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**UNITED      STATES**

**SECURITIES      AND EXCHANGE COMMISSION**

**FORM      10-Q**

| 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                _____ |
|--------|-----------------------------------------------------------------------------|

**RIDGEWOOD      ELECTRIC POWER TRUST IV**

| 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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**RIDGEWOOD      ELECTRIC POWER TRUST IV**

**FORM      10-Q**

**INDEX**

|                    |                                                                                            |   | Page   |   |
|-------------------------|-------------------------------------------------------------------------------------------------|--------|--------|--------|
| PART                I.  | FINANCIAL                INFORMATION                                                            |   |   |   |
|                    |                                                                                            |   |   |   |
| Item                1.  | Financial                Statements                                                             |   |   | 3      |   |
|                    |                                                                                            |   |   |   |   |
| Item                2.  | Management’s                Discussion and Analysis of Financial                Condition |   |   |   |   |
|                    |    and                Results of Operations                                      |   |   | 9      |   |
|                    |                                                                                            |   |   |   |   |
| Item                3.  | Quantitative                and Qualitative Disclosures About Market                Risk        |   |   | 11     |   |
|                    |                                                                                            |   |   |   |   |
| Item                4.  | Controls                and Procedures                                                          |   |   | 11     |   |
|                    |                                                                                            |   |   |   |   |
| PART                II. | OTHER                INFORMATION                                                                |   |   |   |   |
|                    |                                                                                            |   |   |   |   |
| Item                1.  | Legal                Proceedings                                                                |   |   | 12     |   |
|                    |                                                                                            |   |   |   |   |
| Item                1A. | Risk                Factors                                                                     |   |   | 12     |   |
|                    |                                                                                            |   |   |   |   |
| Item                2.  | Unregistered                Sales of Equity Securities and Use of                Proceeds       |   |   | 12     |   |
|                    |                                                                                            |   |   |   |   |
| Item                3.  | Defaults                Upon Senior Securities                                                  |   |   | 13     |   |
|                    |                                                                                            |   |   |   |   |
| Item                4.  | Submission                of Matters to a Vote of Security                Holders               |   |   | 13     |   |
|                    |                                                                                            |   |   |   |   |
| Item                5.  | Other                Information                                                                |   |   | 13     |   |
|                    |                                                                                            |   |   |   |   |
| Item                6.  | Exhibits                                                                                        |   |   | 13     |   |
|                    |                                                                                            |   |   |   |   |
| SIGNATURES              |                                                                                            |   |   | 14     |   |

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**PART      I.   FINANCIAL INFORMATION**

