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 circumstances, as described in section 4.06 and section 5.02 of Notice 2013-29.

The Treasury Department and the IRS have published several notices further extending and modifying the Continuity Safe Harbor. Notice 2015-25 extended the Continuity Safe Harbor for one year by replacing "January 1, 2016" provided in Notice 2013-60 with "January 1, 2017." Notice 2016-31 modified the Continuity Safe Harbor originally provided in section 3.02 of Notice 2013-60 and extended by Notice 2015-25. Section 3 of Notice 2016-31 provides that if a taxpayer places a facility in service by the later of (1) a calendar year that is no more than four calendar years after the calendar year during which construction of the facility began or (2) December 31, 2016, the facility will be considered to satisfy the Continuity Safe Harbor. Notice 2017-04 further extended and modified the Continuity Safe Harbor by providing that if a taxpayer places a facility in service by the later of (1) a calendar year that is no more than four calendar years after the calendar year during which construction of the facility began or (2) December 31, 2018, the facility will be considered to satisfy the Continuity Safe Harbor.

Notice 2018-59 provides guidance on determining when construction has begun on energy property eligible for the § 48 credit. It provides two methods to establish the beginning of construction (Physical Work Test and Five Percent Safe Harbor), a Continuity Requirement for both methods, rules for transferring energy property, and additional rules applicable to the beginning of construction requirement of § 48 with respect to "energy property" described in sections 2.02 and 2.03 of Notice 2018-59. Section 6.05 of Notice 2018-59 provides a Continuity Safe Harbor for energy property under § 48 that mirrors that provided for the PTC under § 45 in the prior IRS notices: