No, nothing to do with some magic number like 49%.  Has ALL to do with $$$$$$.  Home & private business owned PV systems directly impact HECO's bottom line.   Homes on Oahu using air conditioning, washer/dryer, etc. can easily result in a $250 or more monthly bill. Central air doubles the cost.  With PV's installed on that home that can cover their electric use, including charging an electric vehicle, HECO only makes about $18 a month.  In PV farms using prime ag land, HECO hires a contractor to build and maintain the PV farm will pay the contractor around 11 cents/kwh and then resell that "free" electricity to Oahu user at the residential rate at about 28 center/kwh.  So with a PV farm controlled by HECO, they can double dip by not only charging home residents use of electricity, they will make a profit 50% profit on the generation of the "free" PV generated electricity since it does not require them to hire workers or pay to run & maintain a fossil fuel electric generator.