**ITEM      1.   FINANCIAL      STATEMENTS**

**RIDGEWOOD        ELECTRIC POWER TRUST IV**

**CONDENSED        CONSOLIDATED BALANCE SHEETS**

*(in          thousands, except share data)*

|                                                                                                                                                                                                              |   | March                  31, |   |   | December                  31, |   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|----------------------------|--------|--------|-------------------------------|--------|
|                                                                                                                                                                                                              |   | 2006                       |   |   | 2005                          |   |
| ASSETS                                                                                                                                                                                                            |   | (unaudited)                |   |   |                          |   |
| Current                  assets:                                                                                                                                                                                  |   |                       |   |   |                          |   |
| Cash                                                                                                                                                                                                              |   | $                          | 1,030  |   |                          | $      | 639 |   |
| Accounts                  receivable                                                                                                                                                                              |   |                       | 1,865  |   |                          |   | 2,045 |   |
| Notes                  receivable, affiliates – current portion                                                                                                                                             |   |                       | -      |   |                          |   | 207 |   |
| Due                  from affiliates                                                                                                                                                                              |   |                       | 58     |   |                          |   | 95 |   |
| Prepaid                  expenses and other current assets                                                                                                                                                        |   |                       | 104    |   |                          |   | 102 |   |
|         Total                  current assets                                                                                                                             |   |                       | 3,057  |   |                          |   | 3,088 |   |
| Notes                  receivable, affiliates – noncurrent portion                                                                                                                                          |   |                       | 5,027  |   |                          |   | 4,926 |   |
| Investments                                                                                                                                                                                                       |   |                       | 4,480  |   |                          |   | 4,174 |   |
| Plant                  and equipment, net                                                                                                                                                                         |   |                       | 9,173  |   |                          |   | 9,351 |   |
| Intangibles,                  net                                                                                                                                                                                 |   |                       | 2,309  |   |                          |   | 2,460 |   |
| Other                  assets                                                                                                                                                                                     |   |                       | 405    |   |                          |   | 405 |   |
|                                                                                                                                                                                                              |   |                       |   |   |                          |   |   |   |
| Total                  assets                                                                                                                                                                                     |   | $                          | 24,451 |   |                          | $      | 24,404 |   |
|                                                                                                                                                                                                              |   |                       |   |   |                          |   |   |   |
| LIABILITIES                  AND SHAREHOLDERS’ EQUITY                                                                                                                                                       |   |                       |   |   |                          |   |   |   |
| Current                  liabilities:                                                                                                                                                                             |   |                       |   |   |                          |   |   |   |
| Accounts                  payable                                                                                                                                                                                 |   | $                          | 264    |   |                          | $      | 582 |   |
| Accrued                  royalty expense                                                                                                                                                                          |   |                       | 419    |   |                          |   | 409 |   |
| Due                  to affiliates                                                                                                                                                                                |   |                       | 766    |   |                          |   | 943 |   |
| Total                  current liabilities                                                                                                                                                                        |   |                       | 1,449  |   |                          |   | 1,934 |   |
| Minority                  interest                                                                                                                                                                                |   |                       | 4,937  |   |                          |   | 4,632 |   |
| Total  liabilities                                                                                                                                                                                      |   |                       | 6,386  |   |                          |   | 6,566 |   |
|                                                                                                                                                                                                              |   |                       |   |   |                          |   |   |   |
| Commitments                  and contingencies                                                                                                                                                                    |   |                       |   |   |                          |   |   |   |
|                                                                                                                                                                                                              |   |                       |   |   |                          |   |   |   |
| Shareholders’                  equity:                                                                                                                                                                      |   |                       |   |   |                          |   |   |   |
|      Shareholders’                  equity (476.8875 Investor Shares          issued                  and outstanding)           |   |                       | 18,153 |   |                          |   | 17,928 |   |
|      Managing                  Shareholder’s accumulated deficit         (1                  management share issued and outstanding) |   |                       | (88    | )      |                          |   | (90 | ) |
|               Total                  shareholders’ equity                                                                             |   |                       | 18,065 |   |                          |   | 17,838 |   |
|                                                                                                                                                                                                              |   |                       |   |   |                          |   |   |   |
|               Total                  liabilities and shareholders’ equity                                                             |   | $                          | 24,451 |   |                          | $      | 24,404 |   |

*The      accompanying notes are an integral part of these financial      statements.*

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**RIDGEWOOD        ELECTRIC POWER TRUST IV**

**CONDENSED          CONSOLIDATED STATEMENTS OF OPERATIONS**

*(unaudited,            in thousands, except per share data)*

|                                                                                                                                                        |   | Three                  Months Ended March 31, |   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------------------------|--------|
|                                                                                                                                                        |   | 2006                                          |   |   | 2005 |   |
|                                                                                                                                                        |   |                                          |   |   |   |   |
| Power                  generation revenue                                                                                                                   |   | $                                             | 1,879  |   |   | $ | 1,917 |   |
| Renewable                  attribute revenue                                                                                                                |   |                                          | 989    |   |   |   | 1,057 |   |
| Sublease                  revenue                                                                                                                           |   |                                          | 144    |   |   |   | 143 |   |
|       Total                  revenues                                                                                         |   |                                          | 3,012  |   |   |   | 3,117 |   |
|                                                                                                                                                        |   |                                          |   |   |   |   |   |   |
| Cost                  of revenues                                                                                                                           |   |                                          | 2,164  |   |   |   | 2,202 |   |
|                                                                                                                                                        |   |                                          |   |   |   |   |   |   |
| Gross                  profit                                                                                                                               |   |                                          | 848    |   |   |   | 915 |   |
|                                                                                                                                                        |   |                                          |   |   |   |   |   |   |
| Operating                  expenses:                                                                                                                        |   |                                          |   |   |   |   |   |   |
|         General                  and administrative expenses                                                        |   |                                          | 67     |   |   |   | 67 |   |
|         Management                  fee to the Managing Shareholder                                                 |   |                                          | 134    |   |   |   | 112 |   |
|                    Total                  operating expenses |   |                                          | 201    |   |   |   | 179 |   |
|                                                                                                                                                        |   |                                          |   |   |   |   |   |   |
| Income                  from operations                                                                                                                     |   |                                          | 647    |   |   |   | 736 |   |
|                                                                                                                                                        |   |                                          |   |   |   |   |   |   |
| Other                  income (expense):                                                                                                                    |   |                                          |   |   |   |   |   |   |
|      Interest                  income                                                                                              |   |                                          | 112    |   |   |   | 56 |   |
|      Interest                  expense                                                                                             |   |                                          | (12    | ) |   |   | (12 | ) |
|      Equity                  in income of Maine Hydro                                                                              |   |                                          | 376    |   |   |   | 226 |   |
|      Equity                  in income (loss) of Indeck Maine                                                                      |   |                                          | 130    |   |   |   | (560 | ) |
|                  Total                  other income (expense), net    |   |                                          | 606    |   |   |   | (290 | ) |
|                                                                                                                                                        |   |                                          |   |   |   |   |   |   |
| Income                  before minority interest                                                                                                            |   |                                          | 1,253  |   |   |   | 446 |   |
|                                                                                                                                                        |   |                                          |   |   |   |   |   |   |
| Minority                  interest in the earnings of subsidiaries                                                                                          |   |                                          | (305   | ) |   |   | (343 | ) |
|                                                                                                                                                        |   |                                          |   |   |   |   |   |   |
|                  Net                  income                           |   | $                                             | 948    |   |   | $ | 103 |   |
|                                                                                                                                                        |   |                                          |   |   |   |   |   |   |
| Managing                  Shareholder – Net income                                                                                                    |   | $                                             | 9      |   |   | $ | 1 |   |
| Shareholders                  – Net income                                                                                                            |   |                                          | 939    |   |   |   | 102 |   |
| Net                  income per Investor Share                                                                                                              |   |                                          | 1,968  |   |   |   | 214 |   |
| Distributions                  per Investor Share                                                                                                           |   |                                          | 1,500  |   |   |   | 1,000 |   |

