Not the only one having problems with this as keeps saying installation interrupted cancel or retry but now partly solved by installing missing dependencies as below then re-run "Install" in developer mode. Getting wake-up plug in error but functioning and reading 0.25W on mine. Sorry spent enough time on this for now but don't know whether order of installation makes a difference to result and too many possible permutations.

Presuming that you have Coderus Aegis-install hack package installed;
http://talk.maemo.org/showthread.php?t=90750

If you place any of armel.deb in home/user/MyDocs you would need to use aegis-dpkg -i filename to install after devel-su password cd /home/user/MyDocs

You can look for these upon Coderus's repository:
https://coderus.openrepos.net/n9mirror/tools/

libnep0_1.4.1+0m6_armel.deb (would install this first though)
energy-profiler_1.4.4+0m6_armel.deb
energy-profiler-server_1.3.0+0m6_armel.deb
energy-profiler-plugin-ram_1.3.0+0m6_armel.deb
energy-profiler-plugin-power_1.3.0+0m6_armel.deb
energy-profiler-plugin-net_1.3.0+0m6_armel.deb
energy-profiler-plugin-cpu_1.3.0+0m6_armel.deb


No point trying to install devtools-power_1.48+0m6_armel.deb by itself as doomed to failure.

Perhaps somebody else has better luck in getting no errors with this.