I'm looking at this group - being old ENE holder - I notice DUE...

I'm looking at this group - being old ENE holder - I notice DUE total debt is about the same as their market cap. Should this be a concern?
I guess interest rates are low at the moment, they have debt maturities as shown on slide 9 of their March 16 presentations - but I would imaging they will roll them over at low rates too.
Do all such utilities have such high debt?
I think they have long term contracts across all their operations - so they should have a stable and hopefully growing demand.

These would contribute to it be a safe bet?