It’s a known issue that SCCM R3 Power Reporting will not run correct in some locale system. More specifically if the time format is not mm/dd/yyyy or the number format use ‘,’ instead of ‘.’ as the separator.
1. If you run the report in admin console, make sure the Formats setting in Control Panel -> Regional and Language Options are set to English (United States).
2. If you run the report in IE, make sure the Language Preference in IE->Tools->Internet Options->Languages is set to English (United States).