The estimated energy that can be recovered and utilized on the surface is 4.5 Ã 10 exajoules, or about 1.4 Ã 10 terawatt-years, which equates to roughly three times the worldâs annual consumption of all types of energy. The amount of usable energy from geothermal sources varies with depth and by extraction method.
1 Keep records for 7 years if you file a claim for a loss from worthless securities or bad debt deduction. 2  Keep records for 6 years if you do not report income that you should report, and it is more than 25% of the gross income shown on your return. 3  Keep records indefinitely if you do not file a return.
Most business owners donât know how long they should hold on to old records. According to the IRS, hereâs how long you should keep those records: Permanently: 1  general ledgers and journals. 2  payroll records, including W-2s, 940s, 941s. 3  year-end financial statements.4  tax returns and supporting documents. 5  articles of incorporation, bylaws, meeting minutes, etc. 6  retirement plan records.ost business owners donât know how long they should hold on to old records. According to the IRS, hereâs how long you should keep those records: Permanently: 1  general ledgers and journals. 2  payroll records, including W-2s, 940s, 941s. 3  year-end financial statements. 4  tax returns and supporting documents.