Total      revenues           |   |                                 | 10,046 |   |                                  |   | 8,921 |   |   |   | 3,379 |   |   |   | 2,923 |   |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Cost      of revenues                                                                                                                           |   |                                 | 7,384  |   |                                  |   | 6,656 |   |   |   | 2,388 |   |   |   | 2,155 |   |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Gross      profit                                                                                                                               |   |                                 | 2,662  |   |                                  |   | 2,265 |   |   |   | 991 |   |   |   | 768 |   |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Operating      expenses:                                                                                                                        |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
|         General      and administrative expenses                                                        |   |                                 | 636    |   |                                  |   | 142 |   |   |   | 267 |   |   |   | 30 |   |
|         Management      fee to the Managing Shareholder                                                 |   |                                 | 404    |   |                                  |   | 401 |   |   |   | 135 |   |   |   | 133 |   |
|                    Total      operating expenses |   |                                 | 1,040  |   |                                  |   | 543 |   |   |   | 402 |   |   |   | 163 |   |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Income      from operations                                                                                                                     |   |                                 | 1,622  |   |                                  |   | 1,722 |   |   |   | 589 |   |   |   | 605 |   |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Other      income (expense):                                                                                                                    |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
|      Interest      income, affiliates                                                                                  |   |                                 | 323    |   |                                  |   | 326 |   |   |   | 110 |   |   |   | 108 |   |
|      Interest      expense                                                                                             |   |                                 | -      |   |                                  |   | (43 | ) |   |   | - |   |   |   | (17 | ) |
|      Equity      in income (loss) of Maine Hydro                                                                       |   |                                 | 197    |   |                                  |   | 672 |   |   |   | (351 | ) |   |   | (83 | ) |
|      Equity      in income of Indeck Maine                                                                             |   |                                 | 708    |   |                                  |   | 357 |   |   |   | 260 |   |   |   | 548 |   |
|      Other      income                                                                                                 |   |                                 | 11     |   |                                  |   | - |   |   |   | - |   |   |   | - |   |
|                Total      other income, net                          |   |                                 | 1,239  |   |                                  |   | 1,312 |   |   |   | 19 |   |   |   | 556 |   |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Income      before minority interest                                                                                                            |   |                                 | 2,861  |   |                                  |   | 3,034 |   |   |   | 608 |   |   |   | 1,161 |   |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Minority      interest in the earnings of subsidiaries                                                                                          |   |                                 | (799   | )      |                                  |   | (802 | ) |   |   | (284 | ) |   |   | (270 | ) |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Net      income                                                                                                                                 |   | $                                    | 2,062  |   |                                  | $      | 2,232 |   |   | $ | 324 |   |   | $ | 891 |   |
|                                                                                                                                            |   |                                 |   |   |                                  |   |   |   |   |   |   |   |   |   |   |   |
| Managing      Shareholder – Net income                                                                                                    |   | $                                    | 21     |   |                                  | $      | 22 |   |   | $ | 4 |   |   | $ | 9 |   |
| Shareholders      – Net income                                                                                                            |   |                                 | 2,041  |   |                                  |   | 2,210 |   |   |   | 320 |   |   |   | 882 |   |
| Net      income per Investor Share                                                                                                              |   |                                 | 4,280  |   |                                  |   | 4,634 |   |   |   | 672 |   |   |   | 1,850 |   |
| Distributions      per Investor Share                                                                                                           |   |                                 | 4,000  |   |                                  |   | 5,000 |   |   |   | 1,000 |   |   |   | 2,000 |   |

