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Oncor has already pushed a proposal in Texas that could further hurt generators like Energy Future’s Luminant unit.

It has talked to Tesla Motors about a $2 billion investment in stationary battery storage to solve the problem of fluctuating output from wind and solar sources. Integrating more renewable output into the grid could further depress prices in the already cheap Texas market, and that could hurt the bottom lines of generators that rely more heavily on higher prices amid anemic demand growth.