The Fed has been surprised with the degree to which "window dressing" activities' plays a role in money markets (see post). The demand for RRP at quarter-ends (paying 5 basis points on overnight money) has been higher than expected. The Fed ended up capping the overall size of the program to $300bn in order to avoid disrupting the repo markets.

Source: Deutsche Bank  (note that the decline between Q2-end and Q3-end has to do with the introduction of $300bn overall cap)

The point on window dressing was driven home at the end of September, when quarter-end driven demand for quality collateral resulted in over $400bn in RRP bids. The final transaction was executed at zero rate (as opposed to the usual 5bp). Participants were willing to park quarter-end overnight cash with the Fed for free (in fact the low bid was -20bp) in order to maximize riskless assets on their reported financials.

Source: NY Fed

This means that the year-end demand is likely to far exceed the $300bn currently made available. In December the Fed will therefore begin offering term reverse repo maturing around January-2. Doubling the availability over the turn will feed the repo markets, temporarily releasing $600bn of treasuries from the Fed's balance sheet.

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