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|                                                                                                                                                           |   | Nine      Months Ended September 30, |   |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------------------------------------|--------|
|                                                                                                                                                           |   | 2007                                 |   |   | 2006 |   |
| Cash      flows from operating activities:                                                                                                                     |   |                                 |   |   |   |   |
|                 Net      cash provided by operating activities                 |   | $                                    | 3,083  |   |   | $ | 3,495 |   |
|                                                                                                                                                           |   |                                 |   |   |   |   |   |   |
| Cash      flows from investing activities:                                                                                                                     |   |                                 |   |   |   |   |   |   |
|       Proceeds      from notes receivable, affiliates                                                                            |   |                                 | -      |   |   |   | 207 |   |
|       Proceeds      from sale of equipment                                                                                       |   |                                 | 11     |   |   |   | - |   |
|       Capital      expenditures                                                                                                  |   |                                 | (29    | ) |   |   | - |   |
|                  Net      cash (used in) provided by investing activities |   |                                 | (18    | ) |   |   | 207 |   |
|                                                                                                                                                           |   |                                 |   |   |   |   |   |   |
| Cash      flows from financing activities:                                                                                                                     |   |                                 |   |   |   |   |   |   |
|       Cash      distribution to minority interest                                                                                |   |                                 | (1,142 | ) |   |   | (964 | ) |
|       Cash      distribution to shareholders                                                                                     |   |                                 | (1,926 | ) |   |   | (2,409 | ) |
|                  Net      cash used in financing activities               |   |                                 | (3,068 | ) |   |   | (3,373 | ) |
|                                                                                                                                                           |   |                                 |   |   |   |   |   |   |
| Net      (decrease) increase in cash                                                                                                                           |   |                                 | (3     | ) |   |   | 329 |   |
| Cash,      beginning of period                                                                                                                                 |   |                                 | 819    |   |   |   | 639 |   |
| Cash,      end of period                                                                                                                                       |   | $                                    | 816    |   |   | $ | 968 |   |

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|                                             |   | Nine      Months EndedSeptember      30, |      |   | Three      Months Ended September      30, |   |
|--------------------------------------------------|--------|------------------------------------------|-----------|--------|--------------------------------------------|--------|
|                                             |   | 2007                                     |      |   | 2006                                       |   |   | 2007 |   |   | 2006 |   |
|                                             |   |                                     |      |   |                                       |   |   |   |   |   |   |   |
| Revenues                                         |   | $                                        | 2,875     |   |                                       | $      | 3,612 |   |   | $ | 111 |   |   | $ | 581 |   |
|                                             |   |                                     |      |   |                                       |   |   |   |   |   |   |   |   |   |   |   |
| Gross      profit (loss)                         |   |                                     | 728       |   |                                       |   | 1,477 |   |   |   | (616 | ) |   |   | (106 | ) |
|                                             |   |                                     |      |   |                                       |   |   |   |   |   |   |   |   |   |   |   |
| Income      (loss ) from operations              |   |                                     | 394       |   |                                       |   | 1,393 |   |   |   | (702 | )  |   |   | (152 | ) |
|                                             |   |                                     |      |   |                                       |   |   |   |   |   |   |   |   |   |   |   |
| Net      income (loss)                           |   | $                                        | 394  |   |                                       | $      | 1,344  |   |   | $ | (702 | ) |   | $ | (167 | ) |
|                                             |   |                                     |      |   |                                       |   |   |   |   |   |   |   |   |   |   |   |
| Trust      share of income (loss) in Maine Hydro |   | $                                        | 197       |   |                                       | $      | 672 |   |   | $ | (351 | ) |   | $ | (83 | ) |

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|                                       |   | Nine      Months Ended September      30, |   |   | Three      Months Ended September      30, |   |
|--------------------------------------------|--------|-------------------------------------------|--------|--------|--------------------------------------------|--------|
|                                       |   | 2007                                      |   |   | 2006                                       |   |   | 2007 |   |   | 2006 |   |
|                                       |   |                                      |   |   |                                       |   |   |   |   |   |   |   |
| Revenues                                   |   | $                                         | 27,517 |   |                                       | $      | 24,566 |   |   | $ | 9,188 |   |   | $ | 8,881 |   |
|                                       |   |                                      |   |   |                                       |   |   |   |   |   |   |   |   |   |   |   |
| Gross      profit                          |   |                                      | 3,228  |   |                                       |   | 2,531 |   |   |   | 1,056 |   |   |   | 1,767 |   |
|                                       |   |                                      |   |   |                                       |   |   |   |   |   |   |   |   |   |   |   |
| Income      from operations                |   |                                      | 2,922  |   |                                       |   | 2,250 |   |   |   | 1,013 |   |   |   | 1,609 |   |
|                                       |   |                                      |   |   |                                       |   |   |   |   |   |   |   |   |   |   |   |
| Net      income                            |   | $                                         | 1,838  |   |                                       | $      | 1,154 |   |   | $ | 653 |   |   | $ | 1,256 |   |
|                                       |   |                                      |   |   |                                       |   |   |   |   |   |   |   |   |   |   |   |
| Trust      share of income in Indeck Maine |   | $                                         | 708    |   |                                       | $      | 357 |   |   | $ | 260 |   |   | $ | 548 |   |