*The      accompanying notes are an integral part of these financial      statements.*

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**RIDGEWOOD        ELECTRIC POWER TRUST IV**

**CONDENSED          CONSOLIDATED STATEMENTS OF CASH FLOWS**

*(unaudited,            in thousands)*

|                                                                                                                                                                 |   | Three                  Months Ended March 31, |   |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------------------------|--------|
|                                                                                                                                                                 |   | 2006                                          |   |   | 2005 |   |
| Cash                  flows from operating activities:                                                                                                               |   |                                          |   |   |   |   |
|                 Net                  cash provided by (used in) operating activities |   | $                                             | 926    |   |   | $ | (166 | ) |
|                                                                                                                                                                 |   |                                          |   |   |   |   |   |   |
| Cash                  flows from investing activities:                                                                                                               |   |                                          |   |   |   |   |   |   |
|       Capital                  expenditures                                                                                            |   |                                          | (20    | ) |   |   | - |   |
|       Repayment                  of notes receivable, affiliates                                                                       |   |                                          | 207    |   |   |   | - |   |
|                  Net                  cash provided by investing activities     |   |                                          | 187    |   |   |   | - |   |
|                                                                                                                                                                 |   |                                          |   |   |   |   |   |   |
| Cash                  flows from financing activities:                                                                                                               |   |                                          |   |   |   |   |   |   |
|       Cash                  distribution to shareholders                                                                               |   |                                          | (722   | ) |   |   | (482 | ) |
|                                                                                                                                                                 |   |                                          |   |   |   |   |   |   |
| Net                  increase (decrease)  in cash                                                                                                          |   |                                          | 391    |   |   |   | (648 | ) |
| Cash, beginning                  of period                                                                                                                      |   |                                          | 639    |   |   |   | 732 |   |
| Cash,                  end of period                                                                                                                                 |   | $                                             | 1,030  |   |   | $ | 84 |   |

*The      accompanying notes are an integral part of these financial      statements.*

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**RIDGEWOOD      ELECTRIC POWER TRUST      IV**

**NOTES      TO CONDENSED CONSOLIDATED FINANCIAL      STATEMENTS**

**(unaudited,      dollar amounts in      thousands)**

**1.   BASIS      OF PRESENTATION**

**2.   DESCRIPTION      OF BUSINESS**

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**RIDGEWOOD        ELECTRIC POWER TRUST        IV**

**NOTES        TO CONDENSED CONSOLIDATED FINANCIAL        STATEMENTS**

**(unaudited,        dollar amounts in        thousands)**

**3.                 NOTES RECEIVABLE,      AFFILIATES**

**4.                 INVESTMENTS**

**Maine      Hydro**

|                                                  |        | March                31, |
|-------------------------------------------------------|--------|--------------------------|
|                                                  |   | 2006                     |   |   | 2005 |   |
|                                                  |   |                     |   |   |   |   |
| Revenues                                              |   | $                        | 1,520 |   |   | $ | 1,181 |   |
|                                                  |   |                     |   |   |   |   |   |   |
| Gross                  profit                         |   |                     | 796 |   |   |   | 549 |   |
|                                                  |   |                     |   |   |   |   |   |   |
| Income                  from operations               |   |                     | 767 |   |   |   | 518 |   |
|                                                  |   |                     |   |   |   |   |   |   |
| Net                  income                           |   | $                        | 752 |   |   | $ | 452 |   |
|                                                  |   |                     |   |   |   |   |   |   |
| Trust                  share of income in Maine Hydro |   | $                        | 376 |   |   | $ | 226 |   |

