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.
How Long Do Agencies Have to Keep Records? Q: How long do state agencies have to keep records? The Department of Fish and Game tells us they destroyed the records we wanted because they are over 4 years old. A: Nothing in the California Public Records Act (âPRAâ) addresses a local agencyâs obligation to retain records.