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ITEM 2.   MANAGEMENT’S DISCUSSION AND ANALYSIS OFFINANCIAL CONDITION AND RESULTS OF OPERATIONS

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ITEM 3.   QUANTITATIVE AND QUALITATIVE DISCLOSURESABOUT MARKET RISK

ITEM 4.   CONTROLS AND PROCEDURES

|   | (i) | a      lack of sufficient personnel with relevant experience to develop,      administer and monitor disclosure controls and procedures to enable the      Trust to comply efficiently, or on a timely basis, with its financial      reporting obligations, |
|--------|-----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (ii) | inadequate      disclosure controls and procedures, including inadequate record retention      and review policies that would enable the Trust to meet its financial      reporting and disclosure obligations in an efficient and timely      manner. |
|--------|------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|  | · | During      the fourth quarter of 2007, the Trust expanded its disclosure controls and      procedures. The Trust documented many of its existing informal procedures,      established a compliance-focused disclosure committee, formalized monthly      closing procedures, and implemented a corporate whistleblower      policy. |
|--|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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ITEM 1.     LEGAL PROCEEDINGS

ITEM 1A.  RISK FACTORS

ITEM 2.     UNREGISTERED SALES OF EQUITY SECURITIESAND USE OF PROCEEDS

ITEM 3.     DEFAULTS UPON SENIORSECURITIES

ITEM 4.     SUBMISSION OF MATTERS TO A VOTE OFSECURITY HOLDERS

ITEM 5.     OTHER INFORMATION

ITEM 6.     EXHIBITS

| Exhibit No. |   | Description                                                                                                                                                                                                                                                                              |
|-------------|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|        |   |                                                                                                                                                                                                                                                                                     |
| 31.1        | *      | Certification      of Randall D. Holmes, Chief Executive Officer of the Registrant, pursuant      to Securities Exchange Act Rule 13a-14(a).                                                                                                                                             |
|        |   |                                                                                                                                                                                                                                                                                     |
| 31.2        | *      | Certification      of Jeffrey H. Strasberg, Chief Financial Officer of the Registrant,      pursuant to Securities Exchange Act Rule 13a-14(a).                                                                                                                                          |
|        |   |                                                                                                                                                                                                                                                                                     |
| 32          | *      | Certifications      pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of      The Sarbanes-Oxley Act of 2002, signed by Randall D. Holmes, Chief      Executive Officer of the Registrant, and Jeffrey H. Strasberg, Chief      Financial Officer of theRegistrant. |

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SIGNATURES

|                         | RIDGEWOOD ELECTRIC      POWER TRUST IV |                               |
|------------------------------|---------------------------------------------|------------------------------------|
|                         |                                        |                               |   |
|                         |                                        |                               |   |
| Date:      February 20, 2008 | By:                                         | /s/       Randall D. Holmes   |   |
|                         |                                        | Randall      D. Holmes             |   |
|                         |                                        | Chief      Executive Officer       |   |
|                         |                                        | (Principal      Executive Officer) |   |

|                         |   |                                                      |   |
|------------------------------|--------|-----------------------------------------------------------|--------|
| Date:      February 20, 2008 | By:    | /s/       Jeffrey H. Strasberg                       |   |
|                         |   | Jeffrey      H. Strasberg                                 |   |
|                         |   | Executive      Vice President and Chief Financial Officer |   |
|                         |   | (Principal      Financial and Accounting Officer)         |   |

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