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**RIDGEWOOD        ELECTRIC POWER TRUST        IV**

**NOTES        TO CONDENSED CONSOLIDATED FINANCIAL        STATEMENTS**

**(unaudited,        dollar amounts in        thousands)**

**Indeck      Maine**

|                                                          |   | March                31, |
|---------------------------------------------------------------|--------|--------------------------|
|                                                          |   | 2006                     |   |   | 2005 |   |
|                                                          |   |                     |   |   |   |   |
| Revenues                                                      |   | $                        | 8,346 |   |   | $ | 4,222 |   |
|                                                          |   |                     |   |   |   |   |   |   |
| Gross                  profit (loss)                          |   |                     | 842 |   |   |   | (766 | )  |
|                                                          |   |                     |   |   |   |   |   |   |
| Income                  (loss) from operations                |   |                     | 789 |   |   |   | (835 | )  |
|                                                          |   |                     |   |   |   |   |   |   |
| Net                  income (loss)                            |   | $                        | 412 |   |   | $ | (1,124 | ) |
|                                                          |   |                     |   |   |   |   |   |   |
| Trust                  share of income (loss) in Indeck Maine |   | $                        | 130 |   |   | $ | (560 | ) |

**5.    COMMITMENTS      AND CONTINGENCIES**

**6.   SUBSEQUENT      EVENTS**

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

**Forward-Looking      Statements**

**Critical      Accounting Policies and Estimates**

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**Results      of Operations and Changes in Financial Condition**

*Three      months ended March 31, 2006 compared to the three months ended March 31,      2005*

**Liquidity      and Capital Resources**

*Three      months ended March 31, 2006 compared to the three months ended March 31,      2005*

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**Future      Liquidity and Capital Resource Requirements**

**Off-Balance      Sheet Arrangements and Contractual Obligations and      Commitments**

**ITEM        3.   QUANTITATIVE AND QUALITATIVE DISCLOSURES        ABOUT 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. |
|--------|------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|   | · | Increased the number of degreed accountants. Additional                staff expansion is underway. |
|--------|--------|-----------------------------------------------------------------------------------------------------|

|   | · | Engaged                a national accounting firm to evaluate procedures and controls over                financial reporting. The firm made a report to the Managing Shareholder                in                May 2006, which has implemented some of the firm’s recommendations, and is                in the process of evaluating the remaining                recommendations. |
|--------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | In                August 2006, engaged a national accounting firm to supply accounting                personnel to assist while personnel hiring is underway. The work                performed                by the firm is under the direct supervision of the Trust’s Chief Financial                Officer and Controller. |
|--------|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | · | In                May 2007, the Trust appointed a new Chief Financial Officer who is                a                Certified Public Accountant with approximately 29 years of professional                accounting experience, including prior experiences as a financial                officer                of publicly traded companies. |
|--------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

**PART      II.   OTHER INFORMATION**

**ITEM      1.   LEGAL PROCEEDINGS**

**ITEM      1A.   RISK FACTORS**

**ITEM      2.   UNREGISTERED SALES OF EQUITY SECURITIES      AND USE OF PROCEEDS**

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**ITEM      3.   DEFAULTS UPON SENIOR      SECURITIES**

**ITEM      4.   SUBMISSION OF MATTERS TO A VOTE OF      SECURITY HOLDERS**

**ITEM      5.   OTHER INFORMATION**

**ITEM      6.   EXHIBITS**

|   | 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 the                Registrant. |

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**SIGNATURES**

|                                         | **RIDGEWOOD ELECTRIC                POWER TRUST IV** |
|----------------------------------------------|-----------------------------------------------------------|
|                                         |                                                      |   |
|                                         |                                                      |   |
| Date:                 November 27, 2007 | By:                                                       | /s/                 Randall D. Holmes |
|                                         |                                                      | Randall                D. Holmes |
|                                         |                                                      | Chief                Executive Officer |
|                                         |                                                      | (Principal                Executive Officer) |

|                                         |   |                                                                              |
|----------------------------------------------|--------|-----------------------------------------------------------------------------------|
| Date:                 November 27, 2007 | By:    | /s/                 Jeffrey H. Strasberg                                     |
|                                         |   | Jeffrey                H. Strasberg                                               |
|                                         |   | Executive                Vice President andChief                Financial Officer |
|                                         |   | (Principal                Financial and Accounting Officer)                       |

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